CN220544998U - Medium-long distance transmission zero intermediate frequency receiver circuit - Google Patents
Medium-long distance transmission zero intermediate frequency receiver circuit Download PDFInfo
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- CN220544998U CN220544998U CN202420195512.7U CN202420195512U CN220544998U CN 220544998 U CN220544998 U CN 220544998U CN 202420195512 U CN202420195512 U CN 202420195512U CN 220544998 U CN220544998 U CN 220544998U
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- 238000004891 communication Methods 0.000 abstract description 6
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model provides a medium-long distance transmission zero intermediate frequency receiver circuit, which receives: the radio frequency antenna interface is connected with a third receiving and transmitting switching unit through an antenna matching filter, the third receiving and transmitting switching unit is connected with a second receiving and transmitting switching unit through a pre-selection frequency filter and a low noise amplifying circuit, the second receiving and transmitting switching unit is connected with a first receiving and transmitting switching unit through an electric tuning filter, and the first receiving and transmitting switching unit is connected with a digital baseband processing module; transmitting: the digital baseband processing module is connected with the first receiving and transmitting switching unit, the first receiving and transmitting switching unit is connected with the second receiving and transmitting switching unit through the electric tuning filter, the second receiving and transmitting switching unit is connected with the third receiving and transmitting switching unit through the power amplification unit, the band-pass filter and the directional coupler, and the third receiving and transmitting switching unit is connected with the radio frequency antenna interface through the antenna matching filter. The utility model obviously improves the energy of the transmitted signal, the quality of the received signal and the out-of-band anti-interference capability, thereby improving the communication transmission distance and the receiving sensitivity of the receiver.
Description
Technical Field
The utility model relates to the field of communication equipment, in particular to a medium-long distance transmission zero intermediate frequency receiver circuit.
Background
In a radio receiving system, there are two main architectures: super-heterodyne receivers and zero intermediate frequency receivers, both of which can convert a modulated RF signal to a baseband I/Q (in-phase quadrature) signal.
The superheterodyne receiver converts a high frequency signal into a low frequency signal for processing at a low frequency, which is low in cost, and filters a medium frequency signal easily with respect to an RF signal, but requires an additional local oscillator and an RF mixer to convert the signal from RF to IF, which increases the cost of the entire receiver, and further requires a filter to eliminate local oscillation leakage and undesired frequency components to prevent generation of an image frequency, which increases the cost and complexity of the receiver. Whereas in a zero intermediate frequency receiver, which uses the same LO frequency as the transmit RF frequency, the radio frequency modulated signal is directly converted to baseband in I/Q demodulation, which does not require additional components such as LO, mixers, filters, etc., thus reducing cost and complexity of the system and improving the operation of the receiver through a high efficiency high power transmit channel and a high sensitivity low noise factor receive channel.
However, the communication transmission distance and the receiving sensitivity of the existing zero intermediate frequency receiver still cannot meet the requirements, for example, the problems of insufficient communication transmission distance, low receiving sensitivity, poor communication quality and the like caused by too small transmitting power, large receiving path loss, large noise coefficient, poor signal selectivity, severe field environment and the like can be influenced by the strength of the signal.
Disclosure of Invention
In order to solve the problems in the background technology, the utility model provides a medium-long distance transmission zero intermediate frequency receiver circuit.
A medium-to-long range transmission zero intermediate frequency receiver circuit comprising a receive path: the radio frequency antenna interface is connected with a third receiving and transmitting switching unit through an antenna matching filter, the third receiving and transmitting switching unit is connected with a second receiving and transmitting switching unit through a pre-selection frequency filter and a low noise amplifying circuit, the second receiving and transmitting switching unit is connected with a first receiving and transmitting switching unit through an electric tuning filter, and the first receiving and transmitting switching unit is connected with the input end of the digital baseband processing module/beyond-the-horizon module.
Based on the above, the method comprises the steps of: the output end of the digital baseband processing module/beyond-view-range module is connected with a first receiving and transmitting switching unit, the first receiving and transmitting switching unit is connected with a second receiving and transmitting switching unit through an electric tuning filter, the second receiving and transmitting switching unit is connected with a third receiving and transmitting switching unit through a power amplification unit, a band-pass filter and a directional coupler in sequence, and the third receiving and transmitting switching unit is connected with a radio frequency antenna interface through an antenna matching filter.
Based on the above, the power amplification unit comprises a first-stage amplifier, a numerical control attenuator, a second-stage amplifier and a third-stage amplifier which are sequentially cascaded, wherein the input end of the first-stage amplifier is connected with the electric tuning filter through the second transceiver switching unit, and the output end of the third-stage amplifier is connected with the input end of the band-pass filter.
Based on the above, the power amplifier unit further comprises a numerical control attenuator, and the numerical control attenuator is cascaded between the first-stage amplifier and the second-stage amplifier.
Based on the above, the first transceiver switching unit, the second transceiver switching unit, and the third transceiver switching unit are respectively transceiver switching electronic switches.
Based on the above, the low noise amplifying circuit includes a low noise amplifier having a noise factor NF of 1.5dB and an amplifying gain of 15.5dB.
Compared with the prior art, the utility model has substantial characteristics and progress, in particular, the utility model improves the signal quality of the radio frequency signal on the transmission and the reception by sharing the electric tuning filter at the front end of the radio frequency baseband signal transmission and the front end of the radio frequency baseband signal reception, and provides a transmitting channel with high gain, high efficiency and out-of-band noise filtering after the power amplification unit adopts multi-stage amplification and then the band-pass filtering; the front end of the receiving channel adopts a preselection filtering, low noise amplification and electric tuning filtering cascade connection, and provides a receiving channel with high selectivity, low loss, low noise coefficient and high sensitivity; the radio frequency antenna port is provided with a low-loss antenna matching filter, so that the system can be better adapted to the antenna; the whole device remarkably improves the energy of a transmitting signal, the quality of a receiving signal and the out-of-band anti-interference capability, thereby improving the communication transmission distance and the receiving sensitivity of the receiver.
Drawings
Fig. 1 is a schematic block diagram of the structure of the present utility model.
Fig. 2 is a schematic circuit diagram of the power amplifier unit of the present utility model.
Fig. 3 is a schematic circuit diagram of the rf receive front-end circuit of the present utility model.
Fig. 4 is a schematic circuit diagram of the antenna matching filter of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, a medium-to-long distance transmission zero intermediate frequency receiver circuit includes a receive path for receiving a wireless signal and a transmit path for transmitting the wireless signal.
The receiving path: the radio frequency antenna interface is connected with a third receiving and transmitting switching unit through an antenna matching filter, the third receiving and transmitting switching unit is connected with a second receiving and transmitting switching unit through a pre-selection frequency filter and a low noise amplifying circuit, the second receiving and transmitting switching unit is connected with a first receiving and transmitting switching unit through an electric tuning filter, and the first receiving and transmitting switching unit is connected with the input end of the digital baseband processing module/beyond-the-horizon module. The radio frequency antenna interface is used for connecting an antenna and receiving wireless signals, and the radio frequency antenna port is provided with a low-loss antenna matching filter for filtering the received signals, so that the system can be well adapted to the antenna. The front end of the receiving channel adopts a preselection filtering, low noise amplification and electric tuning filtering cascade connection, and provides a receiving channel with high selectivity, low loss, low noise coefficient and high sensitivity. The received wireless signals are filtered, amplified and the like, and then sent to a digital baseband processing module/beyond-the-horizon module for receiving and processing.
The transmit path: the output end of the digital baseband processing module/beyond-view-range module is connected with a first receiving and transmitting switching unit, the first receiving and transmitting switching unit is connected with a second receiving and transmitting switching unit through an electric tuning filter, the second receiving and transmitting switching unit is connected with a third receiving and transmitting switching unit through a power amplification unit, a band-pass filter and a directional coupler in sequence, and the third receiving and transmitting switching unit is connected with a radio frequency antenna interface through an antenna matching filter. The digital baseband processing module/beyond-the-horizon module filters the wireless signal to be transmitted through the electric tuning filter, and then outputs the signal through amplification, filtering and coupling of the power amplification unit, the band-pass filter, the directional coupler and the antenna matching filter, and the signal is transmitted out through an antenna connected with the video antenna interface. The power amplification unit adopts multistage amplification and then carries out band-pass filtering, so that a transmitting channel with high gain, high efficiency and out-of-band noise filtering is provided. An electric tuning filter is shared at the front end of the transmission and the reception of the radio frequency baseband signals, so that the signal quality of the radio frequency signals in the transmission and the reception is improved, and the use quantity and the cost of devices are reduced. In this embodiment, the digital baseband processing module/beyond-view-range module is an existing data processing module, and the model number is NT760-174, which is integrated with the digital baseband processing module and beyond-view-range module at the same time.
Specifically, as shown IN fig. 2, the circuit diagram of the power amplifier unit is that the pa_in end is used to connect to the second transceiver switching unit. The power amplifier adopts a three-stage amplifier cascade connection mode to amplify signals (the model of a primary amplifier chip N13 is ECG003, the model of a secondary amplifier chip V22 is MMRF1015GN, the model of a tertiary amplifier chip N15 is BLF 647P), and a digital control attenuator N14 (the model of PE 43711) is inserted between the primary amplifier and the secondary amplifier to realize the open-loop and closed-loop power control of the power amplifier, so that on one hand, the signals can be properly amplified freely, and on the other hand, the power amplifier state can be monitored in real time, and the self-excitation damage of the power amplifier is avoided.
As shown in FIG. 3, the RF receiving front-end circuit in this embodiment adopts filtering, loss reduction, and other means to improve the quality of the received signal. The signal at the receiving end firstly enters a pre-frequency selection filter N7 with the model of BCLC135-174-1W, the signal is firstly subjected to primary filtering, then is sent to a low noise amplifier N8 (with the model of TQP M9028) to amplify the useful signal, the two most important indexes of the low noise amplifier are noise coefficient and amplification gain, the two indexes are parallel rejection, the selected low noise amplifier in the embodiment is a low noise amplifier with relatively low noise coefficient after the noise coefficient and gain are balanced, the noise coefficient NF is 1.5dB, and the amplification gain is 15.5dB, so that on one hand, the signal loss on a receiving channel is compensated, and on the other hand, the lower noise coefficient is introduced. The received signal is amplified and then is sent into an electric tuning filter for further depth filtering, out-of-band spurious signals are filtered, the electric tuning filter N10 model is BCDF135-174-S3, the selectivity performance of the electric tuning filter at F0+/-10% reaches 20dBc, the far-end inhibition of 2F0 can reach 40dB, the electric tuning filter has strong selectivity, and the quality of signals can be improved to a great extent. The first transceiver switching unit, the second transceiver switching unit and the third transceiver switching unit are respectively transceiver switching electronic switches, in this embodiment, radio frequency switches are used, the model is HMC545E, only the second transceiver switching unit N9 and the first transceiver switching unit N11 are shown in fig. 3, the model of the directional coupler is DC0500W50, and the band-pass filter is an LC filter, similar to fig. 4.
The circuit diagram of the antenna matching filter is shown in fig. 4, in this embodiment, the antenna matching filter adopts a low-cost LC passive filter, and utilizes the 50 ohm impedance matching principle to adapt the signal transmitted or received by the system to the antenna, so that the signal is more completely transmitted or received from the antenna. The ANT end is used for being connected with an antenna, and the T/RX end is used for being connected with a third receiving and transmitting switching unit.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A medium-to-long range transmission zero intermediate frequency receiver circuit comprising a receive path: the radio frequency antenna interface is connected with a third receiving and transmitting switching unit through an antenna matching filter, the third receiving and transmitting switching unit is connected with a second receiving and transmitting switching unit through a pre-selection frequency filter and a low noise amplifying circuit, the second receiving and transmitting switching unit is connected with a first receiving and transmitting switching unit through an electric tuning filter, and the first receiving and transmitting switching unit is connected with the input end of the digital baseband processing module/beyond-the-horizon module.
2. The medium-to-long range transmission zero intermediate frequency receiver circuit of claim 1, comprising a transmit path: the output end of the digital baseband processing module/beyond-view-range module is connected with a first receiving and transmitting switching unit, the first receiving and transmitting switching unit is connected with a second receiving and transmitting switching unit through an electric tuning filter, the second receiving and transmitting switching unit is connected with a third receiving and transmitting switching unit through a power amplification unit, a band-pass filter and a directional coupler in sequence, and the third receiving and transmitting switching unit is connected with a radio frequency antenna interface through an antenna matching filter.
3. The medium-to-long range transmission zero intermediate frequency receiver circuit of claim 2, wherein: the power amplification unit comprises a first-stage amplifier, a numerical control attenuator, a second-stage amplifier and a third-stage amplifier which are sequentially cascaded, wherein the input end of the first-stage amplifier is connected with the electric tuning filter through the second transceiver switching unit, and the output end of the third-stage amplifier is connected with the input end of the band-pass filter.
4. A medium and long range transmission zero intermediate frequency receiver circuit according to claim 3, wherein: the power amplifier unit also comprises a numerical control attenuator, and the numerical control attenuator is cascaded between the primary amplifier and the secondary amplifier.
5. The medium-to-long range transmission zero intermediate frequency receiver circuit of claim 1, wherein: the first transceiver switching unit, the second transceiver switching unit and the third transceiver switching unit are respectively a transceiver switching electronic switch.
6. The medium-to-long range transmission zero intermediate frequency receiver circuit of claim 1, wherein: the low noise amplifying circuit comprises a low noise amplifier, the noise coefficient NF of the low noise amplifier is 1.5dB, and the amplifying gain is 15.5dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420195512.7U CN220544998U (en) | 2024-01-26 | 2024-01-26 | Medium-long distance transmission zero intermediate frequency receiver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420195512.7U CN220544998U (en) | 2024-01-26 | 2024-01-26 | Medium-long distance transmission zero intermediate frequency receiver circuit |
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| CN220544998U true CN220544998U (en) | 2024-02-27 |
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| CN202420195512.7U Active CN220544998U (en) | 2024-01-26 | 2024-01-26 | Medium-long distance transmission zero intermediate frequency receiver circuit |
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- 2024-01-26 CN CN202420195512.7U patent/CN220544998U/en active Active
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