CN101366192A - Multi-band radio frequency modulator - Google Patents

Abstract

Techniques are described that allow operation according to two or more different communication modes in a single modulation path of a variable radio frequency (RF) modulator within a multi-mode wireless communication device (WCD). The multi-mode WCD may detect a service signal from a base station within a wireless communication system and select a communication mode in which to operate based on the communication mode of the detected service signal. The techniques described herein enable a digital controller within the RF modulator to set parameters of variable components along the single modulation path of the RF modulator based on the selected communication mode. In this way, the single modulation path of the variable RF modulator may be set to process a baseband signal from a user of the WCD according to the communication mode in which the multi-mode WCD is operating.

Description

Multi-band radio frequency modulator

The application's case is advocated the benefit of priority based on the 60/716th, No. 537 U.S. Provisional Application case of application on September 12nd, 2005.

Technical field

The present invention relates to radio communication, and more particularly relate to radio frequency (RF) modulator in the radio communication device.

Background technology

Various wireless communication technologys have been developed to promote aerogram, comprising frequency division multiple access (FDMA), time division multiple access (TDMA) and various spread spectrum technique.A kind of common spread spectrum technique that uses in the radio communication is the modulation of code division multiple access (CDMA) signal, wherein transmits a plurality of communications simultaneously via spread-spectrum radio frequency (RF) signal.Some mobile communication protocols use the modulation of CDMA signal, for example CDMA series standard and wideband CDMA (WCDMA) series standard.

FDMA is meant that the spectrum division of will distribute becomes the wireless communication technology of a plurality of less frequency cells.Each sub-district of the frequency spectrum of described distribution has the data available modulated carrier signal.TDMA is meant the wireless communication technology that frequency cells is divided into time slot.In the system that implements the TDMA technology, during particular time-slot, send different radio communications, and in some cases, time slot allocation can be used for based on the communication of reserving.By ETSI (ETSI) standardized global system for mobile communications (GSM) standard and edge GSM (eGSM) standard is to utilize the example of the system of FDMA and TDMA technology.Universal Mobile Telecommunications System (UMTS) standard is permitted GSM or CDMA operation.

In the present invention, radio communication device (WCD) is meant any device that can modulate wireless signal.Some exemplary WCD comprise honeycomb fashion or satellite radio telephone, radio phone base station, support the computer of one or more Wireless Networking standards, be used for Wireless Networking WAP (wireless access point), be incorporated in pcmcia card, direct and two-way communicator in the portable computer, be equipped with the PDA(Personal Digital Assistant) of wireless communication ability etc.

In aerogram, the sender device modulation intelligence is to create one or more baseband waveforms or baseband signal.Then can in the frequency up-converted process, baseband waveform be mixed with carrier wave.Sender device then can be transferred to acceptor device with wireless mode with the signal that is mixed.Acceptor device is removed carrier wave to obtain baseband waveform from received signal in the frequency down-converts process.Acceptor device then can be carried out the demodulation to baseband waveform, to obtain modulated information.

The multi-mode WCD that can meet the UMTS standard comprises the different modulating path at different communication modes (for example GSM and CDMA), because different communication modes has different Considerations.For instance, the key parameter that is used for baseband waveform in the gsm communication pattern in the modulator comprises that receiver band noise, image under carrier suppressed, the bigger skew suppress and the group delay coupling.On the other hand, the key parameter that is used for baseband waveform in the cdma communication pattern in the modulator comprises the carrier suppressed under gain control range, emission maximum device power output and the minimum reflector power output.

Summary of the invention

In general, present invention is directed at the technology of operating according to two or more different communication modes in the single modulation path of variable radio frequency (RF) modulator of permission in multimode wireless communication apparatus (WCD).Multi-mode WCD is supported under two or more different communication modes and operates.Multi-mode WCD can detect the service signal from the base station in the wireless communication system, and selects communication pattern in order to operation based on the communication pattern of the service signal that is detected.Technology described herein makes multi-mode WCD that the parameter (for example, gain, bandwidth, bias current, bias voltage and sharing model voltage) of the variable component in the radio frequency modulator can be set based on selected communication pattern.In this way, the single modulation path of the variable radio frequency modulator of communication pattern that can just operate according to multi-mode WCD is set to handle the audio or video signal from the user of WCD.

Multi-mode WCD can comprise travelling carriage modulator-demodulator (MSM), and the communication pattern of its definite service signal that is detected is also selected in order to operate the equivalent communication mode of multi-mode WD.For instance, service signal can meet one in code division multiple access (CDMA) communication pattern, global system for mobile communications (GSM) communication pattern or another communication pattern.In addition, described MSM can determine the frequency band of selected communication pattern based on the frequency band that the service signal that is detected is just being operated.For instance, service signal can be operated in one in high frequency band of communication pattern (for example, 1700 to 2100MHz) or the low-frequency band (for example, 824 to 915MHz).

MSM determines the parameter and the power output of the frequency band of selected communication pattern.Digitial controller in the variable radio frequency modulator uses the determined parameter from MSM to be provided with along the variable component of the single modulation path of variable radio frequency modulator.In some cases, digitial controller only is provided with the variable component that is associated with the frequency band of selected communication pattern.Variable radio frequency modulator is followed the process user signal, and digitial controller is selected the output port of variable radio frequency modulator based on selected communication pattern.Variable radio frequency modulator sends to treated subscriber signal the reflector that is included among the multi-mode WCD with the enough gains and the power output of the frequency band of selected communication pattern via selected output port.Technology described herein can be by avoiding comprising that independent modulation path reduces the cost of making the radio frequency modulator in the multi-mode WCD at each communication pattern that multi-mode WCD is supported.

In one embodiment, the invention provides a kind of method, it is included in described two or more communication patterns of operation in the single modulation path of variable radio frequency modulator included among the multi-mode WCD that supports two or more communication patterns.Described method also comprises by based on the parameter of the selected settings in described two or more communication patterns along the variable component of the single modulation path of variable radio frequency modulator, comes according to described selected one signals of handling from the user of WCD in the described communication pattern.

In another embodiment, the invention provides a kind of computer-readable media that comprises instruction.Described instruction causes described two or more communication patterns of operation in the single modulation path of programmable processor included variable radio frequency modulator in supporting the multi-mode WCD of two or more communication patterns.Described instruction further causes described programmable processor by based on the parameter of the selected settings in described two or more communication patterns along the variable component of the single modulation path of variable radio frequency modulator, comes according to described selected one signals of handling from the user of WCD in the described communication pattern.

In another embodiment, the invention provides a kind of multi-mode WCD that supports two or more communication patterns, it comprises variable radio frequency modulator, and described variable radio frequency modulator is operated described two or more communication patterns in the single modulation path of described variable radio frequency modulator.Variable radio frequency modulator comes according to described selected one signals of handling from the user of multi-mode WCD in the described communication pattern by based on the parameter of the selected settings in described two or more communication patterns along the variable component of the single modulation path of variable radio frequency modulator.

In another embodiment, the invention provides a kind of method, it comprises based on the service signal that is detected selects in order to move the communication pattern of multi-mode WCD, determine parameter and power output and based on the parameter of determined parameter setting at the frequency band of selected communication pattern along the variable component of the single modulation path of variable radio frequency modulator.Described method also comprises according to selected communication pattern handles signal from the user of multi-mode WCD with variable radio frequency modulator.

In another embodiment, the invention provides a kind of computer-readable media that comprises instruction.Described instruction causes programmable processor to be selected in order to move the communication pattern of multi-mode WCD based on the service signal that is detected, determine parameter and power output at the frequency band of selected communication pattern, and based on the parameter of determined parameter setting along the variable component of the single modulation path of variable radio frequency modulator.Described instruction further causes described programmable processor to handle signal from the user of multi-mode WCD according to selected communication with variable radio frequency modulator.

In another embodiment, the invention provides a kind of multi-mode WCD, it comprises receiver, MSM and the variable radio frequency modulator that detects service signal.Described MSM selects communication pattern in order to operation multi-mode WCD based on the service signal that detected, and determines parameter and power output at the frequency band of selected communication pattern.Variable radio frequency modulator comprises digitial controller, and it is provided with along the parameter of the variable component of the single modulation path of variable radio frequency modulator based on the determined parameter from MSM.Variable radio frequency modulator is according to the signal of selected communication process from the user of WCD.

Technology described herein can be implemented in hardware, software, firmware or its any combination.If implement in software, so described technology can be all or part of realizes by the computer-readable media that comprises instruction, and one or more in the method described herein are carried out in described instruction when being carried out by processor.

State the details of one or more embodiment in the accompanying drawings and the description below.From describe content and accompanying drawing and claims, will understand other features, objects and advantages of the present invention.

Description of drawings

Fig. 1 is the block diagram that explanation comprises the wireless communication system of multi-mode WCD, the technology of operating according to two or more different communication modes in the single modulation path of the variable radio frequency modulator of described multi-mode WCD enforcement permission in multi-mode WCD.

Fig. 2 is described in more detail from the travelling carriage modulator-demodulator of Fig. 1 and the block diagram of variable radio frequency modulator.

Fig. 3 is that explanation is according to the flow chart of the communication pattern of selecting at multi-mode WCD with the example operation of the single modulation path processing signals of variable radio frequency modulator included among the described multi-mode WCD.

Fig. 4 is described in more detail the variable radio frequency modulator from Fig. 2.

Fig. 5 explanation is from the one exemplary embodiment of the digitial controller of Fig. 4.

Fig. 6 explanation is from the one exemplary embodiment of the frequency up converters of Fig. 4.

Fig. 7 explanation is from another one exemplary embodiment of the frequency up converters of Fig. 4.

Fig. 8 illustrates the one exemplary embodiment of the LO buffer of the intrasystem driving of LO RF blender.

Fig. 9 explanation is from the low strap LO buffer of Fig. 4 or any one the one exemplary embodiment in the high-band LO buffer.

Figure 10 explanation is from the one exemplary embodiment of the harmonic supression filter (harmonic reject filter) of Fig. 4.

Figure 11 explanation is from the one exemplary embodiment of the RF VGA of Fig. 4.

Figure 12 explanation is from the one exemplary embodiment of the driver amplifier of Fig. 4.

Figure 13 explanation provides the one exemplary embodiment of the driver amplifier biasing circuit of biasing input current from Figure 10's to the driver amplifier.

Embodiment

Fig. 1 is the block diagram that explanation comprises the wireless communication system 10 of multimode wireless communication apparatus (WCD) 14, the technology of operating according to two or more different communication modes in the single modulation path of variable radio frequency (RF) modulator 22 of described multi-mode WCD 14 enforcement permissions in multi-mode WCD 14.Multi-mode WCD 14 is supported in two or more different communication modes and operates, and described communication pattern for example is code division multiple access (CDMA) communication pattern, global system for mobile communications (GSM) communication pattern or other communication pattern.This may be particularly useful at whilst on tour, because country variant may provide the wireless communications environment that meets the different wireless communication standard.For instance, most of wireless communications environments of providing of the U.S. meet CDMA series standard or wideband CDMA (WCDMA) series standard.On the other hand, most of wireless communications environments of providing of Europe meet GSM standard or edge GSM (eGSM) standard.

System 10 can be through design to support one or more wireless communication technologys, for example CDMA, frequency division multiple access (FDMA) or time division multiple access (TDMA).Can provide above wireless communication technology according in the multiple radio access technologies any one.For instance, can provide CDMA according to CDMA series standard (comprising cdma2000) or WCDMA series standard.Can provide FDMA and TDMA according to GSM standard or eGSM standard.Universal Mobile Telecommunications System (UMTS) standard is permitted GSM or CDMA operation.This paper will describe the application to the UMTS environment for purposes of illustration.For instance, system 10 especially can be used for CDMA or the gsm communication in the UMTS environment, but should not think that its application is limited to various wireless communications environments.

Wireless communication system 10 comprises a plurality of base station 12A to 12C (" base station 12 "), and it is communicated by letter with multi-mode WCD 14.Though a multi-mode WCD 14 only is described, system 10 can comprise a plurality of multi-mode WCD and/or monotype WCD.Multi-mode WCD 14 can adopt mobile radiotelephone, satellite radio telephone, be incorporated in wireless communication card in the portable computer, be equipped with the form of the PDA(Personal Digital Assistant) etc. of wireless communication ability.Normally communicate by letter so that be provided to the permanent plant of the network insertion of multi-mode WCD 14 with multi-mode WCD 14 with wireless mode in base station 12.For instance, base station 12 can provide the interface between multi-mode WCD 14 and the public switched telephone network (PSTN), makes call to be routed to multi-mode WCD 14 and to call out from multi-mode WCD 14 routing telephones.Perhaps or in addition, base station 12 can be coupled to based on the network of bag to be used to transmit based on the voice messaging of bag or based on the data of bag.Base station 12 is sometimes referred to as base transceiver systems (BTS).

Multi-mode WCD 14 comprises antenna 18, receiver/transmitter 20, variable radio frequency modulator 22 and travelling carriage modulator-demodulator (MSM) 24.Receiver/transmitter 20 12 receives wireless signal 16A to 16C (" signal 16 ") via antenna 18 from the base station.Multi-mode WCD 14 communicates with one or more base stations 12 simultaneously.Along with multi-mode WCD14 moves through a district, it can use a succession of soft hard handoff to switch to stop and communicating by letter of a base station 12 and communicating by letter of initial and another base station 12 based on signal strength signal intensity or error rate.

Multi-mode WCD 14 can search for the service signal from its base station 12 will operating in the base station 12 in the above.For instance, receiver/transmitter 20 can send a succession of CDMA service request via antenna 18 at first on a plurality of frequency bands, to attempt one obtaining CDMA service from base station 12.Service signal can the high frequency band of cdma communication pattern (for example, 1900 or 2100MHz) or low-frequency band (that is, 850MHz) in operation.If do not detect the CDMA service signal, receiver/transmitter 20 then can send a succession of GSM service request via antenna 18 on a plurality of frequency bands so, to attempt one obtaining GSM service from base station 12.Service signal can be in the high frequency band (that is, 1800 to 1900MHz) or the interior operation of low-frequency band (for example, 850 to 900MHz) of gsm communication pattern.

In case receive service signal (for example, one in the signal 16) via antenna 18, receiver/transmitter 20 just sends to MSM 24 with described service signal.The communication pattern of MSM 24 definite service signals that detected is also selected in order to operate the equivalent communication mode of multi-mode WCD 14.The frequency band that MSM 24 is also just operating based on the service signal that is detected is determined the frequency band of selected communication pattern.MSM 24 then determines parameter and power output at the frequency band of described communication pattern, and determined parameter is sent to variable radio frequency modulator 22.Described parameter can comprise one or more in gain, bandwidth, bias current, bias voltage and the sharing model voltage.MSM 24 also will send to radio frequency modulator 22 from the user's of WCD 14 signal (for example, audio or video signal).

Variable radio frequency modulator 22 is implemented the technology that permission is operated according to two or more different communication modes in the single modulation path of variable radio frequency modulator 22.Described technology makes the digitial controllers in the variable radio frequency modulator 22 to be provided with along the parameter of the variable component of the single modulation path of radio frequency modulator 22 based on the communication pattern of being selected by MSM 24.For purposes of illustration, variable radio frequency modulator 22 is described as the CDMA modulation path of variable radio frequency modulator 22 is configured to support the gsm communication pattern in this article.In other embodiments, two above communication patterns or different communication modes can be configured to operate in the single modulation path of variable radio frequency modulator 22.Technology described herein can be by avoiding comprising that independent modulation path reduces the cost of making the radio frequency modulator in the multi-mode WCD at each communication pattern that multi-mode WCD is supported.

Digitial controller in the variable radio frequency modulator 22 uses the determined parameter from MSM 24 to be provided with along the variable component of the single modulation path of variable radio frequency modulator 22.In some cases, digitial controller can only be provided with those variable component that are associated with the frequency band of selected communication pattern.Variable radio frequency modulator 22 then can come according to the communication pattern that multi-mode WCD 14 is just operating with the signal of single modulation path processing from the user of multi-mode WCD 14.Be included in digitial controller in the variable radio frequency modulator 22 and select the output port of variable radio frequency modulator 22 based on selected communication pattern.Variable radio frequency modulator then sends to receiver/transmitter 20 with treated signal from variable radio frequency modulator via selected output port with enough gains and power output at the frequency band of selected communication pattern.Receiver/transmitter 20 then transmits described treated signal.

Fig. 2 is described in more detail from the travelling carriage modulator-demodulator 24 of Fig. 1 and the block diagram of variable radio frequency modulator 22.MSM 24 selects in order to operate the communication pattern of multi-mode WCD 14 based on the communication pattern of the service signal that is detected.For instance, MSM 24 can select one in cdma communication pattern, gsm communication pattern or another communication pattern.In addition, MSM 24 determines the frequency band of selected communication pattern based on the frequency band of just operating before the service signal that is detected.

In the illustrated embodiment, MSM 24 comprises power controller 30, serial bus interface (SBI) 32, potential pulse density modulation device (PDM) 34, digital amplifier 36 and digital-analog convertor (DAC) 38.Power controller 30 is determined parameter and power output at the frequency band of selected communication pattern.Power controller 30 then sends to the external power amplifier 52 that is connected to variable radio frequency modulator 22 with determined power output.Power controller 30 sends to digital amplifier 36 and voltage PDM 34 or SBI 32 with determined parameter.Among voltage PDM 34 or the SBI 32 one then sends to variable radio frequency modulator 22 with output.

The digital baseband subscriber signal (for example, video or audio signal) that determined gain in digital amplifier 36 operation parameters is amplified or decayed and receive from the user of multi-mode WCD 14.The digital baseband subscriber signal can comprise base band homophase differential (that is, add and subtract) signal (I, I) and base band quadrature differential wave (Q, Q), described base band quadrature differential wave is spent with described homophase differential wave skew 90.DAC 38 then is converted to analog baseband signal with digital baseband signal.DAC 38 sends to variable radio frequency modulator 22 with analog baseband signal.

Variable radio frequency modulator 22 comprises digitial controller 40, reference current 41, local oscillator (LO) system 42, frequency up converters 44, RF variable gain amplifier (VGA) 48 and driver amplifier 50.Frequency up converters 44 comprises baseband filter 45, base band VGA 46 and RF blender 47.In each of RF blender 47, RF VGA 48 and driver amplifier 50 one can be associated with the high frequency band (for example, 1700 to 2100MHz) of selected communication pattern.Another person in each of RF blender 47, RF VGA 48 and driver amplifier 50 can be associated with the low-frequency band (for example, 824 to 915MHz) of selected communication pattern.In other embodiments, the variable component that is associated with higher or lower frequency band or different frequency bands can be included in the variable radio frequency modulator 22.

Digitial controller 40 receives the output of a voltage PDM 34 or the output of SBI 32 at determined parameter.Digitial controller 40 can comprise that look-up table or another device are to be used for based on the gain control signal of determined parameter generating at the variable component in the variable radio frequency modulator 22.In the illustrated embodiment, variable component comprises baseband filter 45, base band VGA46, RF VGA 48 and driver amplifier 50.Digitial controller 40 uses the determined parameter from MSM 24 that each parameter (for example gain, bandwidth, bias current, bias voltage and sharing model voltage) in the variable component of the single modulation path of variable radio frequency modulator 22 is set, to come the treatment of simulated baseband signal according to selected communication pattern.In some cases, the parameter of one in one and the driver amplifier 50 among the RF VGA 48 that digitial controller 40 only is provided with the frequency band of selected communication pattern is associated.

Digitial controller 40 is provided with reference current 41 (Iref) based on the desired parameters setting at the baseband filter 45 in the frequency up converters 44.Reference current 41 is fed into again among the DAC 38 in the MSM 24, and the parameter of baseband filter 45 is set via DAC 38.Digitial controller 40 is based on one the parameter that is associated with the frequency band of selected communication pattern that is provided with at each the desired parameters in variable component 46,48 and 50 in one and the driver amplifier 50 that are associated with the frequency band of selected communication pattern that directly is provided with among base band VGA 46, the RF VGA 48.

This paper will distribute referring to the gain controlling that Fig. 2 describes at multi-mode WCD 14.In the cdma communication pattern is under the situation of selected communication pattern, and the gain controlling of 118 dB is possible altogether.The gain controlling of described 118 dB comprises the gain controlling of the optional 12dB that is used for external power amplifier 52.Variable radio frequency modulator 22 can provide the gain controlling of 94dB.For instance, the gain of being determined by the power controller 30 that is included among the MSM 24 can provide to the gain controlling that reaches 12dB to digital amplifier 36.In addition, digitial controller 40 can be to reference current 41 and is provided to the gain controlling that reaches 20dB to baseband filter 45 again.In addition, digitial controller 40 also can provide to the gain controlling that reaches 18dB to base band VGA 46, provides to the gain controlling that reaches 24dB to RF VGA 48, and provides to the gain controlling that reaches 32dB to driver amplifier 50.In the gsm communication pattern is under the situation of selected communication pattern, can determine that similar gain controlling distributes.

Fig. 3 is that explanation is according to the flow chart of the communication pattern of selecting at multi-mode WCD with the example operation of the single modulation path processing signals of variable radio frequency modulator included among the described multi-mode WCD.This paper will be with reference to operation as described in describing as the MSM 24 in the multi-mode WCD illustrated in fig. 2 14 and variable radio frequency modulator 22.MSM 24 detects the service signal from base station (for example from one in the base station 12 of Fig. 1), and selects communication pattern (56) in order to operation multi-mode WCD 14 based on the communication pattern of the service signal that is detected.

For instance, MSM 24 can detect the service signal that meets cdma communication pattern, gsm communication pattern or another communication pattern.In addition, MSM 24 can determine the frequency band of selected communication pattern based on the frequency band that the service signal that is detected is just being operated.For instance, the service signal that is detected can be operated in one in high frequency band of described communication pattern (for example, 1700 to 2100MHz) or the low-frequency band (for example, 824 to 915MHz).As an example, the high frequency band of CDMA pattern is about 1900 or 2100MHz, and the low-frequency band of CDMA pattern is about 850MHz.The high frequency band of GSM pattern is between about 1800 to 1900MHz, and the low-frequency band of GSM is between about 850 to 900MHz.Certainly, described herein constructedly also can work with other communication pattern of in other frequency band, operating.

Power controller 30 in the MSM 24 is determined necessary parameter of transmission signals in the frequency band of selected communication pattern (for example gain, bandwidth, bias current, bias voltage and sharing model voltage) and power output (58).Power controller 30 then sends to one among digital amplifier 36 and voltage PDM 34 or the SBI 32 with determined parameter.Power controller 30 sends to determined power output the external power amplifier 52 that is connected to variable radio frequency modulator 22.Among SBI 32 or the voltage PDM 34 one then sends to determined parameter the digitial controller 40 (60) in the variable radio frequency modulator 22.

MSM 24 also can receive digital baseband signal for transmission from the user of multi-mode WCD 14.The digital baseband subscriber signal can comprise base band homophase differential wave and base band quadrature differential wave.Digital amplifier 36 is based on the described digital baseband signal that amplifies or decay from included gain in the determined parameter of power controller 30.DAC 38 then is converted to analog baseband signal with digital baseband signal, and described analog baseband signal is sent to frequency up converters 44 (62) in the variable radio frequency modulator 22.

Digitial controller 40 receives at the output of the voltage PDM 34 of determined parameter and the output of SBI 32.Digitial controller 40 can comprise that look-up table or another device are to be used for based on the gain control signal of determined parameter generating at the variable component in the variable radio frequency modulator 22.In the illustrated embodiment, variable component comprises baseband filter 45, base band VGA 46, RF VGA 48 and driver amplifier 50.Digitial controller 40 is provided with each parameter in the variable component of the single modulation path of variable radio frequency modulator 22 based on the determined parameter from MSM 24, to come treatment of simulated baseband signal (64) according to selected communication pattern.In some cases, the parameter of one in one and the driver amplifier 50 among the RF VGA 48 that digitial controller 40 only is provided with the frequency band of selected communication pattern is associated.

Digitial controller 40 is provided with reference current 41 (Iref) based on the desired parameters setting at the baseband filter 45 in the frequency up converters 44.Reference current 41 is fed into again among the DAC 38 in the MSM 24, and the parameter of baseband filter 45 is set via DAC 38.Digitial controller 40 is based on one the parameter that is associated with the frequency band of selected communication pattern that is provided with at each the desired parameters in variable component 46,48 and 50 in one and the driver amplifier 50 that are associated with the frequency band of selected communication pattern that directly is provided with among base band VGA 46, the RF VGA 48.

Baseband filter 45 carries out low-pass filtering (66) based on the parameter that is provided with indirectly by digitial controller 40 to the analog baseband signal that receives from DAC 38.Base band VGA 46 then amplifies or the analog baseband signal of decaying (68) based on the gain that is provided with by digitial controller 40, to produce the simulation intermediate frequency signal.What in the RF blender 47 and frequency band selected communication band (for example, high frequency band or low-frequency band) were associated one receives from the simulation intermediate frequency signal of base band VGA 46 and from the RF signal of LO system 42.LO system 42 comprises the LO buffer, its by only in RF blender 47 be associated with frequency band selected communication pattern one provide RF homophase and quadrature differential wave to drive described one in the RF blender 47.In the RF blender 47 be associated with frequency band selected communication pattern described one then produce RF signal (70) according to described simulation intermediate frequency signal.

Among the RF VGA 48 described one amplifies based on the gain that is provided with by digitial controller 40 or decays from the RF signal (72) of described one in the RF blender 47.In the driver amplifier 50 described one amplifies based on the gain that is provided with by digitial controller 40 or decays from the RF signal (74) of described one among the RF VGA 48.Digitial controller 40 is then selected the output port (76) of described one in the driver amplifier 50 based on selected communication pattern.In the driver amplifier 50 described one then sends to receiver/transmitter 20 (78) with the RF signal from variable radio frequency modulator 22 via selected output port with enough gains and power output at the frequency band of selected communication pattern.In the illustrated embodiment of Fig. 2, in the driver amplifier 50 described one at first sends to power amplifier 52 with the RF signal, described power amplifier 52 is based on the RF signal that amplifies or decay from the determined power output of power controller 30, and power amplifier 52 then sends to receiver/transmitter 20 with the RF signal.

Fig. 4 is described in more detail the variable radio frequency modulator 22 from Fig. 2.Variable radio frequency modulator 22 receives the baseband analog subscriber signal from MSM 24.In the embodiment of Fig. 4 explanation, the baseband analog subscriber signal comprises base band homophase differential wave, and (I, I) (Q, Q), described base band quadrature differential wave and described homophase differential wave skew 90 are spent with base band quadrature differential wave.

As indicated above, digitial controller 40 receives determined parameter from MSM 24.Digitial controller 40 can comprise that look-up table or another device are to be used for based on the gain control signal of determined parameter generating at the variable component in the variable radio frequency modulator 22.In Fig. 4, variable component comprises baseband filter 45, base band VGA 46, RF VGA 48 and driver amplifier 50.Digitial controller 40 uses the determined parameter from MSM 24 that each parameter in the variable component of the single modulation path of variable radio frequency modulator 22 is set, to come the treatment of simulated baseband signal according to selected communication pattern.In some cases, the parameter of one in one and the driver amplifier 50 among the RF VGA 48 that digitial controller 40 only is provided with the frequency band of selected communication pattern is associated.

In the example of Fig. 4, all aspects of variable radio frequency modulator 22 (comprising that mode switch, power descend and gain controlling) all are in digital control time via the SBI 32 of MSM 24.Gain controlling in the multi-mode WCD 14 that operates in the cdma communication pattern is carried out in discrete step.For instance, the gain controlling via reference current 41, base band VGA 46, RF VGA 48 and driver amplifier 50 is made of 256 discrete steps in the baseband filter 45.8 analogue-to-digital converters that digitial controller 40 usefulness are taken a sample to the aanalogvoltage that receives from voltage PDM 34, or, come at each the generation internal gain control signal in the variable component in the variable radio frequency modulator 22 by directly receiving through 1 signal of pulse density modulation and be 8 signals with described 1 conversion of signals via the transmission of PDM voltage being passed digital filter from voltage PDM 34.The output of analogue-to-digital converters or digital filter is applied to look-up table, and described look-up table is the linear gain controlling features of unit at providing with db along each of the variable component of the single modulation path of variable radio frequency modulator 22.Before the burst of each time slot gain controlling and filter bandwidht in the multi-mode WCD 14 that operates under the gsm communication pattern are being programmed.The initiating terminal of the transition indication time slot of RF signal.Transition also loads different gain and filter bandwidht setting at each time slot.

Frequency up converters 44 comprises homophase baseband filter 45A, orthogonal basis band filter 45B, homophase base band VGA46A, quadrature base band VGA 46B, low strap RF blender 47A and high-band RF blender 47B.In the illustrated embodiment of Fig. 4, baseband filter 45A, 45B comprise low pass filter.Input buffer (not shown) receives baseband I and Q differential wave from MSM 24, and described baseband I differential wave is applied to baseband filter 45A and described base band Q differential wave is applied to baseband filter 45B.Baseband filter 45A and 45B can be based on by coming that from the parameter of the gain control signal setting that is used for baseband filter of digitial controller 40 base band differential wave is separately carried out low-pass filtering.

Homophase baseband filter 45A then will be applied to homophase base band VGA 46A through the baseband I differential wave of filtering, and orthogonal basis band filter 45B will be applied to quadrature base band VGA 46B through the base band Q of filtering differential wave.Base band VGA46A and 46B are based on by the filtered baseband differential wave of respectively hanging oneself of amplifying or decay from the gain of the gain control signal setting that is used for base band VGA of digitial controller 40.In this way, base band VGA 46A and 46B produce the intermediate frequency differential wave according to the base band differential wave through filtering.

Homophase base band VGA 46A with intermediate frequency I differential wave output among low strap RF blender 47A and the high-band RF blender 47B be associated with the frequency band of selected communication pattern one.Quadrature base band VGA 46B also intermediate frequency Q differential wave is outputed among low strap RF blender 47A and the high-band RF blender 47B be associated with the frequency band of selected communication pattern one.For instance, if MSM 24 determines that (for example, CDMA or GSM) frequency band comprises low-frequency band (for example, 824 to 915MHz) to selected communication patterns, and base band VGA 46A and 46B will output to low strap RF blender 47A to intermediate frequency differential wave separately so.In addition, if MSM 24 determines that (for example, CDMA or GSM) frequency band comprises high frequency band (for example, 1700 to 2100MHz) to selected communication patterns, and base band VGA 46A and 46B will output to high-band RF blender 47B to intermediate frequency differential wave separately so.

LO system 42 comprises phase-locked loop (PLL) 86 and oscillator 87, the differential RF LO signal of described oscillator 87 output frequencies between about 3.2GHz and 4GHz.LO system 42 also comprises according to the output of oscillator 87 and produces four frequency division modules 88 of low band signal and produce the two divided-frequency module 92 of high-frequency band signals according to the output of oscillator 87.For instance, four frequency division modules 88 produce the differential RF LO signal of frequency between about 800MHz and 1000MHz.Two divided-frequency module 92 produces the differential RF LO signal of frequency between about 1600MHz and 2000MHz.The differential RF LO signal damping of LO buffer (not shown) in the LO system 42 by self-oscillation in future device 87 to four frequency division modules 88 that are used for low-frequency band or the two divided-frequency module 92 that is used for high frequency band drive RF blender 47A, 47B be associated with frequency band selected communication pattern one.

Cushion by low strap homophase LO buffer 89 and low strap quadrature LO buffer 90 from the low-frequency band differential wave of four frequency division modules, 88 outputs. Low strap buffer 89 and 90 with its separately RF signal output send to low strap RF blender 47A in the frequency up converters 44.Cushion by high-band homophase LO buffer 93 and high-band quadrature LO buffer 94 from the high frequency band differential wave of two divided-frequency module 92 outputs.High- band buffer 93 and 94 with its separately RF signal output send to high-band RF blender 47B in the frequency up converters 44.

Low strap RF blender 47A comprises in-phase multiplier 80, quadrature multiplier 81 and adder 82.Frequency band at selected communication pattern is under the situation of low-frequency band, and in-phase multiplier 80 receives from the intermediate frequency I differential wave of homophase base band VGA 46A with from the RF I differential wave of low strap homophase LO buffer 89.Quadrature multiplier 81 receives from the intermediate frequency Q differential wave of quadrature base band VGA 46B with from the RF Q differential wave of low strap quadrature LO buffer 90. Multiplier 80 and 81 produces the RF differential wave, and described RF differential wave is by adder 82 summations and send to harmonic supression filter 95.

Harmonic supression filter 95 suppresses the 3rd and high-order harmonic wave more from the RF differential wave of low strap RF blender 47A.If do not comprise harmonic supression filter 95 in the frequency up converters 44, the harmonic wave of RF differential wave will be owing to the cause of the third-order non-linear among the low tape drive amplifier 50A mixes with the fundamental frequency of RF differential wave among the low tape drive amplifier 50A so.Third-order non-linear makes the adjacent channel leak rate degradation of reflector 20.The adjacent channel leak rate of reflector 20 is good more, and the power disturbance that reflector 20 produces in adjacent channel is just few more.Harmonic supression filter 95 then will send to low strap RF VGA 48A through the RF of filtering differential wave.

Low strap RF VGA 48A is based on by amplifying from the gain that is used for one the gain control signal setting that is associated with frequency band selected communication pattern RF VGA of digitial controller 40 or decaying from the RF differential wave of low strap RF blender 47A output.Low strap RF VGA 48A then produces single RF signal by transformer 96 is passed in the transmission of RF differential wave.Low tape drive amplifier 50A is based on by amplifying from the gain that is used for one the gain control signal setting that is associated with frequency band selected communication pattern the driver amplifier of digitial controller 40 or decaying from the RF signal of low strap RF VGA 48A.

Low tape drive amplifier 50A comprises cdma communication pattern output port 97 and gsm communication pattern output port 98.Digitial controller 40 is based on one in the output port 97 and 98 of being selected low tape drive amplifier 50A by the communication pattern in order to operation multi-mode WCD 14 of MSM 24 selections.Comprise at selected communication pattern under the situation of cdma communication pattern, digitial controller 40 is selected the CDMA output port 97 of low tape drive amplifier 50A, described CDMA output port 97 (for example, 850MHz) provides enough gain and power outputs to the low-frequency band of selected cdma communication pattern.Comprise at selected communication pattern under the situation of gsm communication pattern, digitial controller 40 is selected the GSM output port 98 of low tape drive amplifier 50A, described GSM output port 98 provides enough gain and power outputs to the low-frequency band (for example, 850 to 900MHz) of selected gsm communication pattern.

High-band RF blender 47B comprises in-phase multiplier 83, quadrature multiplier 84 and adder 85.Frequency band at selected communication pattern is under the situation of high frequency band, and in-phase multiplier 83 receives from the intermediate frequency I differential wave of homophase base band VGA 46A with from the RF I differential wave of high-band homophase LO buffer 93.Quadrature multiplier 84 receives from the intermediate frequency Q differential wave of quadrature base band VGA 46B with from the RF Q differential wave of high-band quadrature LO buffer 94. Multiplier 83 and 84 produces the RF differential wave, and described RF differential wave is by adder 85 summations and send to harmonic supression filter 99.

Harmonic supression filter 99 suppresses the 3rd and high-order harmonic wave more from the RF differential wave of high-band RF blender 47B.If do not comprise harmonic supression filter 99 in the frequency up converters 44, the harmonic wave of RF differential wave will be owing to the cause of the third-order non-linear among the low tape drive amplifier 50B mixes with the fundamental frequency of RF differential wave among the high tape drive amplifier 50B so.Third-order non-linear makes the adjacent channel leak rate degradation of reflector 20.The adjacent channel leak rate of reflector 20 is good more, and the power disturbance that reflector 20 produces in adjacent channel is just few more.Harmonic supression filter 99 then will send to high-band RF VGA 48B through the RF of filtering differential wave.

High-band RF VGA 48B is based on by amplifying from the gain that is used for one the gain control signal setting that is associated with frequency band selected communication pattern RF VGA of digitial controller 40 or decaying from the RF differential wave of high-band RF blender 47B output.High-band RF VGA 48B then produces single RF signal by transformer 100 is passed in the transmission of RF differential wave.High tape drive amplifier 50B is based on by amplifying from the gain that is used for one the gain control signal setting that is associated with frequency band selected communication pattern the driver amplifier of digitial controller 40 or decaying from the RF signal of high-band RF VGA 48B.

High tape drive amplifier 50B comprises cdma communication pattern output port 101 and gsm communication pattern output port 102.Digitial controller 40 is based on one in the output port 101 and 102 of being selected high tape drive amplifier 50B by the communication pattern in order to operation multi-mode WCD 14 of MSM 24 selections.Comprise at selected communication pattern under the situation of cdma communication pattern, digitial controller 40 is selected the CDMA output port 101 of high tape drive amplifier 50B, described CDMA output port 101 provides enough gain and power outputs to the high frequency band of selected cdma communication pattern (for example, 1900 or 2100MHz).Comprise at selected communication pattern under the situation of gsm communication pattern, digitial controller 40 is selected the GSM output port 102 of high tape drive amplifier 50B, described GSM output port 102 provides enough gain and power outputs to the high frequency band (for example, 1800 to 1900MHz) of selected gsm communication pattern.

Fig. 5 explanation is from the one exemplary embodiment of the digitial controller 40 of Fig. 4.Digitial controller 40 is provided with each parameter in the variable component of the single modulation path of variable radio frequency modulator 22 based on the determined parameter from MSM24, with according to selected communication pattern treatment of simulated baseband signal.Described parameter can comprise gain, bandwidth, bias current, bias voltage and sharing model voltage.

Digitial controller 40 comprises analogue-to-digital converters (ADC) 110, multiplexer (mux) 112 and look-up table 114.ADC 110 receives analog voltage signal from the voltage PDM 34 of MSM 24, and described analog voltage signal is converted to digital voltage signal.Multiplexer 112 receives the numeral output of voltage PDM 34 at the determined parameter of the frequency band of selected communication pattern and from the output of the SBI 32 of MSM 24.Multiplexer 112 is applied to look-up table 114 at determined parameter with the numeral output of voltage PDM 34 or from one in the output of SBI 32.Look-up table 114 can produce gain control signal at the variable component in the variable radio frequency modulator 22 based on determined parameter.

In the illustrated embodiment, look-up table 114 comprises baseband filter look-up table (LUT) 116, base band VGA LUT117, RF VGA LUT 118 and driver amplifier LUT 119.Among the LUT 116 to 119 each produces gain control signal at the variable component separately along the single modulation path of variable radio frequency modulator 22.For instance, LUT116 to 119 and separately the gain control signal between the variable component can comprise 8 control words, but this can change in other embodiments.Among the described LUT each can be based on the gain control range (G of variable component _Range) and gain rate controlled (P _Max) come to produce gain control signal at variable component separately.

As an example, each among the LUT 116 to 119 can be according to produce gain control signal with minor function:

G wherein _RangeAnd P _MaxBe to be provided with at the variable component separately in the variable radio frequency modulator 22 by look-up table.In equation (1), G _RangeBe the value of enumerating at the required gain control range in each variable component, and P _MaxControl the speed that each variable component reaches its maximum gain.For instance, under the situation of cdma communication pattern, for baseband filter 45 G via reference current 41 _RangeBe 20dB and P _MaxBe 230mW, for base band VGA 46 G _RangeBe 18dB and P _MaxBe 240.9mW, for RF VGA 48 G _RangeBe 24dB and P _MaxBe 248.2mW, and for driver amplifier 50 G _RangeBe 32dB and P _MaxBe 248.2mW.

Baseband filter LUT 116 is provided with reference current 41 (Iref) based on the gain control signal of the baseband filter 45 that is used for operating according to selected communication pattern.Reference current 41 is fed into again among the DAC 38 in the MSM 24, and the parameter of baseband filter 45 is set via DAC 38.Base band VGA LUT 117 directly is provided with the parameter of base band VGA 46 based on the gain control signal of the base band VGA that is used for operating according to selected communication pattern.One the gain control signal that RF VGALUT 118 is associated based on RF the VGA 48 and frequency band selected communication pattern that is used for operating according to selected communication pattern directly is provided with the parameter of described one among the RF VGA 48.At last, one the gain control signal that is associated based on driver the amplifier 50 and frequency band selected communication pattern that is used for operating according to selected communication pattern of driver amplifier LUT 119 directly is provided with the parameter of described one in the driver amplifier 50.

Fig. 6 explanation with from the frequency up converters 44 of Fig. 4 similar one exemplary embodiment of frequency up converters 44A roughly.For purposes of illustration, Fig. 6 only shows homophase baseband filter 45A, homophase base band VGA 46A and low strap RF blender 47A.Usually, frequency up converters 44A also will comprise orthogonal basis band filter 45B, quadrature base band VGA 46B and high-band RF blender 47B.Can suppose that orthogonal basis band filter 45B roughly is similar to homophase baseband filter 45A, quadrature base band VGA 46B roughly is similar to homophase base band VGA 46A, and high-band RF blender 47B roughly is similar to low strap RF blender 47A.

Frequency up converters 44A receives homophases differential (that is, add and subtract) input current (Idacp 120 and Idacm 122) from the DAC 38 of MSM 24.Idacp 120 and Idacm 122 are input among the homophase baseband filter 45A.Homophase baseband filter 45A comprises transistor M1 and M2, and it is buffered to Idacp 120 and Idacm 122 capacitor C1 included among the homophase baseband filter 45A and transistor M3 and M4 separately respectively.Transistor M3 and M4 are based on being come homophase differential input current (Idacp 120 and Idacm 122) is carried out low-pass filtering by the parameter from the gain control signal setting that is used for baseband filter of digitial controller 40.Usually, homophase baseband filter 45A has 8 gain controlling via reference current 41 from the look-up table of baseband filter 45 (for example, from Fig. 5 baseband filter LUT 116).Transistor M3 and M4 then send to the low-pass version of Idacp 120 and Idacm 122 capacitor C2 included among the homophase base band VGA 46A and transistor M6 and M5 separately.

The homophase baseband filter 45A provide the step low-pass transfer function, and it is provided by following equation:

$\mathrm{iout}(s,\mathrm{pdm}):=\mathrm{Idac}\·5.8\·{10}^{\mathrm{Gbb}\·(\frac{\mathrm{pdm}}{p\max }-1)}\·\frac{1}{{\left(\frac{s}{\mathrm{\ωo}}\right)}^2+\frac{s}{\mathrm{\ωo}\·Q}+1}---\left(2\right)$

Value that can be by changing capacitor C1 and C2 and control the bandwidth of homophase baseband filter 45A by change via the electric current (pdm) of the SBI 32 of MSM 24 or voltage PDM 34.The bandwidth of homophase baseband filter 45A can change between 1MHz and 12MHz under nominal case.By the bandwidth that capacitor C1 and capacitor C2 value change homophase baseband filter 45A is set at selected communication pattern (for example, CDMA or GSM).Can select the parameter of homophase baseband filter 45A to provide the second order transfer function.

Transistor M3 and M6 comprise and are used for the feedback circuit of base band with sum signal.Observe transistor M6 drain electrode input impedance approximately by

Provide.In other words, the feedback circuit of transistor M3 and M6 realizes having induction coefficient $L=\frac{C2}{\mathrm{gm}3\&CenterDot;\mathrm{gm}6}$ Induction input impedance.The input current that flows among the transistor M6 is provided by following formula: $\frac{\mathrm{Iin}}{(1+R\&CenterDot;s\&CenterDot;\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A200680041545E00401.png,A200680041545E00451.png"\; state="\{\{state\}\}">C</figure-callout>}1+s^2\&CenterDot;\frac{C2}{\mathrm{gm}3\&CenterDot;\mathrm{gm}6}\&CenterDot;C1)}.$ According to this equation, Q by $Q:=\frac{1}{R\&CenterDot;\sqrt{\mathrm{gm}3\&CenterDot;\mathrm{gm}6}}\&CenterDot;\sqrt{\frac{C2}{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A200680041545E00401.png,A200680041545E00451.png"\; state="\{\{state\}\}">C</figure-callout>}1}}$ Provide, and cut-off frequency by $\mathrm{\&omega;o}:=\sqrt{\frac{\mathrm{gm}3\&CenterDot;\mathrm{gm}6}{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A200680041545E00401.png,A200680041545E00451.png"\; state="\{\{state\}\}">C</figure-callout>}1\&CenterDot;C2}}$ Provide.Similarly, transistor M4 and M5 comprise and are used for the feedback circuit of base band with subtracted signal.

Transistor M6 and M8 comprise the variable gain current mirror, make transistor M8 based on by amplify from the gain of the gain control signal setting that is used for base band VGA of digitial controller 40 or the base band from transistor M6 of decaying with sum signal to produce the same sum signal of intermediate frequency.Intermediate frequency is the convergent-divergent duplicate of base band with sum signal with sum signal.(it is by digitial controller 40 controls) come carrying out convergent-divergent with sum signal transistor M8 based on switches set 124.In addition, transistor M5 and M7 comprise the variable gain current mirror, make transistor M7 based on by amplify from the gain of the gain control signal setting that is used for base band VGA of digitial controller 40 or the base band from transistor M5 of decaying with subtracted signal to produce the same subtracted signal of intermediate frequency.Intermediate frequency is the convergent-divergent duplicate of base band with sum signal with sum signal.(it is by digitial controller 40 controls) come carrying out convergent-divergent with sum signal transistor M7 based on switches set 126.

In illustrated example, switches set 124 and switches set 126 each at only comprising two switches (d0 and d1) with each of addition and cut signal separately.Usually, homophase base band VGA 46A has 8 gain controlling from the look-up table that is used for base band VGA (for example, from Fig. 5 base band VGA LUT 117).Therefore, the switches set 124 in the homophase base band VGA 46A and switches set 126 each can comprise to 8 switches (d0 is to d7) nearly at homophase differential wave separately.

For purposes of illustration, this paper will be described as low-frequency band to the frequency band of selected communication pattern.In other embodiments, the frequency band of selected communication pattern can be a high frequency band.To be applied directly to low strap RF blender 47A from the transistor M8 of homophase base band VGA 46A and the intermediate frequency homophase differential wave of M7.In addition, low strap RF blender 47A receives RF homophase differential wave (Vlop and Vlom) from the low strap homophase LO buffer 89 of LO system 42.Though undeclared among Fig. 6, low strap RF blender 47A also receives from the intermediate frequency quadrature differential wave of quadrature base band VGA 46B with from the RF quadrature differential wave of the low strap quadrature LO buffer 90 of LO system 42.

Low strap RF blender 47A will from the intermediate frequency differential wave of VGA 46 with mix from the RF differential wave of low strap LO buffer 89,90, to produce the RF differential wave.To be applied to low strap RF VGA 48A from the RF differential wave (Imixp and Imixm) of low strap RF blender 47A output.

In the gsm communication pattern, the differential input current (Idacp 120 and Idacm122) that is input to frequency up converters 44A can not change with the gain controlling setting from digitial controller 40.In the gsm communication pattern, the gain controlling setting is fixed.For the gsm communication pattern, the value of programmable capacitor C1 and C2 is set to decimal system numerical value 9, and the value of natural electric current is set to decimal system numerical value 64.

In the cdma communication pattern, reduce the differential input current (Idacp 120 and Idacm 122) that is input to frequency up converters 44A by reducing reference current 41, reference current 41 is the functions that are used for the gain control signal of baseband filter 45.Along with differential input current reduces, gm2 reduces; This causes the bandwidth of homophase baseband filter 45A to reduce.In order to compensate, the electric current that passes M3 and M4 by increase increases the gm1 value to keep product gm1*gm2 constant.For the cdma communication pattern, the value of programmable capacitor C1 and C2 is set to decimal system numerical value 0.

Fig. 7 explanation with from the frequency up converters 44 of Fig. 4 similar another one exemplary embodiment of frequency up converters 44B roughly.For purposes of illustration, Fig. 7 only shows homophase baseband filter 45A, homophase base band VGA 46A and low strap RF blender 47A.Usually, frequency up converters 44B also will comprise orthogonal basis band filter 45B, quadrature base band VGA46B and high-band RF blender 47B.Can suppose that orthogonal basis band filter 45B roughly is similar to homophase baseband filter 45A, quadrature base band VGA 46B roughly is similar to homophase base band VGA 46A, and high-band RF blender 47B roughly is similar to low strap RF blender 47A.

Frequency up converters 44B receives homophases differential (that is, add and subtract) input current (Idacp and Idacm) from the DAC 38 of MSM 24.Idacp and Idacm are input among the homophase baseband filter 45A.Homophase baseband filter 45A comprises transistor M1 and M2, and it is buffered to capacitor C1 with Idacp and Idacm respectively.Transistor M1 and M2 are based on being come homophase differential input current (Idacp and Idacm) is carried out low-pass filtering by the parameter from the gain control signal setting that is used for baseband filter 45 of digitial controller 40.Usually, homophase baseband filter 45A has 8 gain controlling via reference current 41 from the look-up table of baseband filter 45 (for example, from Fig. 5 baseband filter LUT 116).Transistor M1 and M2 then send to the low-pass version of Idacp and Idacm capacitor C2 included among the homophase base band VGA 46A and transistor M3 and M4 separately.

The homophase baseband filter 45A provide the step low-pass transfer function, and it is provided by following equation:

$H1\left(s\right):=\frac{M\left(\mathrm{pdm}\right)}{\frac{s^2\&CenterDot;\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="A200680041545E00401.png,A200680041545E00451.png"\; state="\{\{state\}\}">C</figure-callout>}1\&CenterDot;C2}{a21\&CenterDot;a12}+\frac{a11}{a21\&CenterDot;a12}\&CenterDot;C2\&CenterDot;s+1}---\left(3\right)$

Can control the bandwidth of homophase baseband filter 45A by the value that changes capacitor C1 and C2.The bandwidth of homophase baseband filter 45A can change between 1MHz and 5MHz under nominal case.By the bandwidth that capacitor C1 and capacitor C2 value change homophase baseband filter 45A is set at selected communication pattern (for example, CDMA or GSM).Can select the parameter of homophase baseband filter 45A to provide the second order transfer function.

Transistor M3 is based on by amplifying from the gain of the gain control signal setting that is used for base band VGA of digitial controller 40 or decaying from the same sum signal of the base band of transistor M1, to produce the same sum signal of intermediate frequency.In addition, transistor M4 is based on by amplifying from the gain of the gain control signal setting that is used for base band VGA of digitial controller 40 or decaying from the same subtracted signal of the base band of transistor M2, to produce the same subtracted signal of intermediate frequency.

For purposes of illustration, this paper will be described as low-frequency band to the frequency band of selected communication pattern.In other embodiments, the frequency band of selected communication pattern can be a high frequency band.To be applied directly to low strap RF blender 47A from the transistor M3 of homophase base band VGA 46A and the intermediate frequency homophase differential wave of M4.In addition, low strap RF blender 47A receives RF homophase differential wave (Vlop and Vlom) from the low strap homophase LO buffer 89 of LO system 42.Though undeclared among Fig. 7, low strap RF blender 47A also receives from the intermediate frequency quadrature differential wave of quadrature base band VGA 46B with from the RF quadrature differential wave of the low strap quadrature LO buffer 90 of LO system 42.

Low strap RF blender 47A will from the intermediate frequency differential wave of VGA 46 with mix from the RF differential wave of low strap LO buffer 89,90, to produce the RF differential wave.To be applied to low strap RF VGA 48A from the RF differential wave (Imixp and Imixm) of low strap RF blender 47A output.

In the gsm communication pattern, the differential input current (Idacp and Idacm) that is input to frequency up converters 44B can not change with the gain controlling setting from digitial controller 40.In the gsm communication pattern, the gain controlling setting is fixed.In the cdma communication pattern, reduce the differential input current (Idacp 120 and Idacm 122) that is input to frequency up converters 44 by reducing reference current 41, reference current 41 is the functions that are used for the gain control signal of baseband filter 45.Along with differential input current reduces, gm2 reduces; This causes the bandwidth of homophase baseband filter 45A to reduce.In order to compensate, increase the gm1 value to keep product gm1*gm2 constant.

In the illustrated embodiment of frequency up converters 44B, the phase place of CDMA signal can and change along with voltage PDM setting, and this can cause unnecessary phase step.For the variation in the CDMA signal being reduced to minimum, the bandwidth of baseband filter 45A is set to needed wideer than cdma communication pattern, even make that bandwidth is lowered, also will there be minimum influence to phase place.Another kind of is to reduce the scope of reference current 41 in order to the variation of CDMA signal is reduced to minimum method.Other method is to keep reference current 41 to change but the current constant of gm2 is passed in maintenance by adding the electric current in parallel with input current.

Fig. 8 illustrates the one exemplary embodiment of one the LO buffer 130 that is associated with the frequency band of selected communication pattern in the driving RF blender 47 in the LO system 24.As mentioned with reference to describing from the LO system 24 of Fig. 4, the RF LO signal damping that LO buffer 130 can be by self-oscillation in future device 87 to four frequency division modules 88 that are used for low-frequency band or the two divided-frequency module 92 that is used for high frequency band drive RF blender 47 be associated with frequency band selected communication pattern one.

LO buffer 130 comprises push pull amplifier, and it can dynamically provide and absorption current.When differential input voltage (Vinp and Vinm) increased, transistor M1 and M2 were fed to load with electric current.When differential input voltage descended, the drain voltage of transistor M1 and M2 increased.This causes the grid voltage of transistor M3 and M4 to increase, and this helps from the load absorption current.Then based on the frequency band of selected communication pattern differential RF LO signal is exported (Vop and Vom) sends to four frequency division modules 88 or two divided-frequency module 92 to LO buffer 130.

Fig. 9 explanation is from the low strap LO buffer 89,90 of Fig. 4 or any one the one exemplary embodiment in the high-band LO buffer 93,94.Frequency band at selected communication pattern is under the situation of low-frequency band, and base band LO buffer 89 and 90 receives differential wave from four frequency division modules 88.Low strap LO buffer 89 and 90 then is buffered to the calibration LO path of being coupled to low strap RF blender 47A with differential output.Frequency band at selected communication pattern is under the situation of high frequency band, and high- band LO buffer 93 and 94 receives differential wave from two divided-frequency module 92.High- band LO buffer 93 and 94 then is buffered to the calibration LO path of being coupled to high-band RF blender 47B with differential output.

LO buffer 89,90,93 or 94 comprises source follower transistor M1 and M2, and it receives differential input voltage (Vinp and Vinm) separately from four frequency division modules 88 or two divided-frequency module 92.The LO signal that leads to the grid of M1 and M2 is the AC coupling.Cross-linked transistor M3 and M4 help absorption current, and also in open-drain (open drain) output stage bias current are set. LO buffer 89,90,93 or 94 also comprises biasing circuit 136, and it comprises transistor and a resistor that two diodes connect.Biasing circuit 136 duplicates and is used for adding the transistor M1 and the M3 of RF signal and is used for subtracting the transistor M2 of RF signal and the voltage drop of M4.LO buffer 89,90,93 or 94 with differential RF LO signal (Vlop and Vlom) output in the RF blender 47 be associated with frequency band selected communication pattern one.

Figure 10 explanation is from the one exemplary embodiment of the harmonic supression filter of Fig. 4.For purposes of illustration, Figure 10 only shows harmonic supression filter 95, and it carries out filtering to the RF differential wave that enters the low strap RF VGA 48A from low strap RF blender 47A.Can suppose roughly to be similar to harmonic supression filter 95 to enter the harmonic supression filter 99 that RF differential wave the high-band RF VGA 48B carries out filtering from high-band RF blender 47B.In some cases, can be with the harmonic supression filter cascade to realize higher inhibition.

Harmonic supression filter 95 receives RF differential wave (Iinp and Iinm) from low strap RF blender 47A.Harmonic supression filter 95 then suppresses the 3rd and high-order harmonic wave more from the RF differential wave of low strap RF blender 47A.The value of L and C2 is at third harmonic place resonance, and this causes in the third harmonic place impedance of RF differential wave very high.This forces from the RF differential wave of low strap RF blender 47A is mobile and passes C1, and the impedance of upper frequency place becomes more and more lower.Harmonic supression filter 95 then will send to low strap RF VGA48A through the RF of filtering differential wave (Ioutp and Ioutm).

If do not comprise harmonic supression filter 95 in the frequency up converters 44, the harmonic wave of RF differential wave will be owing to the cause of the third-order non-linear among the low tape drive amplifier 50A mixes with the fundamental frequency of RF differential wave among the low tape drive amplifier 50A so.Third-order non-linear makes the adjacent channel leak rate degradation of reflector 20.The adjacent channel leak rate of reflector 20 is good more, and the power disturbance that reflector 20 produces in adjacent channel is just few more.

Figure 11 explanation from one among the RF VGA 48 of Fig. 4 one exemplary embodiment.For purposes of illustration, Fig. 9 only shows low strap RF VGA 48A, it comprise be used for from low strap RF blender 47A receive subtract the RF signal subtract attenuator 138 and be used to add the RF signal add attenuator 144.Can suppose that high-band RF VGA 48B roughly is similar to low strap RF VGA 48A.Usually, RF VGA comprises by one group of 8 switch and one group 8 the 8 digit current attenuators of dumping switch control.Each current attenuator comprises five binary weighting NFET and 7 thermometer coding levels.Thermometer coding helps to keep the good linear of output current from the gain control signal of digitial controller 40.In the illustrated embodiment, in low strap RF VGA 48A, only show three switches for clarity.

When the frequency band of selected communication pattern comprised low-frequency band, low strap RF VGA 48A was based on by amplifying from the gain that is used for one the gain control signal setting that is associated with frequency band selected communication pattern RF VGA of digitial controller 40 or decaying from the RF differential wave of low strap RF blender 47A output.The differential output current of low strap RF blender 47A is applied to the input (Iinm and Iinp) of low strap RF VGA 48A.

Subtracting attenuator 138 comprises and dumps switches set 140 and switches set 142 by gain control signal control.Determine based on switches set 142 how many differential input currents are routed to the output (Ioutm) that subtracts attenuator 138 from the gain control signal of digitial controller 40, and based on dump switches set 140 determine with how many differential input currents be routed to subtract attenuator 138 dump output (Iout_dump).Adding attenuator 144 comprises also and to dump switches set 146 and switches set 148 by gain control signal control.Determine based on switches set 148 how many differential input currents are routed to the output (Ioutp) that adds attenuator 144 from the gain control signal of digitial controller 40, and based on dump switches set 140 determine with how many differential input currents be routed to add attenuator 144 dump output (Iout_dump).The layout of low strap RF VGA 48A is very important greater than the required decay of 30dB for keeping the isolation between input and the output signal.

For instance, when being set to height (promptly from all switches in the gain control signal switches set 142 and 148 of digitial controller 40, all that dump in switches set 140 and 146 are dumped switch and are set to low) time, all differential input currents are routed to the differential output (Ioutm and Ioutp) of differential separately attenuator 138 and 144.All switches in gain control signal switches set 142 and 148 be set to low (promptly, all that dump in switches set 140 and 146 are dumped switch and are set to height) time, differentially dump output (Iout_dump) with what all differential input currents were routed to differential attenuator 138 and 144.Described switches set is a binary weighting; Therefore, if gain control signal only with some switches in switches set 142 and 148 (for example, in 3 switches 2) be set to height, so will be (for example respective amount, 2/3) differential input current is routed to the differential output of differential attenuator and will dumps the differential input current of surplus (for example, 1/3).

As indicated above, in illustrated example, switches set 142 and 148 each only comprise three switches (d0 is to d2), and dump switches set 140 and 146 each only comprise that three are dumped switch (d0b is to d2b).Usually, low strap RF VGA 48A has 8 gain controlling from the look-up table that is used for RF VGA one (for example, from Fig. 5 RF VGA LUT 118) that are associated with frequency band selected communication pattern 48A.Therefore, the switches set 142 in the low strap RF VGA 48A and 148 and dump switches set 140 and 146 each can comprise to 8 switches (d0 is to d7) nearly.

Figure 12 explanation is from the one exemplary embodiment of one in the driver amplifier 50 of Fig. 4.For purposes of illustration, Figure 10 only shows low tape drive amplifier 50A.Can suppose that high tape drive amplifier 50B roughly is similar to low tape drive amplifier 50A.Usually, the driver amplifier comprises that 8 switch cascaded stages are to have 8 controls that have 5 binary weighting switches and 3 thermometer coding switches, so that improve the gain controlling linearity.In the illustrated embodiment, for for simplicity only in low tape drive amplifier 50A, showing two switch cascaded stages.

Low strap RF VGA 48A from Fig. 9 outputs to transformer 96 with RF differential wave (Ivga_p and Ivga_m), and described transformer 96 produces single RF signal according to the RF differential wave.Input signal is applied to low tape drive amplifier 50A via transformer 96.Transformer 96 can be through design to have the turn ratio of about 3:1.Transformer 96 then provides current gain by impedance conversion.The primary side of transformer 96 is connected to the differential output of low strap RF VGA 48A.The centre cap of the primary side of transformer 96 is that low strap RF blender/VGA piles up biasing is provided.Input impedance on the primary side of transformer 96 is provided with by the reflection input impedance of low tape drive amplifier 50A.The real part of this input impedance multiply by the width of low tape drive amplifier 50A by the closing line induction coefficient approx and is provided with.In the illustrated embodiment, use 4 closing lines in parallel to reduce input impedance and enough gains are provided.

The primary side of transformer 96 is connected to binary system and thermometer decoder switch cascaded stages 150A and the 150B in the low tape drive amplifier 50A.Transistor M1 will be connected to a grade 150B from the input current of transformer 96, and transistor M2 will be connected to a grade 150A from the input current of transformer 96.Transistor M1 and M2 are binary weightings; Therefore, each the input current amount that is applied to grade 150A and 150B is to be determined by the weight of transistor M2 and M1 separately.Low tape drive amplifier 50A also receives biasing input current (Ida) 156 from driver amplifier biasing circuit.Ida156 is input to transistor M0, and described transistor M0 reduces the interior thermal noise from transformer 96 of low tape drive amplifier 50A.

After receiving the RF input signal via transformer 96, level 150A and 150B are based on by amplifying from the gain that is used for one the gain control signal setting that is associated with frequency band selected communication pattern the driver amplifier of digitial controller 40 or decaying from the RF signal of low strap RF VGA 48A.Among level 150A reception input a*d0 154 and the b*d0 155 one, and one among level 150B reception input a*d1 153 and the b*d1 154, this depends on based on which person among selected communication pattern selection output port A and the B.The value of d0 and d1 can be by one the gain control signal setting that is associated with frequency band selected communication pattern the driver amplifier that is used for from digitial controller 40.In addition, based on the selected output port that is associated with selected communication pattern, only connect one among interior transistor M3 of one among interior transistor M5 of grade 150A and M6 and level 150B and the M4.

Switch cascaded stages 150A and 150B are roughly mutually the same, and the output current of common-source level are routed to selected one (da_outA or the da_outB) in the output port of low tape drive amplifier 50A.As indicated above, digitial controller 40 is selected output port based on selected communication pattern (for example, CDMA or GSM).For instance, output port A can be appointed as the cdma communication pattern output port 97 of low tape drive amplifier 50A.In addition, output port B can be appointed as the gsm communication pattern output port 98 of low tape drive amplifier 50A.

As indicated above, in illustrated example, low tape drive amplifier 50A only comprises two switch cascaded stages, promptly has the 150A of input d0 and has the 150B that imports d1.Usually, low tape drive amplifier 50A has 8 gain controlling from the look-up table that is used for one (for example, from Fig. 5 driver amplifier LUT 119) that are associated with frequency band selected communication pattern driver amplifier 50.Therefore, low tape drive amplifier 50A can comprise that it has input d0 to d7 to reaching 8 switch cascade states.

The output of binary add power level 150A and 150B is combined in two output windings.Use described coil the output of da_outA and da_outB output to be matched 50 ohm together with external capacitor.Under the large-signal condition, described coupling is optimized.Under peak power output, low tape drive amplifier 50A can be in about 20mA below-center offset.The bias current of low tape drive amplifier 50A increases and increases along with input voltage (Vinv_a and Vinv_b).Usually, low tape drive Amplifier Gain control range is approximately 33dB.

Figure 13 illustrates that the input current of will setovering is provided to the one exemplary embodiment of the driver amplifier biasing circuit 160 of one in the driver amplifier 50.In the illustrated embodiment, biasing circuit 160 is carried Ida156 is provided to low tape drive amplifier 50A from Figure 10.The bias current Ida156 of low tape drive amplifier 50A is applied to the device that diode connects, and the transistorized grid voltage that will hang down in the tape drive amplifier 50A is connected to this diode via the primary side of transformer 96.

The special biasing circuit of driver amplifier 50 needs reduces the change in gain with process and temperature.Biasing circuit 160 comprises transistor M1 to M9 in constant circuit, described constant circuit receives input current I1 164 and I2 162.Described constant circuit cause among the transistor M1 electric current with

Proportional, wherein Rds_M4 is the channel resistance of transistor M4, and it is directly proportional and is inversely proportional to temperature with accurate external resistor.This causes being used for the higher increase of the Ida 156 of low tape drive amplifier 50A, and this helps to make the gain of biasing circuit 160 to keep constant with temperature.

Some embodiment have been described.Yet, may make various modifications to these embodiment, and the principle of this paper statement also can be applicable to other embodiment.Method described herein can be implemented in hardware, software and/or firmware.The various tasks of these class methods can be embodied as can be by the instruction group of one or more array of logic elements (for example microprocessor, embedded controller or the IP kernel heart) execution.In an example, one or more these generic tasks are through being provided with to carry out in travelling carriage modem chip or chipset, and described chip or chipset are configured to the operation of the various devices of personal communicator such as control example such as cellular phone.

The technology of describing among the present invention can be implemented in general purpose microprocessor, application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other equivalent logic device.If implement in software, so described technology can be embodied as the instruction on the computer-readable medias such as random-access memory (ram), read-only memory (ROM), nonvolatile RAM (NVRAM), Electrically Erasable Read Only Memory (EEPROM), flash memory for example.Described instruction causes one or more processors to carry out functional some aspect of describing among the present invention.

As other example, embodiment can partly or entirely be embodied as hard-wired circuit, be embodied as the circuit arrangement that is fabricated in the application-specific integrated circuit (ASIC), perhaps be embodied as the firmware program that is loaded in the Nonvolatile memory devices or load or be loaded into software program the data storage medium as machine readable code from data storage medium, this category code is the instruction that can be carried out by array of logic elements such as for example microprocessors.Data storage medium can be a memory element array, for example semiconductor memory (its can include but not limited to dynamically or static RAM (SRAM), ROM and/or quickflashing RAM) or ferroelectric, two-way, polymerization or phase transition storage; Perhaps disc type such as disk or CD medium for example.

In the present invention, various technology have been described.For instance, the technology of operating according to two or more different communication modes in the single modulation path that allows the variable radio frequency modulator in multi-mode WCD has been described.Multi-mode WCD is supported under two or more different communication modes and operates.Multi-mode WCD can detect the service signal from the base station in the wireless communication system, and based on the communication pattern of the service signal that is detected select in order to the operation communication pattern.Technology described herein makes multi-mode WCD that the parameter of the variable component in the radio frequency modulator, for example gain, bandwidth, bias current, bias voltage and sharing model voltage can be set based on selected communication pattern.In this way, the single modulation path of the variable radio frequency modulator of communication pattern that can just operate according to multi-mode WCD is set to handle the audio or video signal from the user of WCD.

Though the height and the low frequency of main reference cdma communication pattern and gsm communication pattern bring description, described technology can be applicable to comprise the additional communication pattern or the different communication modes of multiple operational frequency bands.In addition, this paper with described technical description in the radio frequency modulator of WCD, to operate.Yet described technology also can be applicable to operate in the transceiver of WCD.For instance, described technology can be operated in 802.11 transceivers.These and other embodiment belongs in the scope of appended claims.

Claims (44)

1. method, it comprises:

Described two or more communication patterns of operation in the single modulation path of included variable radio frequency (RF) modulator in the multimode wireless communication apparatus (WCD) of supporting two or more communication patterns; And

By based on the parameter of the selected settings in described two or more communication patterns, come according to described selected one signals of handling from the user of described multi-mode WCD in the described communication pattern along the variable component of the described single modulation path of described variable radio frequency modulator.

2. method according to claim 1 is wherein operated in the described single modulation path that two or more communication patterns are included in described variable radio frequency modulator and is operated code division multiple access (CDMA) communication pattern and global system for mobile communications (GSM) communication pattern.

3. method according to claim 2, its CDMA modulation path that further comprises described variable radio frequency modulator is configured to support described gsm communication pattern.

4. method according to claim 1, it further comprises based on the service signal that is detected selects in described two or more communication patterns in order to operate one of described multi-mode WCD.

5. method according to claim 4, it further comprises:

Search meets first service signal of first in described two or more communication patterns that described multi-mode WCD supports; And

When described multi-mode WCD did not detect described first service signal, search met the two second service signal of the in described two or more communication patterns.

6. method according to claim 5, wherein said first service signal meet described code division multiple access (CDMA) communication pattern, and described second service signal meets described global system for mobile communications (GSM) communication pattern.

7. computer-readable media, it comprises the instruction that causes programmable processor to carry out following operation:

Described two or more communication patterns of operation in the single modulation path of included variable radio frequency (RF) modulator in the multimode wireless communication apparatus (WCD) of supporting two or more communication patterns; And

By based on the parameter of the selected settings in described two or more communication patterns, come according to described selected one signals of handling from the user of described WCD in the described communication pattern along the variable component of the described single modulation path of described variable radio frequency modulator.

8. computer-readable media according to claim 7, it further comprises causes described programmable processor to be selected in described two or more communication patterns in order to operate one the instruction of described multi-mode WCD based on the service signal that is detected.

9. computer-readable media according to claim 8, it further comprises the instruction that causes described programmable processor to carry out following operation:

Search meets first service signal of first in described two or more communication patterns that described multi-mode WCD supports; And

When described multi-mode WCD did not detect described first service signal, search met the two second service signal of the in described two or more communication patterns.

10. multimode wireless communication apparatus (WCD) of supporting two or more communication patterns, it comprises variable radio frequency (RF) modulator, described variable radio frequency modulator is described two or more communication patterns of operation in the single modulation path of described variable RF modulation, wherein said variable radio frequency modulator comes according to described selected one signals of handling from the user of described multi-mode WCD in the described communication pattern by based on the parameter of the selected settings in described two or more communication patterns along the variable component of the described single modulation path of described variable radio frequency modulator.

11. multi-mode WCD according to claim 10, wherein said variable radio frequency modulator operate code division multiple access (CDMA) communication pattern and global system for mobile communications (GSM) communication pattern in the described single modulation path of described variable radio frequency modulator.

12. multi-mode WCD according to claim 11, wherein said variable radio frequency modulator is configured to support described gsm communication pattern with the CDMA modulation path of described variable radio frequency modulator.

13. multi-mode WCD according to claim 10, it further comprises travelling carriage modulator-demodulator (MSM), and described MSM selects in described two or more communication patterns in order to operate one of described multi-mode WCD based on the service signal that is detected.

14. multi-mode WCD according to claim 13, wherein said MSM search meets first service signal of first in described two or more communication patterns that described multi-mode WCD supports, and when described multi-mode WCD did not detect described first service signal, search met the two second service signal of the in described two or more communication patterns.

15. multi-mode WCD according to claim 14, wherein said first service signal meet described code division multiple access (CDMA) communication pattern, and described second service signal meets described global system for mobile communications (GSM) communication pattern.

16. multi-mode WCD according to claim 10, the parameter of wherein said variable component comprises one or more in gain, bandwidth, bias current, bias voltage and the sharing model voltage.

17. a method, it comprises:

Select in order to move the communication pattern of multimode wireless communication apparatus (WCD) based on the service signal that is detected;

Frequency band at the communication pattern of described selection is determined parameter and power output;

The parameter of variable component of the single modulation path of variable radio frequency (RF) modulator included in the described multi-mode WCD is set based on described definite parameter; And

Communication pattern according to described selection comes with the signal of described variable radio frequency modulator processing from the user of described multi-mode WCD.

18. method according to claim 17 wherein selects described communication pattern to comprise:

When the service signal of described detection meet that described multi-mode WCD supports when moving first communication pattern of described multi-mode WCD, select described first communication pattern; And

When the service signal of described detection meet that described multi-mode WCD supports when moving the second communication pattern of described multi-mode WCD, select described second communication pattern.

19. method according to claim 17, it further comprises:

Determine the frequency band of the described communication pattern that the service signal of the communication pattern that service signal met of described detection and described detection is operated;

Select in order to move the described communication pattern of described multi-mode WCD based on the described communication pattern that service signal met of described detection; And

The described frequency band of the described communication pattern of operating at described service signal is determined parameter and power output.

20. method according to claim 17 is provided with wherein that to comprise based on described definite parameter along the parameter of the described variable component of the described single modulation path of described variable radio frequency modulator be that in the described variable component each produces gain control signal with digitial controller included in the described variable radio frequency modulator.

21. method according to claim 20, wherein said digitial controller comprises corresponding to each the look-up table in the described variable component, and wherein produce gain control signal comprise based in the described variable component each gain ranging and gain speed with one being that in the described variable component each produces described gain control signal separately in the described look-up table.

22. method according to claim 17, wherein the described variable component along the described single modulation path of described variable radio frequency modulator comprises baseband filter, base band variable gain amplifier, RF variable gain amplifier and driver amplifier, and the parameter that described variable component wherein is set comprises:

The parameter of described baseband filter is set via reference current;

The parameter of described base band variable gain amplifier is set;

One the parameter that is provided with that described frequency band in the described RF variable gain amplifier and communication pattern described selection is associated; And

One the parameter that is provided with that described frequency band in the described driver amplifier and communication pattern described selection is associated.

23. method according to claim 22, the signal of wherein handling from the user of described multi-mode WCD comprises:

Come the base band subscriber signal to be carried out filtering based on described parameter setting with described baseband filter;

Come to amplify described base band subscriber signal based on described parameter setting, to produce the intermediate frequency subscriber signal with described base band variable gain amplifier;

Described intermediate frequency subscriber signal is applied to the RF blender that is associated with the described frequency band of the communication pattern of described selection;

With described RF blender described intermediate frequency subscriber signal is mixed with RF signal from local oscillator to produce the RF subscriber signal;

Come with the described RF subscriber signal of decaying of described one in the described RF variable gain amplifier based on described parameter setting; And

Come to amplify described RF subscriber signal based on described parameter setting, so that enough gains and the power output at the described frequency band of the communication pattern of described selection to be provided with described one in the described driver amplifier.

24. method according to claim 17, it further comprises:

Select the output port of described variable radio frequency modulator based on the communication pattern of described selection; And

With enough gains and power output described treated subscriber signal is sent to reflector included the described multi-mode WCD from described variable radio frequency modulator via the output port of described selection at the described frequency band of the communication pattern of described selection.

25. a computer-readable media, it comprises the instruction that causes programmable processor to carry out following operation:

Select in order to move the communication pattern of multimode wireless communication apparatus (WCD) based on the service signal that is detected;

Frequency band at the communication pattern of described selection is determined parameter and power output;

The parameter of variable component of the single modulation path of variable radio frequency (RF) modulator included in the described multi-mode WCD is set based on described definite parameter; And

Communication according to described selection comes with the signal of described variable radio frequency modulator processing from the user of described multi-mode WCD.

26. it is that in the described variable component each produces gain control signal based on described definite parameter with digitial controller included in the described variable radio frequency modulator that computer-readable media according to claim 25, wherein said instruction cause described programmable processor.

27. computer-readable media according to claim 25, wherein the described variable component along the described single modulation path of described variable radio frequency modulator comprises baseband filter, base band variable gain amplifier, RF variable gain amplifier and driver amplifier, and wherein said instruction causes described programmable processor to carry out following operation:

Come the base band subscriber signal to be carried out filtering based on described parameter setting via reference current with described baseband filter;

Come to amplify described base band subscriber signal based on described parameter setting, to produce the intermediate frequency subscriber signal with described base band variable gain amplifier;

Described intermediate frequency subscriber signal is applied to the RF blender that is associated with the described frequency band of the communication pattern of described selection;

With described RF blender described intermediate frequency subscriber signal is mixed with RF signal from local oscillator to produce the RF subscriber signal;

Come the described RF subscriber signals of decaying that are associated with described frequency band in the described RF variable gain amplifier and communication pattern described selection based on described parameter setting; And

Come one to amplify described RF subscriber signal based on described parameter setting, so that enough gains and the power output at the described frequency band of the communication pattern of described selection to be provided with what described frequency band in the described driver amplifier and communication pattern described selection was associated.

28. computer-readable media according to claim 25, it further comprises the instruction that causes described programmable processor to carry out following operation:

Select the output port of described variable radio frequency modulator based on the communication pattern of described selection; And

With enough gains and power output described treated subscriber signal is sent to reflector included the described multi-mode WCD from described variable radio frequency modulator via the output port of described selection at the described frequency band of the communication pattern of described selection.

29. a multimode wireless communication apparatus (WCD), it comprises:

Receiver, it detects service signal;

Travelling carriage modulator-demodulator (MSM), its service signal based on described detection are selected to determine parameter and power output in order to the communication pattern that moves described multi-mode WCD and at the frequency band of the communication pattern of described selection; And

Variable radio frequency (RF) modulator, it comprises digitial controller, described digitial controller is provided with along the parameter of the variable component of the single modulation path of described variable radio frequency modulator based on the described definite parameter from described MSM, and wherein said variable radio frequency modulator is handled signal from the user of described WCD according to the communication pattern of described selection.

30. multi-mode WCD according to claim 29, wherein said MSM:

When the service signal of described detection meet that described multi-mode WCD supports when moving first communication pattern of described multi-mode WCD, select described first communication pattern; And

When the service signal of described detection meet that described multi-mode WCD supports when moving the second communication pattern of described multi-mode WCD, select described second communication pattern.

31. multi-mode WCD according to claim 29, wherein said MSM:

Determine the frequency band of the described communication pattern that the service signal of the communication pattern that service signal met of described detection and described detection is operated;

Select in order to move the described communication pattern of described multi-mode WCD based on the described communication pattern that service signal met of described detection; And

The described frequency band of the described communication pattern of operating at described service signal is determined parameter and power output.

32. multi-mode WCD according to claim 29, described digitial controller included in the wherein said variable radio frequency modulator is based on come to be each the generation gain control signal in the described variable component from described definite parameter of described MSM.

33. multi-mode WCD according to claim 32, wherein said digitial controller comprises corresponding to each the look-up table in the described variable component, and based in the described variable component each gain ranging and gain speed with one being that in the described variable component each produces described gain control signal separately in the described look-up table.

34. multi-mode WCD according to claim 29, wherein the described variable component along the described single modulation path of described variable radio frequency modulator comprises baseband filter, base band variable gain amplifier, RF variable gain amplifier and driver amplifier, wherein said digitial controller:

The parameter of described baseband filter is set via reference current;

The parameter of described base band variable gain amplifier is set;

One the parameter that is provided with that described frequency band in the described RF variable gain amplifier and communication pattern described selection is associated; And

One the parameter that is provided with that described frequency band in the described driver amplifier and communication pattern described selection is associated.

35. multi-mode WCD according to claim 34, wherein:

Described baseband filter comes the base band subscriber signal is carried out filtering based on described parameter setting;

Described base band variable gain amplifier amplifies described base band subscriber signal producing the intermediate frequency subscriber signal based on described parameter setting, and described intermediate frequency subscriber signal is applied to the RF blender that is associated with the described frequency band of the communication pattern of described selection;

Described RF blender mixes described intermediate frequency subscriber signal to produce the RF subscriber signal with RF signal from local oscillator;

In the described RF variable gain amplifier described one is based on the described parameter setting described RF subscriber signal of decaying; And

In the described driver amplifier described one amplifies described RF subscriber signal based on described parameter setting, so that enough gains and the power output at the described frequency band of the communication pattern of described selection to be provided.

36. multi-mode WCD according to claim 29, wherein said digitial controller is selected the output port of driver amplifier included in the described variable radio frequency modulator based on the communication pattern of described selection, and wherein said driver amplifier sends to described multi-mode WCD included reflector with described treated subscriber signal from described variable radio frequency modulator with enough gains and power output at the described frequency band of the communication pattern of described selection via the output port of described selection.

37. multi-mode WCD according to claim 29, wherein said radio frequency modulator comprises frequency up converters, and described frequency up converters comprises:

Baseband filter, it has the capacitor that the base band subscriber signal is carried out the cascade transistor of low-pass filtering and controls the bandwidth of described baseband filter according to parameter setting;

The base band variable gain amplifier, it is right that it has the transistor that forms current mirror, and described base band variable gain amplifier amplifies described base band subscriber signal from described baseband filter according to the transistor bit switch by the parameter setting; And

The RF blender, it is right that it has transistor, and described RF blender will mix with RF signal from local oscillator to produce the RF subscriber signal from the intermediate frequency subscriber signal of described base band variable gain amplifier.

38. multi-mode WCD according to claim 29, wherein said radio frequency modulator comprises the RF variable gain amplifier, and described RF variable gain amplifier has by the transistor bit switch of parameter setting with decay RF subscriber signal.

39. multi-mode WCD according to claim 29, wherein said radio frequency modulator comprises the driver amplifier, described driver amplifier has the transistor of switch cascade cascade being received the RF subscriber signal that is received, and wherein said switch cascaded stages is amplified described reception according to parameter setting RF subscriber signal is to provide enough gains and the power output at the described frequency band of the communication pattern of described selection.

40. according to the described multi-mode WCD of claim 39, wherein said radio frequency modulator comprises the driver amplifier biasing circuit with transistor constant circuit, and described transistor constant circuit produces and is used for the biasing input current of described driver amplifier to reduce the thermal noise of described driver amplifier.

41. multi-mode WCD according to claim 29, wherein said multi-mode WCD supports two or more communication patterns.

42. multi-mode WCD according to claim 29, the communication pattern of wherein said selection comprise one in code division multiple access (CDMA) communication pattern or global system for mobile communications (GSM) communication pattern.

43. multi-mode WCD according to claim 29, the described frequency band of the communication pattern of wherein said selection comprise one in the high frequency band of communication pattern of described selection or the low-frequency band.

44. multi-mode WCD according to claim 29, the parameter of wherein said variable component comprises one or more in gain, bandwidth, bias current, bias voltage and the sharing model voltage.

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