CN1917685A - Multi-mode-multi-band wireless transceiver - Google Patents
Multi-mode-multi-band wireless transceiver Download PDFInfo
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- CN1917685A CN1917685A CNA2006101157621A CN200610115762A CN1917685A CN 1917685 A CN1917685 A CN 1917685A CN A2006101157621 A CNA2006101157621 A CN A2006101157621A CN 200610115762 A CN200610115762 A CN 200610115762A CN 1917685 A CN1917685 A CN 1917685A
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Abstract
Disclosed is a multi-mode/multi-band wireless transceiver. The multi-mode/multi-band wireless transceiver includes a tunable duplexer including transmission and reception channel filters of which transmission and reception channel filtering frequencies respectively are controlled by an external element; and a control portion for controlling the transmission and reception channel filtering frequencies to correspond to transmission and reception channels of a current service band. Thus, a use of a RF SAW filter is unnecessary, while it is possible to support the multi-mode/multi-band using a tunable duplexer. Therefore, the number of parts and volume of the transceiver can be reduced, and it is possible to weaken a specification of an RF system.
Description
Technical field
The present invention relates to a kind of wireless transceiver, more particularly, relate to a kind of wireless transceiver of supporting multi-mode.
Background technology
Usually, the different communication plans that is used for mobile communication business is adopted in countries in the world, and each mobile communication project uses different frequency bands.
Each national mobile communication project comprises: for example, code division multiple access (CDMA) scheme, global system for mobile communications (GSM) scheme, GPRS (GPRS) scheme, GSM strengthen data rate and improve (EDGE) scheme, Wideband Code Division Multiple Access (WCDMA) (WCDMA) scheme etc.The frequency band that the CDMA scheme is used is 800MHz, 1800MHz and 1900MHz.The frequency band that the GSM scheme is used is 850MHz, 900MHz, 1800MHz and 1900MHz.The WCDMA scheme comprises frequency band 850MHz, 1900MHz and 2000MHz.
Wireless communications station in the past has been manufactured into the signal that uses one or two frequency band that adapts to the specific communication service that the user orders among all mobile communication businesses.Therefore, mobile radio station only can use one or both mobile communication businesses of using at particular country among the various mobile communication businesses.Therefore, when the user travelled to the area different with the communication service of his/her country or carries out visit on business, the user can not use the mobile radio station of this area, brings inconvenience to the user like this.
Therefore, the user need be able to receive the mobile radio station of the mobile communication business of All Countries.In addition, the manufacturer of mobile radio station need make the mobile radio station that the user can use mobile communication business at All Countries according to user's demand.In order to use all mobile communication businesses that in specific country, exist, need to support the mobile radio station of multi-mode and multiband.Term " multi-mode " meaning is based on Frequency Division Duplexing (FDD) (FDD) pattern of WCDMA scheme, based on time division duplex (TDD) pattern of GSM scheme etc., and term " multiband " is meant different frequency bands.
Can consider to have the multi-mode wireless transceiver of structure as shown in Figure 1.
Fig. 1 illustrates and supports two kinds of patterns (promptly, fdd mode and tdd mode), support to comprise WCDMA 2000, WCDMA 1900 in the fdd mode and three kinds of service frequency bands of WCDMA 850, and support to comprise the multi-mode wireless transceiver of the four kinds of service frequency bands of Personal Communications Services (PCS) 1900, Digital Cellular System (DCS) 1800, GSM 900 and GSM 850 in the tdd mode.In WCDMA 2000, WCDMA 1900, WCDMA 850, PCS 1900, DCS 1800, GSM 900 and GSM 850, numeral 2000,1900,800 and 850 is represented the frequency band of 2000MHz, 1900MHz, 1800MHz and 850MHz respectively.
WCDMA 2000, WCDMA 1900 and WCDMA 850 are illustrated respectively in the frequency band of 2000MHz, 1900MHz and 850MHz in the WCDMA scheme.PCS 1900, DCS 1800, GSM900 and GSM 850 represent the frequency band of 1900MHz, 1800MHz, 900MHz and 850MHz respectively.
With reference to Fig. 1, antenna 104 selectively is connected to duplexer 108,110 and 112 and transmission/reception (T/R) switch 156 by switch 106.Described duplexer 108,110 and 112 sends and receives the signal of three kinds of frequency bands of WCDMA 2000, WCDMA 1900 in the fdd mode and WCDMA 850 respectively.Transmission and reception that described T/R switch 156 switches about the frequency band of PCS 1900, DCS 1800, GSM 900 and GSM 850.
Describe the operation of multi-mode wireless transceiver with reference to Fig. 1, wherein, the current business frequency band is one of WCDMA 2000, WCDMA 1900 and WCDMA 850, and the multi-mode wireless transceiver is operated the reception about signal in fdd mode.The received signal that is incorporated into switch 106 from antenna 104 is applied to the low noise amplifier (LNA) 114,116 and 118 of radio frequency integrated circuit (RFIC) 102 with the current business frequency band corresponding one, and described signal is by being exaggerated with corresponding one of the current business frequency band of WCDMA 2000, WCDMA 1900 and WCDMA 850 in duplexer 108,110 and 112.To be input to radio frequency (RF) receiving unit 126 by the received signal that each LNA 114,116 or 118 is exaggerated by each radio frequency surface acoustic wave (RF SAW) filter 120,122 or 124 that is installed in RFIC 102 outsides, and convert thereof into baseband signal by RF receiving unit 126, this signal offers baseband processing unit 100 the most at last.When adopting under the situation of multi-mode wireless transceiver in mobile radio station, baseband processing unit 100 moves as the modulator-demodulator of mobile communication.
Also describe the operation of multi-mode wireless transceiver with reference to Fig. 1, wherein, the current business frequency band is one of WCDMA 2000, WCDMA 1900 and WCDMA 850, and the multi-mode wireless transceiver is operated the transmission about signal in fdd mode.Send to the baseband signal that RF sends part 128 from baseband processing unit 100 and be converted into the RF signal, and by with corresponding one of current business frequency band this signal being carried out pre-power amplification in pre-power amplifier (PPA) 130,132 and 134.The transmission signal that carries out pre-power amplification by each PPA 130,132 or 134 is by in the band pass filter (BPF) 136,138 or 140 with the current business frequency band corresponding one, and carry out power amplification by 142,144 or 146 pairs of these signals of each power amplifier (PA), by with corresponding one of current business frequency band this signal being applied to switch 106 successively in duplexer 108,110 and 112.Then, by switch 106 and antenna 104 this signal is sent.
Also describe the operation of multi-mode wireless transceiver with reference to Fig. 1, wherein, the current business frequency band is one of PCS 1900, DCS 1800, GSM 900 and GSM 850, and the multi-mode wireless transceiver is operated the reception about signal in tdd mode.The signal that is incorporated into switch 106 from antenna 104 by PA module 154 T/R switch 156 and BPF162,164,166 and 168 with the current business frequency band corresponding one, this signal is applied among the LNA 170,172,174 and 176 of RFIC 102 with the current business frequency band corresponding one subsequently.To be input to RF receiving unit 178 by each LNA 170,172,174 or 176 amplifying signals, and convert thereof into baseband signal by RF receiving unit 178.Then, this signal is offered baseband processing unit 100.
Also describe the operation of multi-mode wireless transceiver with reference to Fig. 1, wherein, the current business frequency band is one of PCS 1900, DCS 1800, GSM 900 and GSM 850, and the multi-mode wireless transceiver is operated the transmission about signal in tdd mode.Baseband signal is sent to RF from baseband processing unit 100 send part 148, send part 148 by RF then and convert thereof into the RF signal.Then, by with the corresponding PPA 150 of current business frequency band or 152 in one the PF signal carried out pre-power amplification.After carrying out pre-power amplification, amplifying signal is applied to switch 106 by T/R switch 156 by the PA 158 of PA module 154 or 160 pairs of described signals.At last, by switch 106 and antenna 104 amplifying signal is sent.
The multi-mode wireless transceiver of Gou Jianing adopts independent duplexer to each service frequency bands in each business model or the fdd mode as shown in Figure 1.Have the duplexer that is used to the fixed frequency band that sends/accept filter because transceiver uses, be necessary so adopt independent duplexer.
In addition, service frequency bands is by independent RF SAW filter, and this RF SAW filter must be fit to each business model or each service frequency bands.This is because the transmission and the receiving filter of duplexer are band filters.The main cause of using RF SAW filter is to reduce the interference that sends in fdd mode between signal and the received signal frequency band.
Yet, because duplexer or SAW filter are the band pass filters by service frequency bands, therefore the conversion of signals that receives is become the 3rd rank input intercept point (IIP3) and second rank input intercept point (IIP2) characteristic of the frequency mixer of low-frequency band do not have help for improving band internal congestion characteristic or alleviating at the RF receiving unit.Therefore, be difficult to relax the standard of RF system.
In addition, owing to use independent duplexer and RFSAW filter at each business model or each frequency band respectively, therefore they all are burdens for transceiver aspect cost, volume and required assembly area.Especially, along with the progress of circuit engineering, active parts is tending towards having the size that reduces gradually.Yet owing to still do not have small size such as the passive component of RF SAW filter, it is burden for transceiver.
Under situation about supporting such as all different business models of FDD and TDD, owing to must in transceiver, use the duplexer that is used for fdd mode separately and be used for the T/R switch that T/R switches, therefore, they all are burdens for transceiver aspect the cost of transceiver, volume and required assembly area.
Summary of the invention
Therefore, carry out the present invention to solve the problems referred to above that take place in the prior art, and the object of the present invention is to provide a kind of multi-mode wireless transceiver, described transceiver in multi-mode or multiband with at the same parts that comprise that quantity and volume reduce of monotype or single band, and in transceiver, can weaken the standard of RF system.
To achieve these goals, according to an aspect of the present invention, a kind of multi-mode wireless transceiver is provided, and this transceiver comprises: the adjustable double multiplexer comprises transmission and the receive channel filter of being controlled transmission and receive channel filtration frequency by external component respectively; And control section, be used to control transmission and receive channel and filter frequency with corresponding with the transmission and the receive channel of current business frequency band.
To achieve these goals, according to a further aspect in the invention, a kind of multi-mode wireless transceiver is provided, and this transceiver comprises: the adjustable double multiplexer comprises transmission and the receive channel filter of being controlled transmission and receive channel filtration frequency by external component respectively; Send and RX path, corresponding with a plurality of service frequency bands respectively; The frequency acceptance band switch is used for selectively will being connected to the receive channel filter with the corresponding RX path of current business frequency band; Send band switch, be used for selectively will being connected to the transmitting channel filter with the corresponding transmit path of current business frequency band; And control section, be used for controlling respectively transmission and receive channel and filter frequency, and be used for the control reception and send band switch with corresponding with the current business frequency band with corresponding with the transmission and the receive channel of current business frequency band.
Description of drawings
By the detailed description of carrying out below in conjunction with accompanying drawing, above and other objects of the present invention, characteristics and advantage will become apparent, wherein:
Fig. 1 is the block diagram that the multi-mode wireless transceiver is shown;
Fig. 2 illustrates the block diagram of multi-mode wireless transceiver according to an embodiment of the invention;
Fig. 3 is the diagram that frequency response characteristic that the duplexer that has variable frequency range according to an embodiment of the invention is shown and the frequency response characteristic with duplexer of fixed frequency band filter compare;
Fig. 4 illustrates the diagrammatic sketch of the equivalent electric circuit of adjustable double multiplexer according to an embodiment of the invention; With
Fig. 5 illustrates the block diagram of RF receiver according to an embodiment of the invention.
Embodiment
Below, describe the preferred embodiments of the present invention with reference to the accompanying drawings in detail.Below in the description of the invention, omit be combined in this known function and the detailed description of structure to avoid fuzzy subject content of the present invention.
Fig. 2 illustrates the block diagram of multi-mode wireless transceiver according to an embodiment of the invention.The multi-mode wireless transceiver of Fig. 2 adopts adjustable double multiplexer 208.This adjustable double multiplexer 208 comprises the frequency response characteristic 304 that has as shown in Figure 3 and 306 channel model, and can change in the mode different and send and receive channel filters frequency with the duplexer 108,110 and 112 of Fig. 1, wherein, duplexer 108,110 and 120 is the band filters that are used to filter service frequency bands.
Fig. 3 illustrates the frequency response characteristic of the adjustable double multiplexer 208 of Fig. 2 and the comparison carried out as the frequency response characteristic such as the duplexer of the fixed frequency band filter of duplexer 108,110 and 112 of Fig. 1.In Fig. 3, label 300 and 302 is represented the transmission frequency response and the receive frequency response of duplexer respectively, and this duplexer is the fixed frequency band filter, and label 304 and 306 is represented the transmission frequency response and the receive frequency response of adjustable double multiplexer 208 respectively.As shown in Figure 3, be appreciated that the frequency response 300 and 302 frequency bands that filter about transmission frequency band and frequency acceptance band of duplexer (as the fixed frequency band filter), and the channel that adjustable double multiplexer 208 filters about transmitting channel TX CH and receive channel RX CH.In addition, left and right sides arrow represents that the transmission of adjustable double multiplexer 208 and receive channel filtration frequency are adjustable.
Adjustable double multiplexer 208 comprises transmitting channel and the receive channel filter of being controlled transmission and receive channel filtration frequency respectively by peripheral control unit.Transmission and receive channel by this adjustable double multiplexer 208 of baseband processing unit 200 controls filter frequency.Baseband processing unit 200 is by serial peripheral interface (SPI) or internal integrated circuit (I
2C) interface control sends and receive channel filtration frequency, thereby corresponding with the transmission and the receive channel of current business frequency band.Therefore, adjustable double multiplexer 208 can will send signal and received signal separately by filter channel according to the transmission of current business frequency band and receive channel.
Fig. 4 illustrates the equivalent circuit diagram of adjustable double multiplexer 208, and with reference to Fig. 4, this adjustable double multiplexer 208 comprises: transmitting channel filter 400 is placed between antenna end ANT and the transmission signal input part TX and is connected to antenna end ANT will send signal input part TX; Receive channel filter 402 is placed between antenna end ANT and the received signal output RX so that received signal output RX is connected to antenna end ANT.Transmitting channel filter 400 comprises: inductance L is placed between antenna end ANT and the transmission signal input part TX, and is connected in series; Tunable capacitor C1 and C2 are placed on respectively between inductance two ends and the ground, and are connected in parallel, thereby form equivalent electric circuit.Receive channel filter 402 comprises: tunable capacitor C is placed between antenna end ANT and the received signal output RX, and is connected in series; Inductance L 1 and L2 are placed on respectively between tunable capacitor C two ends and the ground, and are connected in parallel, thereby form equivalent electric circuit.
Baseband processing unit 200 can change capacitance, and the capacitance of promptly adjustable capacitor C 1 and C2 and the capacitance of tunable capacitor C filter frequency with transmission and the receive channel of controlling each transmitting channel filter 400 or receive channel filter 402.In order to control the capacitance of tunable capacitor C1, C2 and C, transmitting channel filter 400 and receive channel filter 402 comprise the capacitance group (not shown).
Capacitance group is set to have a plurality of electric capacity with various reference capacitance values.Baseband processing unit 200 is selected in the capacitance group electric capacity and the combining of the corresponding electric capacity of necessary capacitance, and provides described electric capacity as tunable capacitor C1, C2 and C.Necessary electric capacity is to provide adjustable capacitance in register and the switch selection capacitance group electric capacity.That is, can finish the selection of the electric capacity of carrying out by switch and the switching controls that is used to switch of baseband processing unit 200 by register.
Determine to use the variable frequency scope of this capacitance group and the bandwidth and the characteristic of transmitting channel filter 400 and receive channel filter 402 by the service frequency bands that is using.Capacitance group is designed to control and frequency relevant capacitance value according to the channel of all available service frequency bands of the multi-mode wireless transceiver of Fig. 2.
Adjustable double multiplexer 208 can be preferably microelectromechanical systems (MEMS) device with good isolation characteristic and size of inserting loss characteristics and reducing.
Frequency acceptance band switch 210 is connected to the receive channel filter of adjustable double multiplexer 208.Frequency acceptance band switch 210 selectively will be connected to the receive channel filter with the corresponding RX path of current business frequency band respectively with in the corresponding RX path 244,246 of a plurality of service frequency bands and 248.In addition, send the transmitting channel filter that band switch 212 is connected to adjustable double multiplexer 208.Send band switch 212 and selectively will be connected to the transmitting channel filter with the corresponding transmit path of current business frequency band respectively with in the corresponding transmit path 250,252 of a plurality of service frequency bands and 254.
In addition, frequency acceptance band switch 210 and transmission band switch 212 preferably are made of the MEMS device.Especially, adjustable double multiplexer 208, frequency acceptance band switch 210 and transmission band switch 212 preferably are integrated on the MEMS device with good isolation characteristic and insertion loss characteristics.Label 206 expressions comprise adjustable double multiplexer 208, frequency acceptance band switch 210 and send the MEMS device of band switch 212.In addition, realize the switching of frequency acceptance band switch 210 and transmission band switch 212 by the control of baseband control unit 200.Baseband control unit 200 is by SPI or I
2C interface control frequency acceptance band switch 210 and transmission band switch 212 are with corresponding with the current business frequency band.
Frequency acceptance band switch 210 is connected to the RF receiving unit 220 of RF IC 202 by RX path 244,246 and 248.Send band switch 212 and send part 222 by the RF that transmit path 250,252 and 254 is connected to RF IC 202.RF IC 202 comprises adjustable LNA 214,216 and 218, RF receiving unit 220, and RF sends part 222, and adjustable PPA 224,226 and 228.The RF receiving unit 220 of RF IC 202 and RF send part 222 and are connected to baseband processing unit 200.
Multi-mode wireless transceiver at Fig. 2 provides under the situation of service frequency bands, RX path 244,246 and 248 and transmit path 250,252 and 254 illustrate as example, described service frequency bands is divided into three frequency bands, that is, and and high frequency band, midband and low-frequency band.Just, RX path 244 and transmit path 250 are the paths that receive and send high frequency band RF signal, RX path 246 and transmit path 252 are the paths that receive and send midband RF signal, and RX path 248 and transmit path 254 are the paths that receive and send low-frequency band RF signal.
For example, high frequency band is set to frequency 2000MHz, and midband is set to frequency 1800MHz～1900MHz, and low-frequency band is set to frequency 800MHz～900MHz.As shown in Figure 1, if wireless transceiver is supported WCDMA 2000, WCDMA 1900, WCDMA 850, PCS 1900, DCS1800, GSM 850 and GSM 900, pass through RX path 244 and transmit path 250 receptions and transmission RF signal so based on WCDMA 2000, receive and send RF signal by RX path 246 and transmit path 252, receive and send RF signal based on WCDMA 850, GSM 850 and GSM 900 by RX path 248 and transmit path 254 based on WCDMA 1900, PCS 1900 and DCS 1800.
RX path 244,246 and 248 comprises the LNA 214,216 and 218 of the received signal of amplifying high frequency band, midband and low-frequency band respectively.LNA 214,216 and 218 has respectively and the corresponding amplification characteristic of high frequency band, midband and low-frequency band.
Transmit path 250,252 and 254 comprises adjustable PPA 224,226 and 228 and PA 238,240,242 respectively, described adjustable PPA 224,226 and 228 can be respectively carries out pre-power amplification to the transmission signal of high frequency band, midband and low-frequency band, and described PA 238,240,242 carries out power amplification to the transmission signal of pre-power amplification respectively.Have with the PPA of high frequency band, midband and the corresponding amplification characteristic of low-frequency band and PA and be used as PPA 224,226 and 228 and PA 238,240,242.In addition, input switch 232, BPF 234 and output switch 236 are arranged in transmit path 250,252 and 254, described input switch 232, BPF 234 and output switch 236 be placed on PPA224,226 and 228 with PA 238,240,242 between, and connection PPA 224,226 and 228 and PA 238,240,242.
Input switch 232 selectively will be connected to the input of BPF 234 with the corresponding output of current business frequency band among the PPA 224,226 and 228 of transmit path 250,252 and 254.Control BPF 234 by the control of baseband processing unit 200, thereby filtered bands is corresponding with the current business frequency band.Output switch 236 selectively is connected to the output of BPF 234 among the PA 238,240,242 on transmit path 250,252 and 254 input with the corresponding PA of current business frequency band.
Preferably, BPF 234, input switch 232 and output switch 236 also are integrated on the MEMS device with good isolation characteristic and insertion loss characteristics.Label 230 expressions comprise the MEMS device of BPF 234, input switch 232 and output switch 236.In addition, also realize the switching of input switch 232 and output switch 236 by the control of baseband processing unit 200.Baseband processing unit 200 is by SPI or I
2C control BPF 234, input switch 232 and output switch 236, thus BPF 234, input switch 232 are corresponding with the current business frequency band with output switch 236.
Below, the operation of multi-mode wireless transceiver is described with reference to Fig. 2, adjustable double multiplexer 208 uses the receive channel filter to isolate and the corresponding signal of current business frequency band from the signal that is received by antenna 204, and this signal is outputed to frequency acceptance band switch 210.Frequency acceptance band switch 210 will output to from the signal of adjustable double multiplexer 208 input RX path 244,246 and 248 and the corresponding RX path of current business frequency band.Therefore, after being exaggerated with the corresponding LNA of the channel of current business frequency band in by LNA 214,216 and 218 with the corresponding received signal of the channel of current business frequency band, this received signal is imported into RF receiving unit 220, convert thereof into baseband signal by RF receiving unit 200, and offer baseband processing unit 200.
Sending by RF after part 222 converts baseband transmit signals to the RF signal, by carrying out pre-power amplification from the baseband transmit signals that baseband processing unit 200 is applied to RF transmitting element 222 with the corresponding PPA of current business frequency band among the PPA 224,226 and 228 on transmit path 250,252 and 254.By input switch 232 amplified transmission signal is input to BPF 234, and it is filtered based on the current business frequency band.After the transmission signal that will filter with the corresponding PA of current business frequency band amplifies, send the transmission signal that filters by sending band switch 212, adjustable double multiplexer 208 and antenna 204 in by PA 238,240 and 242.
Compare with the device among Fig. 1, the multi-mode wireless transceiver of noticing Fig. 2 has and replaces duplexer 108,110 and 112 and the adjustable double multiplexer 208 of T/R switch 156.Just, because control sends and receive channel filtration frequency with corresponding, so only use an adjustable double multiplexer 208 just can replace duplexer 108,110 and 112 and T/R switch 156 with the channel of current business frequency band.
In addition, adjustable double multiplexer 208 is not a band filter, but filters the channel model of transmission and receive channel, thereby has extraordinary channel selectivity.Specifically, when transmission that high Q value channel model is used as adjustable double multiplexer 208 and receive channel filter, adjustable double multiplexer 208 can have the attenuation characteristic and the isolation characteristic of the duplexer that is better than filtered bands.Therefore, there is no need to use passive component, the RF SAW filter 120,122 and 124 on RX path shown in Figure 1 that promptly in the FDD scheme, needs.Just, for with LNA 114,116 and 118 and the received signal of RF receiving unit 126 convert low-frequency band to, RF SAW filter 120,122 that uses between frequency mixer and 124 good isolation and attenuation characteristics owing to adjustable double multiplexer 208 are removed.In addition, because adjustable double multiplexer 208 is channel models, therefore can significantly improve band internal congestion characteristic, and the IIP3 by weakening frequency mixer and the IIP2 characteristic standard of coming attenuation systems, this frequency mixer converts the received signal in the RF receiving unit 220 to low-frequency band.
Multi-mode wireless transceiver about Fig. 1, if RF SAW filter 120,122 and 124 is not used for the multi-mode wireless transceiver, then must be increased in the linear characteristic of frequency mixer in the RF receiving unit 126 greatly, thereby increase electric consumption.On the contrary, although RF SAW filter is not used for the multi-mode wireless transceiver of Fig. 2, adjustable double multiplexer 208 provides suitable filtration.Therefore, do not increase electric consumption.
In addition, under the situation of two kinds of different patterns supporting for example fdd mode and tdd mode and a plurality of service frequency bands, the multi-mode wireless transceiver is shared a RF system, that is, adjustable double multiplexer 208, RF receiving unit 220 and RF send part 222.Therefore, the multi-mode wireless transceiver has for the crucial assembly area that reduces of terminal, low cost, and is applied to terminal in the mode of considering software-defined radio (SDR).
Fig. 5 illustrates the block diagram of RF receiving unit 220 according to an embodiment of the invention.RF receiving unit 220 comprises: frequency mixer 500, adjustable analog filter 502, variable gain amplifier (VGA) 504, analog to digital converter (ADC) 506, digital filter and digital VGA 508 and digital to analog converter (DAC) 510.Adjustable analog filter 502 has different filtration frequency and the gain amplifier that is determined by baseband processing unit 200 with digital filter with digital VGA 508.Baseband processing unit 200 is by SPI or I
2C interface is controlled adjustable analog filter 502 and digital filter and digital VGA 508 with corresponding with the receive channel frequency of current business frequency band.
By frequency mixer 500 signal and the local frequency signal LO that receives carried out mixing, convert low-frequency band then to, the signal of this reception is to import with the corresponding LNA of current business frequency band from the LNA 214,216 and 218 of Fig. 2.According to order, filter the signal of reception with corresponding with the signal of current business frequency band by adjustable analog filter 502.Then, the signal of reception converts digital signal to by ADC 506, is handled by digital filter and digital VGA 508, converts analog signal to by DAC 510 again, offers baseband processing unit 200 then.
As mentioned above, adjustable analog filter 502 and digital filter and digital VGA 508 are the channel models as adjustable double multiplexer 208, thereby have extraordinary channel selectivity.
As mentioned above, because multi-mode wireless transceiver of the present invention adopts the adjustable double multiplexer, so the multi-mode wireless transceiver only uses a duplexer just can support all multi-modes and multiband.
In addition, owing to use and have the adjustable double multiplexer of good channel selectivity, attenuation characteristic and isolation characteristic as channel model, therefore there is no need to use the required RFSAW filter of RX path of FDD scheme, and can significantly improve band internal congestion characteristic, weaken the IIP3 and the IIP2 characteristic of frequency mixer, the conversion of signals that this frequency mixer is used for receiving becomes low-frequency band.
Therefore, can reduce the quantity, assembly area of parts and and weaken the standard of RF system.
Although describe embodiments of the invention for supporting multi-mode, but the present invention also can be applicable to support the wireless transceiver of monotype/multiband, in this case, adjustable double multiplexer 208 is used for transceiver, thereby there is no need to place on RX path RF SAW filter.
Fig. 2 illustrates RX path and the transmit path that has three kinds of frequency bands respectively.But, if at LNA214,216 and 218, PPA 224,226 and 228 and the frequency band amplification characteristic of PA 238,240 and 242 in no problem, then can use single RX path and single transmit path.In monotype and multi-mode, support single band and do not support under the situation of multiband when service frequency bands, also can use single RX path and single transmit path.In this case, there is no need to use to send band switch 212 and frequency acceptance band switch 210, and input switch 232 and output switch 236.In addition, can use LNA 214,216 or 218, PPA 224,226 or 228 and PA 238,240 or 242.
The structure that sends part 222 according to RF there is no need to use BPF 234.Just, if adopted direct translation type RF to send in wireless transceiver, then BPF 234 is necessary.Yet if adopted polarization type RF to send in wireless transceiver, BPF 234 there is no need.
In addition, although baseband processing unit 200 is controlled adjustable analog filter 502 and the digital filter and the digital VGA508 of adjustable double multiplexers 208, transmission band switch 212 and frequency acceptance band switch 210, input switch 232 and output switch 236, BPF234, RF receiving unit 220 as the example shows, but, can adopt CPU (CPU) to replace baseband processing unit 200 in order to control these parts.
Although illustrate and described the present invention with reference to its specific preferred embodiment, but it should be appreciated by those skilled in the art, under the situation that does not break away from the spirit and scope of the present invention that are defined by the following claims, can carry out the various changes of form and details to it.
Claims (21)
1, a kind of multi-mode wireless transceiver comprises:
The adjustable double multiplexer comprises transmission and the receive channel filter of being controlled transmission and receive channel filtration frequency by external component respectively; And
Control section is used to control transmission and receive channel and filters frequency with corresponding with the transmission and the receive channel of current business frequency band.
2, multi-mode wireless transceiver as claimed in claim 1, wherein, send and receive channel filtration frequency by controlling by the capacitance of tuning each transmission of control section and receive channel filter, and transmission and receive channel filter comprise by the tuning capacitance group of control section, thereby described capacitance is with corresponding based on the channel of all professional frequency bands.
3, multi-mode wireless transceiver as claimed in claim 1, wherein, the adjustable double multiplexer is a Micro Electronic Mechanical System device.
4, multi-mode wireless transceiver as claimed in claim 1, wherein, transmission and receive channel filter are high Q value filtering devices.
5, as any one the described multi-mode wireless transceiver in the claim 1 to 4, wherein, described control section is a baseband processing unit, and this baseband processing unit is used to handle transmission and the received signal with the corresponding base band of RF signal that sends and receive by the adjustable double multiplexer.
6, multi-mode wireless transceiver as claimed in claim 5, wherein, baseband processing unit sends by serial peripheral interface control and receive channel filters frequency.
7, multi-mode wireless transceiver as claimed in claim 5, wherein, baseband processing unit sends by the control of internal integrated circuit interface and receive channel filters frequency.
8, a kind of multi-mode wireless transceiver comprises:
The adjustable double multiplexer comprises transmission and the receive channel filter of being controlled transmission and receive channel filtration frequency by external component respectively;
Send and RX path, corresponding with a plurality of service frequency bands respectively;
The frequency acceptance band switch is used for selectively will being connected to the receive channel filter with the corresponding RX path of current business frequency band;
Send band switch, be used for selectively will being connected to the transmitting channel filter with the corresponding transmit path of current business frequency band; And
Control section is used for controlling respectively transmission and receive channel and filters frequency with corresponding with the transmission and the receive channel of current business frequency band, and is used for the control reception and sends band switch with corresponding with the current business frequency band.
9, multi-mode wireless transceiver as claimed in claim 8, wherein, control transmission and receive channel filtration frequency by the capacitance that uses tuning each transmission of control section and receive channel filter, and transmission and receive channel filter comprise by the tuning capacitance group of control section, thereby described capacitance is with corresponding based on the channel of all professional frequency bands.
10, multi-mode wireless transceiver as claimed in claim 8, wherein, the adjustable double multiplexer is a Micro Electronic Mechanical System device.
11, multi-mode wireless transceiver as claimed in claim 10, wherein, adjustable double multiplexer and transmission and frequency acceptance band switch are integrated on the microelectromechanical systems.
12, multi-mode wireless transceiver as claimed in claim 9, wherein, transmission and receive channel filter are high Q value filtering devices.
13, multi-mode wireless transceiver as claimed in claim 8, wherein, described control section is a baseband processing unit, and this baseband processing unit is used to handle transmission and the received signal with the corresponding base band of RF signal that sends and receive by the adjustable double multiplexer.
14, multi-mode wireless transceiver as claimed in claim 13, wherein, baseband processing unit sends by serial peripheral interface control and receive channel filters frequency, and also control sends and the frequency acceptance band switch.
15, multi-mode wireless transceiver as claimed in claim 13, wherein, baseband processing unit sends by the control of internal integrated circuit interface and receive channel filters frequency, and also control sends and the frequency acceptance band switch.
16, multi-mode wireless transceiver as claimed in claim 8, wherein, each RX path comprises: low noise amplifier is used for amplifying with the received signal of the frequency acceptance band of the corresponding a plurality of service frequency bands of low noise amplifier; And each transmit path comprises: power amplifier is used for the transmission signal with the transmission frequency band of the corresponding a plurality of service frequency bands of power amplifier is carried out power amplification.
17, multi-mode wireless transceiver as claimed in claim 8 also comprises:
Band pass filter is controlled by external control, thereby filtered bands is corresponding with the current business frequency band;
Import switch, be used for selectively the output of pre-power amplifier on each transmit path and the corresponding pre-power amplifier of current business frequency band being connected to the input of band pass filter; And
Export switch, be used for selectively the power amplifier on each transmit path and the input of the corresponding power amplifier of current business frequency band being connected to the output of band pass filter,
Wherein, each RX path comprises: low noise amplifier is used for amplifying with the received signal of the frequency acceptance band of the corresponding a plurality of service frequency bands of low noise amplifier; Each transmit path comprises: pre-power amplifier, be used for the transmission signal with the transmission frequency band of the corresponding a plurality of service frequency bands of pre-power amplifier is carried out pre-power amplification, power amplifier, be used for the transmission signal with the transmission frequency band of the corresponding a plurality of service frequency bands of power amplifier is carried out power amplification, and control section, be used to control band pass filter, input and output switch with corresponding with the current business frequency band.
18, multi-mode wireless transceiver as claimed in claim 17, wherein, band pass filter, input and output switch are integrated on the microelectromechanical systems.
19, multi-mode wireless transceiver as claimed in claim 17, wherein, described control section is a baseband processing unit, and this baseband processing unit is used to handle transmission and the received signal with the corresponding base band of RF signal that sends and receive by the adjustable double multiplexer.
20, multi-mode wireless transceiver as claimed in claim 19, wherein, baseband processing unit sends by serial peripheral interface control and receive channel filters frequency, and also control sends and the frequency acceptance band switch.
21, multi-mode wireless transceiver as claimed in claim 19, wherein, baseband processing unit sends by the control of internal integrated circuit interface and receive channel filters frequency, and also control sends and the frequency acceptance band switch.
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| KR1020050075301 | 2005-08-17 | ||
| KR20050075301 | 2005-08-17 | ||
| KR1020050085311 | 2005-09-13 |
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| CN1917685A true CN1917685A (en) | 2007-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2006101157621A Pending CN1917685A (en) | 2005-08-17 | 2006-08-16 | Multi-mode-multi-band wireless transceiver |
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