CN209860895U - Receiver and communication equipment - Google Patents
Receiver and communication equipment Download PDFInfo
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- CN209860895U CN209860895U CN201920366360.1U CN201920366360U CN209860895U CN 209860895 U CN209860895 U CN 209860895U CN 201920366360 U CN201920366360 U CN 201920366360U CN 209860895 U CN209860895 U CN 209860895U
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Abstract
The application discloses a receiver and communication equipment, wherein the receiver at least comprises an antenna, a first filter, a first amplifier and a demodulator which are sequentially connected, and the antenna is used for receiving radio frequency signals; the first filter is used for filtering the radio frequency signal; the first amplifier is used for amplifying the filtered radio frequency signal; the demodulator is used for demodulating the amplified radio frequency signal to obtain a baseband signal; one end of a first capacitor and one end of a first resistor in the first filter are connected to the antenna, the other end of the first capacitor is connected with one end of a second capacitor, the other end of the second capacitor and one end of a second resistor are connected to the first amplifier, the other end of the first resistor is connected with the other end of the second resistor, one end of a third resistor is connected with the other end of the first capacitor, the other end of the third resistor is grounded, one end of the third capacitor is connected with the other end of the first resistor, and the other end of the third capacitor is grounded. By the mode, the method and the device can eliminate the interference signal and improve the conversation quality of the narrow-band analog channel talkback.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a receiver and a communications device.
Background
The broadband and narrowband convergence terminal is influenced by the current convergence technology, and the broadband and narrowband convergence terminal and the current convergence technology are only shared by audio links in principle, such as: the receiver, the loudspeaker, the receiver and the like are shared, the radio frequency links are independent, and the conversion and decoding from the radio frequency to the audio frequency and from the audio frequency to the radio frequency are independent.
The wide-band and narrow-band integrated terminal has different modulation modes, a cellular radio frequency communication system has a Time Division Duplex (TDD) working mode, Time slot intermittent transmission power and periodicity of power transmission, the frequency range is between 200Hz and 320kHz, and the cellular radio frequency communication system is a low-frequency signal and is easily identified by human ears. While the narrow-band Frequency Modulation (FM) is analog communication, which is a simple Frequency Division Multiple Access (FDMA) operation mode, in which a signal is transmitted or received for a long time.
The inventors of the present application have found in long-term development that when a narrowband analog channel in a wideband-narrowband convergence terminal is in talk, while the wideband (camping on 2G/3G/4G) is in standby mode, a fine periodic "click" sound can be heard by the human ear, which is actually a time-slot interference from the wideband, which is coupled to a narrowband radio frequency receive channel through a narrowband antenna. Although the broadband is in a standby mode, in practice, the broadband is still attached to the network, the broadband has signaling interaction with the base station, idle power detection transmission exists, the power amplifier does not stop working, and only the power is small. Because the narrow-band analog channel is opened, the wide band is standby, and the wide band and the narrow band share the receiver, the periodic time slot component of the wide band is coupled into the narrow-band receiving channel through the antenna and then mixed with the narrow-band analog carrier frequency, so that the component is regularly and periodically changed in the time domain before the narrow-band analog signal enters the demodulator, and finally the 'clicking' sound on the audio is caused.
SUMMERY OF THE UTILITY MODEL
The problem that this application mainly solved provides a receiver and communication equipment, can eliminate interfering signal, improves the speech quality that narrowband analog channel talkbacked.
In order to solve the above technical problem, the present application provides a receiver, where the receiver at least includes: the antenna is used for receiving radio frequency signals; the first filter is connected with the antenna and used for filtering the radio frequency signal; the first amplifier is connected with the first filter and used for amplifying the radio-frequency signals after filtering; the demodulator is connected with the first amplifier and is used for demodulating the amplified radio-frequency signal to obtain a baseband signal; the first filter comprises a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor and a third resistor, one end of the first capacitor and one end of the first resistor are connected to the antenna, the other end of the first capacitor is connected with one end of the second capacitor, the other end of the second capacitor and one end of the second resistor are connected to the first amplifier, the other end of the first resistor is connected with the other end of the second resistor, one end of the third resistor is connected with the other end of the first capacitor, the other end of the third resistor is grounded, one end of the third capacitor is connected with the other end of the first resistor, and the other end of the third capacitor is grounded.
In order to solve the above technical problem, another technical solution adopted by the present application is to provide a communication device, including at least: the device comprises a first transceiver and a second transceiver which are connected with each other, wherein the first transceiver is used for carrying out broadband data communication, the second transceiver is used for carrying out narrowband voice talkback, and the second transceiver comprises a receiver, wherein the receiver is the receiver.
Through the scheme, the beneficial effects of the application are that: the first filter is added at the front end of the first amplifier, so that a useful signal in a received radio frequency signal passes through the first capacitor and the second capacitor without loss, and simultaneously, the resonant frequency of the first filter falls on an ultralow frequency, and the ultralow frequency signal cannot flow into the ground through the first capacitor and the second capacitor and the first resistor and the third capacitor, so that interference is eliminated, ultralow frequency components in the radio frequency signal can be deeply inhibited, overlapped time slot interference signals are filtered, the influence of the interference signals on the conversation tone quality is prevented, and the conversation quality of the narrowband analog channel talkback is enhanced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of a receiver provided in the present application;
fig. 2 is a schematic structural diagram of another embodiment of a receiver provided in the present application;
FIG. 3 is a schematic diagram of the structure of a first filter, a second filter and a first amplifier in another embodiment of the receiver provided by the present application;
fig. 4 is a schematic structural diagram of an embodiment of a communication device provided in the present application;
FIG. 5 is a waveform diagram of a RF signal received by a prior art receiver;
fig. 6 is a waveform diagram of a radio frequency signal received by a receiver in an embodiment of the communication device provided in the present application;
FIG. 7 is a waveform illustrating scattering parameters in an embodiment of a communication device provided herein;
FIG. 8 is a schematic diagram of another waveform of a scattering parameter in an embodiment of a communication device provided herein;
fig. 9 is a schematic diagram of a smith chart in an embodiment of a communication device provided by the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a receiver provided in the present application, where the receiver at least includes: an antenna 11, a first filter 12, a first amplifier 13 and a demodulator 14.
The antenna 11 is used for receiving radio frequency signals; the first filter 12 is connected to the antenna 11 and is configured to filter the radio frequency signal; the received radio frequency signal may be accompanied by a plurality of interference signals, wherein one of the interference signals is a timeslot interference signal, and the embodiment utilizes a resistance-capacitance network composed of a resistor and a capacitor to filter the timeslot interference signal.
Specifically, the first filter 12 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, and a third resistor R3.
One end of a first capacitor C1 and one end of a first resistor R1 are connected to the antenna 11, and the other end of the first capacitor C1 is connected to one end of a second capacitor C2; the other end of the second capacitor C2 and one end of the second resistor R2 are connected to the first amplifier 13, and the other end of the first resistor R1 is connected to the other end of the second resistor R2; one end of the third resistor R3 is connected with the other end of the first capacitor C1, and the other end of the third resistor R3 is grounded; one end of the third capacitor C3 is connected to the other end of the first resistor R1, and the other end of the third capacitor C3 is grounded.
The first amplifier 13 is connected to the first filter 12, and is configured to amplify the filtered radio frequency signal; specifically, the first amplifier 13 is connected to the other end of the second capacitor C2 and one end of the second resistor R2.
The demodulator 14 is connected to the first amplifier 13, and is configured to demodulate the amplified radio frequency signal to obtain a baseband signal; the first amplifier 13 may be a low noise amplifier, and may use a mixer to convert the frequency of the amplified rf signal, so as to obtain a baseband signal.
A first filter is added at the front end of the first amplifier 13, ultra-low frequency components in the radio frequency signals are deeply inhibited, and superposed time slot interference components are filtered; the capacitance values of the first capacitor C1, the second capacitor C2 and the third capacitor C3 may be several to several hundred pF, the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 may be several to several hundred M Ω, the capacitance values and the resistance values may be adjusted according to specific situations, so that a useful signal in a received radio frequency signal passes through the first capacitor C1 and the second capacitor C2 without loss, while the resonance frequency of the first filter falls on an ultra-low frequency (near direct current), the frequency of the ultra-low frequency signal is within a recognizable range of human ears, and since the capacitors have the function of passing high-frequency low-frequency, the ultra-low frequency signal cannot pass through the first capacitor C1 and the second capacitor C2, and flows into the ground through the first resistor R1 and the third capacitor C3 to be absorbed by the ground, thereby achieving interference elimination.
By arranging the first filter 12 between the first amplifier 13 and the antenna 11, the interference signal in the received radio frequency signal is filtered, the influence of the interference signal on the conversation tone quality is prevented, and the conversation quality of the narrow-band analog channel conversation is enhanced.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of a receiver provided in the present application, where the receiver at least includes: an antenna 11, a first filter 12, a first amplifier 13, a demodulator 14, a second filter 15 and a third filter 16.
The connection of the antenna 11, the first filter 12, the first amplifier 13 and the demodulator 14 is similar to that in the above embodiments, and is not described herein again.
The second filter 15 is connected to the first amplifier 13, and the second filter 15 is used for further filtering an interference signal in the amplified radio frequency signal; the third filter 16 is connected to the second filter 15, the third filter 16 is used for further filtering the radio frequency signal, and the third filter 16 may be an RC filter.
Further, the circuit structure of the second filter 15 is the same as that of the first filter 12, as shown in fig. 3, two ends of the first amplifier are respectively connected to the first filter 12 and the second filter 15, the input end Sin is connected to the antenna, and the output end Sout is connected to the third filter 16; the second filter 15 includes a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
One end of a fourth capacitor C4 and one end of a fourth resistor R4 are connected to the first amplifier 13, and the other end of the fourth capacitor C4 is connected to one end of a fifth capacitor C5; the other end of the fifth capacitor C5 and one end of the fifth resistor R5 are connected to the third filter 16, and the other end of the fourth resistor R4 is connected to the other end of the fifth resistor R5; one end of a sixth resistor R6 is connected with the other end of the fourth capacitor C4, and the other end of the sixth resistor R6 is grounded; one end of the sixth capacitor C6 is connected to the other end of the fourth resistor R4, and the other end of the sixth capacitor C6 is grounded.
The demodulator 14 includes a first mixer 141, a first local oscillator 142, a first attenuator 143, and an intermediate frequency processor chip 144.
The first local oscillator 142 is connected to the first attenuator 143 for generating a first local oscillation signal; the first attenuator 143 is configured to attenuate the received first local oscillation signal to obtain a second local oscillation signal; the first mixer 141 is respectively connected to the first attenuator 143, the third filter 16, and the if processor chip 144, and configured to mix the second local oscillation signal with the rf signal to obtain a first signal; the if processor chip 144 is configured to process the first signal to obtain a baseband signal.
In this embodiment, the second mixing is used to demodulate the radio frequency signal into a baseband signal, and first the first mixer 141 is used to mix the second local oscillation signal with the radio frequency signal filtered by the third filter 16, so that the frequency of the radio frequency signal is reduced to become a first signal, and the first down-conversion is implemented; the first signal is then processed by the if processor chip 144 to obtain a baseband signal, which is then down-converted for a second time.
Further, as shown in fig. 2, in order to filter the interference signal in the first signal and amplify the first signal, a sixth filter 145 and a second amplifier 146 are disposed between the first mixer 141 and the intermediate frequency processor chip 144, which are connected to each other.
The sixth filter 145 is connected to the first mixer 141, and is configured to filter the first signal to obtain a second signal; the second amplifier 146 is configured to amplify the second signal to obtain a third signal.
The if processor chip 144 includes a second attenuator 1441, a second mixer 1442, a third amplifier 1443, a second local oscillator 1444, and a synthesizer 1445.
A second attenuator 1441 is connected to the second amplifier 146 for attenuating the third signal into a fourth signal; the synthesizer 1445 is connected to the second local oscillator 1444 for generating a fifth signal; the second local oscillator 1444 is connected to the third amplifier 1443, and is configured to generate a third local oscillation signal according to the fifth signal; the third amplifier 1443 is configured to amplify the third local oscillation signal to generate a fourth local oscillation signal; the second mixer 1442 is connected to the second attenuator 1441 and the third amplifier 1443, respectively, and is configured to mix the fourth signal with the fourth local oscillation signal to obtain a baseband signal.
The second mixer 1442 is used to realize aliasing of the fourth local oscillation signal and the fourth signal, so that the second down-conversion is realized, a baseband signal is finally generated, and demodulation of the radio frequency signal is realized.
With continued reference to fig. 2, the if processor chip 144 may further include an analog-to-digital converter 1446 and a seventh filter 1447, wherein the analog-to-digital converter 1446 is connected to the second mixer 1442 for converting the baseband signal into a digital signal; a seventh filter 1447 is connected to the analog-to-digital converter 1446 for filtering the digital signal, the seventh filter 1447 being a digital filter, which in a specific embodiment may be a decimation filter.
In addition, the receiver may further include a fourth filter 17, a switch 18, and a fifth filter 19 connected in this order; the fourth filter 17 is used for filtering out a high-frequency signal in the radio-frequency signal, and the fourth filter 17 may be a low-pass filter; a switch 18 is used to connect the fourth filter 17 and the fifth filter 19, specifically, when the transmitting and receiving signals share one antenna 11, the switch 18 is used to switch the narrow-band transmitting and receiving signals, the switch 18 is closed to transmit the signals, the switch 18 is closed to receive the signals, or the switch 18 is closed to receive the signals, and the switch 18 is opened to transmit the signals; the fifth filter 19 is used for filtering the radio frequency signal, and the fifth filter 19 may be an RC filter.
By arranging the first filter 12 and the second filter 15 at two ends of the first amplifier 13, the first filter 12 and the second filter 15 can inhibit near zero frequency components, so that intermediate frequency and high frequency signals pass through, time slot interference signals mixed in radio frequency signals can be filtered, the radio frequency signals basically pass without loss, and rectangular waves can be smoothed; and performs secondary frequency conversion using the first mixer 141 and the second mixer 1442 so that the radio frequency signal is demodulated into a baseband signal, so that there is no time slot interference signal in the received baseband signal.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of a communication device provided in the present application, where the communication device 40 at least includes: a first transceiver 41 and a second transceiver 42 connected to each other.
The first transceiver 41 is used for broadband data communication, and the first transceiver 41 may be a broadband transceiver; the second transceiver 42 is used for performing narrowband speech talkback, the second transceiver 42 may be a narrowband transceiver, and the second transceiver 42 includes the receiver 421, where the receiver is the receiver in the above embodiment.
In a specific embodiment, two wideband and narrowband integrated terminals are used for communication test, when the wideband transceivers are in standby, the narrowband transceivers use analog channels to communicate with each other, an audio link is opened, fine 'click' sound can be heard on a loudspeaker in a quiet environment, and a time slot interference rectangular wave peak on a receiver receiving signal can be tested by using a frequency spectrograph, as shown in fig. 5, the time slot interference rectangular wave peak superposed on a radio frequency signal can be seen; with the receiver provided in the present application, the radio frequency signal is relatively smooth in the time domain, as shown in fig. 6, it can be seen that the time slot interference rectangular peak on the radio frequency signal is greatly suppressed.
In order to ensure that the rf signal passes through the first filter 12 and the second filter 15 without loss, as shown in fig. 2, and has no influence on the receiving sensitivity of the narrowband receiver, simulation is performed by using electronic Design Automation (ADS) software, and simulation results shown in fig. 7 to 9 are obtained.
The scattering parameters (S-parameters) include the reflection coefficient S11 and the forward transmission coefficient S21 of the input port, and their characteristic curves are shown in fig. 7 and 8, and it can be seen from the results shown in fig. 8 that the frequency rejection is greater than 45dB for signals with frequencies below 50KHz and less than 0.189dB for signals with frequencies above 76 MHz.
As shown in fig. 9, the smith chart of the reflection coefficient S11 shows that the characteristic impedance Z0 is 50 Ω, and as can be seen from the chart, the impedance point below 1MHz approaches the open point of the smith chart (the impedance at the open point is infinite), the loss is infinite, the impedance above 75MHz approaches 50 Ω, and the loss approaches 0.
The conducted receiving sensitivity of the receiver is obtained through testing, and compared with the prior art, the testing result shown in the following table is obtained:
from the results in the above table, it can be seen that the sensitivity of the receiver in the present application is basically consistent with that in the prior art, but the present application can filter the timeslot interference signal while not affecting the receiving sensitivity, so that the conversation tone quality of the narrow-band analog channel is better.
The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.
Claims (10)
1. A receiver, characterized in that it comprises at least:
an antenna for receiving a radio frequency signal;
the first filter is connected with the antenna and used for filtering the radio frequency signal;
the first amplifier is connected with the first filter and used for amplifying the radio-frequency signals after filtering;
the demodulator is connected with the first amplifier and is used for demodulating the amplified radio-frequency signal to obtain a baseband signal;
the first filter comprises a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor and a third resistor, one end of the first capacitor and one end of the first resistor are connected to the antenna, the other end of the first capacitor is connected with one end of the second capacitor, the other end of the second capacitor and one end of the second resistor are connected to the first amplifier, the other end of the first resistor is connected with the other end of the second resistor, one end of the third resistor is connected with the other end of the first capacitor, the other end of the third resistor is grounded, one end of the third capacitor is connected with the other end of the first resistor, and the other end of the third capacitor is grounded.
2. The receiver of claim 1,
the receiver further comprises a second filter and a third filter, wherein the second filter is connected with the first amplifier, the second filter is used for further filtering interference signals in the amplified radio-frequency signals, the third filter is connected with the second filter, and the third filter is used for further filtering the radio-frequency signals;
wherein a circuit structure of the second filter is the same as a circuit structure of the first filter.
3. The receiver of claim 1,
the receiver further comprises a fourth filter, a switch and a fifth filter which are sequentially connected, wherein the fourth filter is used for filtering high-frequency signals in the radio-frequency signals, the switch is used for connecting the fourth filter with the fifth filter, and the fifth filter is used for filtering the radio-frequency signals.
4. The receiver of claim 3,
the fourth filter is a low-pass filter, and the fifth filter is an RC filter.
5. The receiver of claim 1,
the demodulator comprises a first mixer, a first local oscillator, a first attenuator and an intermediate frequency processor chip; the first local oscillator is connected to the first attenuator and configured to generate a first local oscillation signal, the first attenuator is configured to attenuate the received first local oscillation signal to obtain a second local oscillation signal, the first mixer is respectively connected to the first attenuator, the first amplifier, and the intermediate frequency processor chip and configured to mix the second local oscillation signal with the radio frequency signal to obtain a first signal, and the intermediate frequency processor chip is configured to process the first signal to obtain the baseband signal.
6. The receiver of claim 5,
the demodulator further includes a sixth filter and a second amplifier connected to each other, the sixth filter being connected to the first mixer and configured to filter the first signal to obtain a second signal, and the second amplifier being configured to amplify the second signal to obtain a third signal.
7. The receiver of claim 6,
the intermediate frequency processor chip comprises a second attenuator, a second mixer, a third amplifier, a second local oscillator and a synthesizer;
wherein the second attenuator is connected to the second amplifier for attenuating the third signal into a fourth signal; the synthesizer is connected with the second local oscillator and used for generating a fifth signal; the second local oscillator is connected to the third amplifier, and is configured to generate a third local oscillation signal according to the fifth signal, and the third amplifier is configured to amplify the third local oscillation signal to generate a fourth local oscillation signal; the second mixer is connected to the second attenuator and the third amplifier, respectively, and configured to mix the fourth signal with the fourth local oscillation signal to obtain the baseband signal.
8. The receiver of claim 7,
the intermediate frequency processor chip further comprises an analog-to-digital converter and a seventh filter, wherein the analog-to-digital converter is connected with the second mixer and used for converting the baseband signal into a digital signal, and the seventh filter is connected with the analog-to-digital converter and used for filtering the digital signal.
9. The receiver of claim 8,
the seventh filter is a decimation filter.
10. A communication device comprising at least a first transceiver and a second transceiver connected to each other, the first transceiver being for wideband data communication and the second transceiver being for narrowband voice intercom, the second transceiver comprising a receiver, wherein the receiver is a receiver according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920366360.1U CN209860895U (en) | 2019-03-21 | 2019-03-21 | Receiver and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920366360.1U CN209860895U (en) | 2019-03-21 | 2019-03-21 | Receiver and communication equipment |
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| CN209860895U true CN209860895U (en) | 2019-12-27 |
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| CN201920366360.1U Active CN209860895U (en) | 2019-03-21 | 2019-03-21 | Receiver and communication equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021164430A1 (en) * | 2020-02-21 | 2021-08-26 | 京东方科技集团股份有限公司 | Transmitting antenna system, receiving antenna system, and communication device |
| CN114629513A (en) * | 2020-12-09 | 2022-06-14 | 海能达通信股份有限公司 | Receiving circuit, absorption filter, and receiver |
-
2019
- 2019-03-21 CN CN201920366360.1U patent/CN209860895U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021164430A1 (en) * | 2020-02-21 | 2021-08-26 | 京东方科技集团股份有限公司 | Transmitting antenna system, receiving antenna system, and communication device |
| CN114629513A (en) * | 2020-12-09 | 2022-06-14 | 海能达通信股份有限公司 | Receiving circuit, absorption filter, and receiver |
| CN114629513B (en) * | 2020-12-09 | 2024-03-15 | 海能达通信股份有限公司 | Receiving circuit, absorption filter and receiver |
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