CN204119223U - Multichannel full-duplex amplitude modulation wide band radio-frequency transceiver - Google Patents
Multichannel full-duplex amplitude modulation wide band radio-frequency transceiver Download PDFInfo
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- CN204119223U CN204119223U CN201420275091.5U CN201420275091U CN204119223U CN 204119223 U CN204119223 U CN 204119223U CN 201420275091 U CN201420275091 U CN 201420275091U CN 204119223 U CN204119223 U CN 204119223U
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Abstract
The utility model discloses a kind of multichannel full-duplex amplitude modulation wide band radio-frequency transceiver, comprise the radiating circuit of at least two transmitting paths and the receiving circuit of a receiving path.Radio frequency transceiver emitting structural of the present utility model adopts twice up-conversion structure to amplify to reach in broadband emission spectrum more well by base band, the first intermediate frequency, the second intermediate frequency multiple-stage filtering, receiving path adopts a down-conversion super heterodyne architectures, eliminate image interference, reduce the complexity of circuit simultaneously as far as possible, make receiver have good receptivity and also have good stability and lower cost simultaneously.
Description
Technical field
The utility model belongs to technical field of RFID, relates to a kind of radio frequency transceiver, is specifically related to and a kind of multichannel amplitude modulation broadband great dynamic range transceiver.
Background technology
Nowadays, radio circuit has boundless application market.No matter be civilian or military, wireless communication technology profoundly facilitates the innovation of human communication mode, and along with the continuous lifting of communication system information capacity, radio-frequency technique is in wireless communications in occupation of very important status.
Meanwhile, along with people to the performance of radio communication and the requirement of stability more and more higher, radio-frequency module in radio communication has become the focus of current research, as: honeycomb fashion personal communication and base station, wireless access system, GPS (Global Position System), WLAN (wireless local area network), satellite communication etc.Radio-frequency module in radio communication directly has influence on the overall performance of communication system, the requirement of modern wireless communication systems radio frequency front end not only comprises that volume is little, lightweight, low-work voltage, low-power consumption, circuit structure are compact, and is proposed higher requirement to the spectrum mask transmitted, receiving sensitivity, transmitter frequency dynamic range.
Summary of the invention
In order to solve the problems referred to above that prior art exists, the present invention on the domestic and international radio-frequency transceiver system of research and related circuit design basis, and in conjunction with practical application, proposes a kind of multichannel full-duplex wide band radio-frequency transceiver.
Concrete technical scheme of the present invention is: a kind of multichannel full-duplex amplitude modulation wide band radio-frequency transceiver, comprises the radiating circuit of at least two transmitting paths and the receiving circuit of a receiving path.Here transceiver operational is at radio frequency band, and tranmitting frequency resolution high frequency bandwidth, power control accuracy high dynamic range is large, and receiving path image frequency degree of suppression is high, and Received signal strength dynamic range is large.
Described radiating circuit comprises frequency source and transmitting path, frequency source is by first order frequency source, second level frequency source, third level frequency source forms, first order frequency source provides local oscillation signal for modulation circuit, second, twice up-conversion that three grades of frequency sources are transmitting path provides local oscillation signal, three grades of local vibration sources adopt same reference source signal to export three road signals by one point of three power splitter to divide that to be clipped to three grades of frequency sources for referencial use, first an impedance transformation is done by voltage follower after transmitting path receives the baseband signal of input, modulator is outputted to and first order local vibration source signal is modulated by follower, first time up-conversion is carried out at first frequency mixer and second level local vibration source signal after signal after modulation carries out amplification filtering, the signal of emission band is obtained with the mixing in second frequency mixer of third level local vibration source signal after the intermediate-freuqncy signal exported carries out filter and amplification, signal by the cascade circuit of electrically controlled attenuator and power amplifier as output,
Further, receiving circuit comprises frequency source and receiving path, first by image-reject filter filtering image interference signal after described receiving path access signal, filtered signal makes the signal of the power power change received be fixed on certain power level by automatic gain control circuit under, in frequency mixer, down-conversion is carried out with frequency source signal after the signal that automatic gain control circuit exports is amplified to higher power by amplifier, signal after down-conversion obtains intermediate-freuqncy signal by amplification filtering, intermediate-freuqncy signal goes out baseband signal by the detection of diode envelope detecting circuit, as the output of receiving path.
The beneficial effects of the utility model: receive-transmit system of the present utility model comprises at least two transmitting paths and a receiving path, can realize full duplex work, each path can work independently also can simultaneously co-ordination, is widely used, uses flexibly.Concrete, emitting structural adopts twice up-conversion structure to amplify to reach in broadband emission spectrum more well by base band, the first intermediate frequency, the second intermediate frequency multiple-stage filtering, receiving path adopts a down-conversion super heterodyne architectures, eliminate image interference, reduce the complexity of circuit simultaneously as far as possible, make receiver have good receptivity and also have good stability and lower cost simultaneously.
Accompanying drawing explanation
Fig. 1 is the radio frequency transceiver project organization schematic diagram of the utility model embodiment.
Fig. 2 is the transceiver circuit diagram of the utility model embodiment.
Fig. 3 is the transceiver circuit diagram of the utility model embodiment.
Fig. 4 is that the modulator of the utility model embodiment meets follower circuit figure.
Fig. 5 is the up-conversion filter circuit figure of the utility model embodiment.
Fig. 6 is the power control circuit figure of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
The utility model proposes a kind of multichannel full-duplex broadband great dynamic range amplitude modulated radio frequency transceiver design, concrete schematic diagram as shown in Figure 1, comprises the radiating circuit of at least two transmitting paths and the receiving circuit of a receiving path.Here transceiver operational is at radio frequency band, and tranmitting frequency resolution high frequency bandwidth, power control accuracy high dynamic range is large, and receiving path image frequency degree of suppression is high, and Received signal strength dynamic range is large.
Radiating circuit as shown in Figure 2, comprise frequency source and transmitting path two large divisions, frequency source is made up of first order frequency source, second level frequency source, third level frequency source, first order frequency source provides local oscillation signal for modulation circuit, twice up-conversion that second and third grade of frequency source is transmitting path provides local oscillation signal, and three grades of local vibration sources adopt same reference source signal to export three road signals by one point of three power splitter to divide that to be clipped to three grades of frequency sources for referencial use.First an impedance transformation is done by voltage follower after transmitting path receives the baseband signal of input, modulator is outputted to and first order local oscillation signal is modulated by follower, first time up-conversion is carried out at first frequency mixer and second level local vibration source signal after signal after modulation carries out amplification filtering, the intermediate-freuqncy signal exported obtains the signal of emission band with the mixing in second frequency mixer of third level local oscillation signal after obtaining the frequency band that needs by filter and amplification simultaneously power reaches certain level, signal reaches the controlled of power output by the cascade circuit of electrically controlled attenuator and power amplifier, output reaches last output spectrum substantially without spuious after adopting and broadband signal being divided into some sub-band filtering.
Receiving path as shown in Figure 3, comprise frequency source and receiving path two large divisions, first by image-reject filter filtering image interference signal after receiving path access signal, filtered signal makes the signal of the power power change received be fixed on certain power level by automatic gain control circuit under, in frequency mixer, down-conversion is carried out with frequency source signal after the signal that automatic gain control circuit exports is amplified to higher power by amplifier, signal after down-conversion obtains the stable intermediate-freuqncy signal of waveform good power by amplification filtering, intermediate-freuqncy signal goes out baseband signal by the detection of diode envelope detecting circuit, obtain the output of receiving path.
In transmitting path, first order local vibration source and second level local vibration source need to export fixed frequency value, and circuit all adopts PLL frequency source structure; Third level frequency source will meet broadband after second time up-conversion and the high requirement of frequency resolution, therefore adopts DDS+PLL frequency source structure.PLL frequency source structure and DDS+PLL frequency source structure can be considered as the state of the art, and concrete structure is not described in detail.
As shown in Figure 4, first the baseband signal being input to transmitting path makes the signal of access do an impedance transformation by voltage follower, and isolation external port, signal is buffered to the input of modulator by follower.Modulation circuit connects after first order local vibration source signal is modulated to lower frequency to baseband signal and carries out power amplification and filtering.
As shown in Figure 5, filtered signal and second level local oscillation signal carry out first time up-conversion by frequency mixer, because baseband signal is lower, mixed signal enters higher frequency range, needs to access after the very high SAW filter of Q value carries out intermediate frequency filtering in second frequency mixer, to carry out second time up-conversion with third level local oscillation signal.Reach high-resolution wideband by the signal after the frequency conversion function of third level local vibration source and high frequency resolution make second time up-conversion to export.
As shown in Figure 6, the signal that second time up-conversion exports makes transmitter can export the power signal of great dynamic range by power amplifier circuit and electrically controlled attenuator circuit, and by selecting the high electrically controlled attenuator of control precision to make, power control accuracy is high, error is little simultaneously.Broadband signal is sent into different band-pass filter groups by radio-frequency (RF) switch and is carried out by being divided into different narrow-bands the interference signal that filtering introduced by frequency mixer and power amplifier etc.
The signal that receiving path receives is broadband signal, and local vibration source will meet certain frequency conversion function and also need higher frequency resolution to meet the selection requirement to channel simultaneously.Therefore frequency source adopts DDS+PLL circuit structure.
Receiving circuit adopts super heterodyne architectures, selects high intermediate frequency, by input stage band pass filter filtering image interference signal.Because the signal received can with the change of communication physical condition, can there is larger scope in the signal power therefore accessed, the signal automatic gain of great dynamic range is controlled to fixing power level by automatic gain control circuit AGC by receiving circuit.Power amplifier circuit is carried out and band pass filter circuit carries out signal behavior to the signal accessed and power controls after the signal exported and local oscillation signal downconvert to higher intermediate frequency by frequency mixer.Intermediate-freuqncy signal goes out baseband signal by the detection of diode envelope detecting circuit, then carries out shaping to reach the digital baseband signal of rule by comparator circuit to diode detection signal.
The utility model is integrated with at least two transmitting paths and a receiving path on above radiating circuit and receiving circuit, the full duplex work of transceiver can be realized, and each path both can work independently also can simultaneously co-ordination, be widely used, operating state is controlled flexibly.
Claims (2)
1. a multichannel full-duplex amplitude modulation wide band radio-frequency transceiver, is characterized in that, comprises the radiating circuit of at least two transmitting paths and the receiving circuit of a receiving path;
Described radiating circuit comprises frequency source and transmitting path, frequency source is by first order frequency source, second level frequency source, third level frequency source forms, first order frequency source provides local oscillation signal for modulation circuit, second, twice up-conversion that three grades of frequency sources are transmitting path provides local oscillation signal, three grades of local vibration sources adopt same reference source signal to export three road signals by one point of three power splitter to divide that to be clipped to three grades of frequency sources for referencial use, first impedance transformation is done by voltage follower after transmitting path receives the baseband signal of input, then modulator is outputted to by follower and first order local vibration source signal is modulated, first time up-conversion is carried out at first frequency mixer and second level local vibration source signal after signal after modulation carries out amplification filtering, the signal of emission band is obtained with the mixing in second frequency mixer of third level local vibration source signal after the intermediate-freuqncy signal exported carries out filter and amplification, signal by the cascade circuit of electrically controlled attenuator and power amplifier as output.
2. multichannel full-duplex amplitude modulation wide band radio-frequency transceiver according to claim 1, it is characterized in that, receiving circuit comprises frequency source and receiving path, first by image-reject filter filtering image interference signal after described receiving path access signal, filtered signal makes the signal of the power power change received be fixed on certain power level by automatic gain control circuit under, the signal that automatic gain control circuit exports is amplified afterwards by amplifier and frequency source signal carries out down-conversion in frequency mixer, signal after down-conversion obtains intermediate-freuqncy signal by amplification filtering, intermediate-freuqncy signal goes out baseband signal by the detection of diode envelope detecting circuit, as the output of receiving path.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420275091.5U CN204119223U (en) | 2014-05-27 | 2014-05-27 | Multichannel full-duplex amplitude modulation wide band radio-frequency transceiver |
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| CN201420275091.5U CN204119223U (en) | 2014-05-27 | 2014-05-27 | Multichannel full-duplex amplitude modulation wide band radio-frequency transceiver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017219954A1 (en) * | 2016-06-20 | 2017-12-28 | 深圳市华讯星通讯有限公司 | Communication transceiver |
| CN107888226A (en) * | 2017-12-28 | 2018-04-06 | 浙江中智海通信科技有限公司 | Radio communication is the same as frequency while full duplex receiver frequency domain framework and signal acceptance method |
| CN109462408A (en) * | 2018-12-18 | 2019-03-12 | 北京无线电测量研究所 | A kind of integrated receiving and transmitting front end of multichannel VHF double conversion |
| CN114614771A (en) * | 2022-01-25 | 2022-06-10 | 电子科技大学 | Ultra-wideband radio frequency power amplifier based on frequency continuous adjustment |
-
2014
- 2014-05-27 CN CN201420275091.5U patent/CN204119223U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017219954A1 (en) * | 2016-06-20 | 2017-12-28 | 深圳市华讯星通讯有限公司 | Communication transceiver |
| CN107888226A (en) * | 2017-12-28 | 2018-04-06 | 浙江中智海通信科技有限公司 | Radio communication is the same as frequency while full duplex receiver frequency domain framework and signal acceptance method |
| CN109462408A (en) * | 2018-12-18 | 2019-03-12 | 北京无线电测量研究所 | A kind of integrated receiving and transmitting front end of multichannel VHF double conversion |
| CN114614771A (en) * | 2022-01-25 | 2022-06-10 | 电子科技大学 | Ultra-wideband radio frequency power amplifier based on frequency continuous adjustment |
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