CN1093705C - Method and apparatus for receiving communication signals - Google Patents
Method and apparatus for receiving communication signals Download PDFInfo
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- CN1093705C CN1093705C CN 98100547 CN98100547A CN1093705C CN 1093705 C CN1093705 C CN 1093705C CN 98100547 CN98100547 CN 98100547 CN 98100547 A CN98100547 A CN 98100547A CN 1093705 C CN1093705 C CN 1093705C
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- 238000004891 communication Methods 0.000 title claims abstract description 41
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- 238000010586 diagram Methods 0.000 description 9
- 238000001914 filtration Methods 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 6
- 230000001413 cellular effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The present invention discloses a method and an apparatus for receiving communication signals, which can make a communication device operate in multiple wave bands, and can be used for supplying a mixer by the operation of a combined filter in local oscillation injected frequency of multiple wave band, by eliminating the need of a mixer for each wave band. Consequently, the duplexing and matching requirements to the mixer input are simplified and the signal loss is minimized. In addition, the input impedance matching of the mixer is designed to match the impedance for received signals in each wave band, an RF band rejection filter at an IF frequency is provided. The output match of the mixer is designed to match the impedance of an IF filter, and a low impedance to an RF input frequency is provided.
Description
The present invention relates generally to communicator, more specifically, relate to the method and apparatus of receiving communication signal.
With the increase that radio communication device uses, the frequency spectrum shortage that becomes.In many cases, on a concrete wave band, provide the network operation person of service to have to provide service, to satisfy its user at discrete wave band.For example, in the 900MHz frequency band, provide the network operation person of service to have to rely on the DCS system of 1800MHz frequency band on the gsm system.Therefore must communicate by letter in two frequencies even the 3rd system such as PCS1900 as the communicator of cellular radio.This requirement that operates in two or more frequencies produces many problems.For example, if receiver is included in the discrete parts of received signal in each wave band, communicator will increase size and cost.
The method and apparatus that the purpose of this invention is to provide receiving communication signal in one group of wave band minimizes the increase of parts simultaneously.
The invention provides communicator, be used at one group of RF wave band receiving communication signal, described communicator comprises:
Antenna circuit is to receive described signal of communication in described one group of RF wave band;
First passage is coupled to described antenna circuit, with the RF wave band receiving communication signal at described one group of RF wave band;
First filter, the first input end that is coupled to described first passage is arranged, to receive the described signal of communication and second input at described first wave band, to receive fixing oscillator frequency, described first filter is useful on first output that produces first output signal;
Second channel is coupled to described antenna circuit, with the 2nd RF wave band receiving communication signal at described one group of RF wave band;
Second filter has the 3rd input that is coupled to described second channel, and to receive described signal of communication and four-input terminal at described the 2nd RF wave band, to receive described fixing oscillator frequency, described second filter produces second output; With
Frequency mixer, be coupled described first filter and described second filter are to make up described first output signal and described second output signal.
The invention provides the method that is used for from one group of wave band receiving communication signal, described method comprises step:
Be coupling in signal of communication in first wave band to the first input end of first filter;
The fixing oscillator frequency of coupling arrives second input of described first filter;
Produce first output of described first filter;
Be coupling in signal of communication in second wave band to the first input end of second filter;
The described fixing oscillator frequency that is coupled arrives second input of described second filter;
Produce second output of described second filter;
Mix described first output and described second output.
Method and apparatus all needs frequency mixer by avoiding all wave bands, and enabled communication devices runs in the multiband, as GSM900MHz, DCS1800MHz and PCS1900MHz.For example, in two waveband GSM/DCS1800 radio telephone, local oscillator (LO) injected frequency that is used for GSM and DCS wave band is supplied to frequency mixer by the use of junction filter.Therefore, duplex and the coupling to the frequency mixer input requires to be simplified the loss of tool minimum signal.Combination RX/LO filter, one is used for a GSM and DCS wave band, has been designed RX and LO input port and general RX/LO output port.The input that the general output port of GSM RX/LO junction filter and DCS RX/LO junction filter is all received frequency mixer.Because the duplex between RX and the LO injected frequency requires to be finished by junction filter, to the two waveband communicator, circuit design is reducing to 2 to the quantity of the duplexing line of frequency mixer from 6, and to the triband communicator, the circuit design handle reduces to 4 to the quantity of the duplexing line of frequency mixer from 10.In addition, the input impedance matching of frequency mixer is designed, and with the Signal Matching impedance that is used for receiving at each wave band, and provides RF band stop filter in the IF frequency.The output circuit of ultimately mixing device provides to the Low ESR of RF incoming frequency with to the coupling of IF filter input.
Advantage of the present invention is to avoid all using frequency mixer at all wave bands, the loss of tool minimum signal.The signal impedance that receives in each wave band of the input impedance matching of frequency mixer, the impedance of IF filter is mated in the output of frequency mixer, and the Low ESR to the RF incoming frequency is provided.
Accompanying drawing is simply described
Fig. 1 is the block diagram according to communicator of the present invention;
Fig. 2 is the block diagram according to the receiver 127 of Fig. 1 of the present invention;
Fig. 3 is the schematic diagram according to frequency mixer 234 of the present invention;
Fig. 4 is the block diagram according to the receiver 127 of Fig. 1 of another embodiment of the present invention;
Fig. 5 is the schematic diagram according to the frequency mixer 234 of another embodiment of the present invention.
The invention depicted in greater detail
Now translate into Fig. 1, the block diagram of realizing the radio communication device as cellular radio of the present invention is shown.In preferred embodiments, frame generator ASIC 101 is as the CMOS ASIC that can obtain from motorola inc, with microprocessor 103, as the 68HC11 that also can obtain from motorola inc, combination is used for moving at cellular system to produce necessary communication protocol.Microprocessor 103 usefulness comprise the memory 104 of RAM105, EEPROM107 and ROM109, preferred consolidation is in an encapsulation 111, produce the essential step of agreement and carry out other function that is used for radio communication device to carry out, as writing to display 113, receiving information, accept I/O information, control frequency synthesizer 125 or carry out the necessary step of the method according to this invention amplifying signal by connector 116 according to the present invention from keypad 115.ASIC 101 handles by microphone 117 with to the audio frequency by voicefrequency circuit 119 conversion of loud speaker 121.
Transceiver is handled radiofrequency signal.Particularly, transmitter 123 is launched by the carrier frequency that frequency synthesizer 125 produces by antenna 129 usefulness.The information that is received by the antenna 129 of communicator enters receiver 127, and it is used for from the carrier frequency demodulation character of frequency synthesizer 125.Communicator comprises message receiver and alternatively comprising the storage device 130 of digital signal processing device.Message receiver and storage device can be, for example, and digital answering machine or paging receiver.
Now translate into Fig. 2, the block diagram that is used for the wireless telephonic receiver 127 of two waveband according to the present invention is shown.The RF signal that is received by antenna 129 is coupled to the match circuit 201 that comprises RF coupling frame 202 and the 2nd RF coupling frame 204.The RF match circuit is designed to provide the suitable resistance coupling based on the frequency of the signal that receives to receiver.Then, the RF signal is coupled to the duplexer 206 by 208 controls of duplexer control circuit.Duplexer control enables the RF signal and is received and emission by the annex that is coupled to communicator by connector 210.For example, the hand-free kit that is used for enabling at car and boat hands-free operation can be coupled to connector 210 according to the present invention.
Then, provide the one group passage of the RF signal of reception by line 212 to receiver.That is, according to the wave band number that communicator can be used, each wave band is provided discrete passage.Particularly, line 212 is coupled to the transmission line 214 that the RF signal is provided to first filter 216.For example, filter 216 can be the logical ceramic filters of three limit bands, as preselection filter.For example, ceramic filter can be by tuning with the RF signal by 935 and 960MHz in the GSM receiving wave range.Then, filtering signal is transferred to prime amplifier 218.Preferably, prime amplifier 218 comprises enable line 220, is used to enable or can not prime amplifier.Preferably, the enable line oxide-semiconductor control transistors is to isolate frequency mixer from transmitter energy and other parasitic frequency.The output of prime amplifier 218 is coupled to the first input end 224 of junction filter 222, in the transmission line 230 coupling LO injected frequencies of second input 226 by being coupled to voltage controlled oscillator 228.For example, in first passage, 935～965MHz and LO that the ceramic filter of combination can receive in the GSM wave band inject 720～745MHz.The general output 232 of filter 222 is coupled to frequency mixer 234 by transmission line 236.
Line 212 also is coupled to the 2nd RF passage by the transmission line 240 that is coupled to second filter 242.Second filter 242 also can be the logical ceramic filters of three limit bands, for example, and as preselection filter.The output of second filter 242 is coupled to second prime amplifier 244.Preferably, prime amplifier 244 also has enable line 280, to isolate frequency mixer from transmitter energy and other harmonic frequency.The output of prime amplifier 244 is coupled to the 3rd input 248 of second junction filter 246.Junction filter 246 also is coupled, to receive the LO frequency in the 4th input 250 by transmission line 252.The output 254 of combination also is coupled to frequency mixer 234 by transmission line 256.As among Fig. 3 with depicted in greater detail, frequency mixer 234 produces intermediate frequency (IF) signals in output 258.The IF signal of preferred 215MHz is provided for filter 260, as the SAW band pass filter.
Now translate into Fig. 3, the circuit diagram of the frequency mixer 234 of Fig. 2 is shown.Frequency mixer 234 is designed, and running on the two waveband radio telephone, as is fit to run on the phone of DCS1800MHz and GSM900.The frequency mixer input circuit is designed, with 50 ohm of all wave bands couplings, and filtering output 215MHz IF signal.Similarly, the frequency mixer output circuit is designed pair match circuit of 215MHz filter and broadband band line LC rejector circuit with filtering input rf signal (to each wave band), is used to optimize the frequency mixer performance.Particularly, the output signal of junction filter is coupled to the inductance 302 of frequency mixer 234.Inductance is coupled to ground by electric capacity 304 and is coupled to the base stage 310 of transistor 308.Inductance 312 also is coupled to base stage 310.Inductance 302 and electric capacity 304 are selected with electric capacity 306 and inductance 312, to be provided at the RF coupling of frequency mixer input.That is, select their value, think that the wave band of each reception such as 900MHz and 1800MHz provide 50 ohmages.Though available within the scope of the invention other value, inductance 302 preferred about 3.3 nanohenrys (nH), electric capacity 304 about 0.5 pico farads (pF), electric capacity 306 about 2pF and inductance 312 about 5.6nH.
The collector electrode 314 of transistor 308 is coupled to the transmission line 318 that is coupled to ground by electric capacity 320.Collector electrode 314 also is coupled to electric capacity 322, it by inductance 324 be coupled to filter 260.At last, inductance 326 is coupling in collector electrode 314 and is coupled between the resistance 332 of inductance 312, and electric capacity 322 and inductance 326 are selected, so that the impedance of coupling IF filter 260 to be provided.The value of band line 318 and electric capacity 320 is selected, to provide the LC rejector circuit with filtering RF input signal, is used to optimize the frequency mixer performance.Particularly, select these values, pass through filter 260 to prevent the RF signal, and provide clean IF signal to filter 260 to provide Low ESR at output.For the two waveband radio telephone that receives 900MHz and 1800MHzRF signal, band line 318 is preferred wide about 0.02 inch, is about 0.35 inch, and about 3nH induction reactance is provided.Electric capacity 320 preferred 4.7pF electric capacity, simultaneously, inductance 326 about 27nH.
At last, frequency mixer is designed, so that the IF coupling to filter 260 to be provided.Inductance 326 and electric capacity 322 are by preferred, to provide Low ESR to the IF of frequency mixer frequency.For 215MHz IF frequency, electric capacity 322 about 33pF, inductance 326 about 27nH.Similarly, the IF band stop filter is provided, and is fed back to transistor 308 to prevent intermediate frequency.Particularly, the 334 pairs of IF signals of electric capacity that are coupling between inductance 312 and the ground provide band stop filter.For 215MHz IF frequency, inductance 312 about 5.6nH, electric capacity 334 about 68pF.
In the triband radio telephone, other RF passage can be provided, be used for received signal from third communication system.For example, communicator also can be suitable for receiving the PCS1900 signal.Particularly, among Fig. 4, line 212 can be coupled to the 3rd RF level by the transmission line 451 and 414 that is coupled to filter 416.For example, filter 416 can be the logical ceramic filters of three limit bands, as preselection filter.Ceramic filter can be passed through the RF signal with 1930～1990MHz in the PCS1900 receiving wave range by tuning.Then, the signal of filtering is transferred to prime amplifier 418.Preferably, prime amplifier 418 comprises enable line 420, is used to enable or can not prime amplifier.Preferably, the enable line oxide-semiconductor control transistors is to isolate frequency mixer from transmitter energy and other parasitic frequency.The output of prime amplifier 418 is coupled to the 5th input 424 of junction filter 422, at the 6th input 426 by transmission line 430 that is coupled to voltage controlled oscillator 228 and 452 coupling LO injected frequencies.The array output 432 of filter 422 is coupled to frequency mixer 234 by transmission line 436 and 453.Though illustrated three grades among the present invention, based on the quantity of the network that is access in, can as required with other level.
Now translate into Fig. 5, the circuit diagram of the frequency mixer 234 of Fig. 4 is shown.Frequency mixer is designed to operate in GSM900MHz, DCS1800MHz and PCS1900MHz frequency range in the triband radio telephone.The frequency mixer input is designed to mate at 50 ohm in all three frequency ranges, and filtering output 215MHz IF signal.Similarly, the frequency mixer output circuit is designed the match circuit and the broadband band line LC rejector circuit of 215MHz filter, with filtering input rf signal (being used for all tribands), is used to optimize the frequency mixer performance.Here, no longer repeat among Fig. 4 and Fig. 5 with Fig. 2 and Fig. 3 in same remainder and the function of those parts.
Described the present invention though above reach figure, should know, this only provides example, does not exceed true spirit of the present invention and scope, and those skilled in the art can make a large amount of improvement and modification.For example, though described particular radio telephone system, can use the present invention as other system of EGSM with specific receiving wave range.Though the present invention has concrete application in portable cellular phone, the present invention can be used for any portable unit, comprises beep-pager, electronic organizers or computer.The present invention is limited by following claim.
Claims (9)
1. communicator is used at one group of RF wave band receiving communication signal, and described communicator comprises:
Antenna circuit is to receive described signal of communication in described one group of RF wave band;
First passage is coupled to described antenna circuit, with the RF wave band receiving communication signal at described one group of RF wave band;
First filter, the first input end that is coupled to described first passage is arranged, to receive the described signal of communication and second input at described first wave band, to receive fixing oscillator frequency, described first filter is useful on first output that produces first output signal;
Second channel is coupled to described antenna circuit, with the 2nd RF wave band receiving communication signal at described one group of RF wave band;
Second filter has the 3rd input that is coupled to described second channel, and to receive described signal of communication and four-input terminal at described the 2nd RF wave band, to receive described fixing oscillator frequency, described second filter produces second output; With
Frequency mixer, be coupled described first filter and described second filter are to make up described first output signal and described second output signal.
2. communicator as claimed in claim 1, wherein said first passage comprises first filter, with when described signal of communication during at a described RF wave band, by described signal of communication.
3. communicator as claimed in claim 2, wherein said first passage also comprises first amplifier, coupling to be to receive first enable signal, is used for enabling described first passage when described signal of communication during at a described RF wave band.
4. communicator as claimed in claim 1, wherein, described second channel comprises second filter, with when described signal of communication during at described the 2nd RF wave band, by described signal of communication.
5. described communicator as claimed in claim 4, wherein, described second channel also comprises second amplifier, coupling to be to receive second enable signal, is used for enabling described second channel when described signal of communication during at described the 2nd RF wave band.
6. communicator as claimed in claim 1 wherein, also comprises third channel, be coupling between described antenna circuit and the described frequency mixer, described third channel comprises the 3rd filter, with when described signal of communication during at described the 3rd RF wave band, by described signal of communication.
7. communicator as claimed in claim 7, wherein, described third channel also comprises the 3rd amplifier, coupling to be to receive the 3rd enable signal, is used for enabling described third channel when described signal of communication during at described the 3rd RF wave band.
8. communicator as claimed in claim 1, wherein,
First passage comprises first amplifier, and the coupling of described first amplifier to be to receive first enable signal, is used for enabling described first passage when described signal of communication during at a described RF wave band;
Second channel comprises second amplifier, and the coupling of described second amplifier to be to receive second enable signal, is used for enabling described second channel when described signal of communication during at described the 2nd RF wave band.
9. be used for from the method for one group of wave band receiving communication signal, described method comprises step:
Be coupling in signal of communication in first wave band to the first input end of first filter;
Coupling is fixed to second input of oscillator frequency to described first filter;
Produce first output of described first filter;
Be coupling in signal of communication in second wave band to the first input end of second filter;
The described fixing oscillator frequency that is coupled arrives second input of described second filter;
Produce second output of described second filter;
Mix described first output and described second output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100547 CN1093705C (en) | 1998-02-18 | 1998-02-18 | Method and apparatus for receiving communication signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100547 CN1093705C (en) | 1998-02-18 | 1998-02-18 | Method and apparatus for receiving communication signals |
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| Publication Number | Publication Date |
|---|---|
| CN1192613A CN1192613A (en) | 1998-09-09 |
| CN1093705C true CN1093705C (en) | 2002-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 98100547 Expired - Fee Related CN1093705C (en) | 1998-02-18 | 1998-02-18 | Method and apparatus for receiving communication signals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7761078B2 (en) * | 2006-07-28 | 2010-07-20 | Qualcomm Incorporated | Dual inductor circuit for multi-band wireless communication device |
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- 1998-02-18 CN CN 98100547 patent/CN1093705C/en not_active Expired - Fee Related
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| CN1192613A (en) | 1998-09-09 |
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Owner name: MOTOROLA MOBILE CO., LTD Free format text: FORMER OWNER: MOTOROLA INC. Effective date: 20110118 |
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Effective date of registration: 20110118 Address after: Illinois State Patentee after: MOTOROLA MOBILITY, Inc. Address before: Illinois, USA 60196 Patentee before: Motorola, Inc. |
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Effective date of registration: 20160315 Address after: California, USA Patentee after: Google Technology Holdings LLC Address before: Illinois State Patentee before: MOTOROLA MOBILITY LLC |
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Granted publication date: 20021030 Termination date: 20160218 |