CN116260472A - Broadband transmitting module based on 180-degree bridge - Google Patents
Broadband transmitting module based on 180-degree bridge Download PDFInfo
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- CN116260472A CN116260472A CN202211533731.3A CN202211533731A CN116260472A CN 116260472 A CN116260472 A CN 116260472A CN 202211533731 A CN202211533731 A CN 202211533731A CN 116260472 A CN116260472 A CN 116260472A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
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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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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Transmitters (AREA)
Abstract
The invention discloses a broadband transmitting module based on a 180-degree bridge, which comprises: a local oscillator cancellation circuit comprising: the local oscillation 180-degree bridge divides the local oscillation signal into power and outputs a normal phase local oscillation signal and an opposite phase local oscillation signal; the mixer is used for mixing the normal phase local oscillation signal and the input intermediate frequency signal to generate a radio frequency signal; and the radio frequency 180-degree bridge is used for summing the radio frequency signal with the inverse local oscillation signal so as to offset the local oscillation leakage component in the radio frequency signal from the inverse component with equal amplitude. According to the technical scheme, the 180-degree bridge is matched with the mixer or the phase shifter, so that local oscillation leakage components in radio frequency signals generated after mixing and inverse local oscillation components with equal amplitude are offset, the inhibition degree of the transmitting module on local oscillation leakage in output radio frequency signals is improved, a low-stray broadband transmitting module with good flatness is realized, and the guarantee is provided for the purity of broadband frequency spectrum of the transmitting module.
Description
Technical Field
The present invention relates to the field of radio frequency systems. And more particularly to a broadband transmission module based on a 180 ° bridge.
Background
The broadband transmitting module can be used in a receiving and transmitting component of a radio frequency system, up-converts an intermediate frequency signal into a radio frequency signal, and pushes signal power to a saturated state to be transmitted. The broadband characteristics of the broadband transmitting module are represented by the intermediate frequency bandwidth and the local oscillation bandwidth, the technical difficulty is that the radio frequency band after the up-conversion of the intermediate frequency and the local oscillation is close to the local oscillation working frequency, the rectangular coefficient of the band-pass filter is non-ideal, the roll-off from the passband to the cut-off sideband is limited, and the band-pass filter can inhibit the near-end local oscillation signal which is close to the radio frequency band while passing the radio frequency, so that the output signal has a small local oscillation leakage component. The transmitting module is mature and applied to the radio frequency system for many years, and the bandwidth of the transmitting module is limited to a large extent due to the problem of local oscillator leakage.
Besides the traditional filter and the trap filter are used for restraining the local oscillation leakage component of the output signal of the transmitting module, a 180-degree bridge (180-degree Hybrid) can be used for local oscillation cancellation. The roll-off of the traditional filter is limited, and the inhibition degree of the local oscillation is insufficient; the trap has a larger rejection to the local oscillator signal, but has poorer passband flatness in the broadband signal, especially when the local oscillator signal is close to the radio frequency signal. Therefore, in the broadband transmitting module, the 180-degree bridge is adopted to invert the leaked local oscillation signals and then to do the summation, so that the leakage signal components are largely counteracted, and the local oscillation cancellation function is realized.
Disclosure of Invention
The invention aims to provide a broadband transmitting module based on a 180-degree bridge aiming at the defects of the traditional filter and the wave trap.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a broadband transmission module based on a 180 ° bridge, comprising:
a local oscillator cancellation circuit comprising:
the local oscillation 180-degree bridge divides the local oscillation signal into power and outputs a normal phase local oscillation signal and an opposite phase local oscillation signal;
the mixer is used for mixing the normal phase local oscillation signal and the input intermediate frequency signal to generate a radio frequency signal;
and the radio frequency 180-degree bridge is used for summing the radio frequency signal with the inverse local oscillation signal so as to offset the in-phase local oscillation leakage component in the radio frequency signal from the inverse component with equal amplitude.
Preferably, the broadband transmitting module comprises a local oscillation amplifying circuit for amplifying the input local oscillation signal to an undersaturated state and a radio frequency amplifying circuit for amplifying the radio frequency signal output by the local oscillation canceling circuit to a saturated state.
Preferably, the local oscillation amplifying circuit includes: first amplifier and attenuator
The local oscillation signal is amplified by a first amplifier and is output to the second attenuator;
and after the local oscillation signal is amplified, the second attenuator adjusts the power of the signal entering the mixer and outputs the power to a local oscillation 180-degree bridge in the local oscillation cancellation circuit.
Preferably, the local oscillation cancellation circuit further includes: the second frequency mixer is used for mixing the first frequency signals,
the local oscillation 180-degree bridge divides local oscillation signal power output by the local oscillation amplifying circuit into two paths;
the first path generates an in-phase local oscillation signal and outputs the in-phase local oscillation signal to a first mixer, and the first mixer mixes the in-phase local oscillation signal with the intermediate frequency input signal and sends the in-phase local oscillation signal to a radio frequency 180-degree bridge;
the second path generates an opposite-phase local oscillation signal and outputs the opposite-phase local oscillation signal to a second mixer or a phase shifter, and the second mixer sends the opposite-phase local oscillation signal to a radio frequency 180-degree bridge through the same path of frequency conversion of the same-phase local oscillation signal, keeping the consistency of the phase change amount and the amplitude change amount.
Preferably, the inverted local oscillator signal is 180 ° out of phase with the in-phase signal.
Preferably, the first mixer is configured to mix the intermediate frequency input signal with an in-phase local oscillator signal, and up-convert the intermediate frequency input signal to generate a radio frequency signal.
Preferably, the intermediate frequency input end of the second mixer is connected with load matching, so that the phase difference between the output inverted local oscillation signal and the in-phase local oscillation leakage signal in the radio frequency signal is kept 180 degrees in phase and the amplitude is consistent.
Preferably, the local oscillation cancellation circuit further includes: a phase shifter and a third attenuator;
the phase shifter is used for shifting the phase of the opposite phase local oscillation signal output by the local oscillation 180-degree bridge, so that the phase shift is consistent with the phase offset of the same phase local oscillation signal after frequency conversion, and the phase imbalance of the 180-degree bridge is compensated, so that the phase difference of the output opposite phase local oscillation signal and the leaked same phase local oscillation signal after up-conversion is more accurately kept at 180-degree in phase;
and the third attenuator is used for adjusting the amplitude of the anti-phase local oscillation signal and the leaked in-phase local oscillation signal to be consistent.
Preferably, the local oscillator cancellation circuit may be selectively operable to process the inverted local oscillator signal by welding to the phase shifter or the second mixer.
Preferably, the radio frequency amplifying circuit includes:
the switch filter bank is used for carrying out frequency division filtering on the radio frequency signal output by the local oscillation cancellation circuit;
the second amplifier is used for amplifying the radio frequency signal filtered by the switch filter bank to a saturated state;
the coupler is used for coupling the saturated radio frequency signal amplified by the second amplifier to a detector of the power supply control circuit;
and the isolator is used for isolating the input of the reverse signal, so that the broadband transmitting module meets the requirements of unidirectional transmission and low-output standing waves.
Preferably, the broadband transmitting module further comprises a power supply control circuit, which is used for providing a control signal for the frequency division filtering of the radio frequency amplifying circuit and is also used for detecting and monitoring the transmitting signal of the radio frequency amplifying circuit.
Preferably, the power supply control circuit includes:
a first voltage regulator block (LDO) for filtering and secondarily regulating the input power signal to a required operating voltage value of the first amplifier;
the driver is used for driving the input control signal, increasing load current and providing a control signal for frequency division filtering of the radio frequency amplifying circuit;
and the detector is used for carrying out power detection on the coupling signal output by the radio frequency amplifying circuit.
Preferably, the power supply control circuit further includes: and the second voltage stabilizing block (LDO) is used for filtering and secondarily stabilizing the input power supply signal to an operating voltage value required by the second amplifier.
The beneficial effects of the invention are as follows:
according to the technical scheme, the 180-degree bridge is matched with the mixer or the phase shifter to finish up-conversion, local oscillator leakage components in the radio frequency signals are offset with equal-amplitude opposite-phase components, the suppression of near-end local oscillator leakage in the output radio frequency signals by the transmitting module is improved, low-stray broadband design with good flatness is realized, and guarantee is provided for broadband spectrum purity of the transmitting module.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 shows a schematic diagram of a broadband transmission module according to the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to the preferred embodiment and fig. 1. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
At present, various schemes exist for dividing an operating frequency band into a plurality of sections and carrying out filtering processing in sections, but due to the limited roll-off of a traditional band-pass filter, the scheme cannot solve the problem of local oscillator leakage close to the operating frequency band, so that stray indexes of output signals of a transmitting module are deteriorated, the flatness near a stop band range of a wave trap is poor, and the band-pass filter is limited in broadband application.
Therefore, the invention adopts 180-degree bridge combined mixer or phase shifter to offset the local oscillation leakage component in the radio frequency signal and the phase inversion component with equal amplitude, thereby improving the suppression of the near-end local oscillation leakage in the output radio frequency signal by the transmitting module and leading the broadband transmitting module to have the advantages of flat output power and low local oscillation leakage.
A broadband transmission module based on a 180 ° bridge, comprising:
a local oscillator cancellation circuit comprising:
the local oscillation 180-degree bridge divides the local oscillation signal into power and outputs a normal phase local oscillation signal and an opposite phase local oscillation signal;
the mixer is used for mixing the normal phase local oscillation signal and the input intermediate frequency signal to generate a radio frequency signal;
and the radio frequency 180-degree bridge is used for summing the radio frequency signal with the inverse local oscillation signal so as to offset the in-phase local oscillation leakage component in the radio frequency signal from the inverse component with equal amplitude.
Preferably, the broadband transmitting module comprises a local oscillation amplifying circuit for amplifying the input local oscillation signal to an undersaturated state and a radio frequency amplifying circuit for amplifying the radio frequency signal output by the local oscillation canceling circuit to a saturated state.
Preferably, the local oscillation amplifying circuit includes: first amplifier and attenuator
The local oscillation signal is amplified by a first amplifier and is output to the second attenuator;
and after the local oscillation signal is amplified, the second attenuator adjusts the power of the signal entering the mixer and outputs the power to a local oscillation 180-degree bridge in the local oscillation cancellation circuit.
Preferably, the local oscillation cancellation circuit further includes: the second frequency mixer is used for mixing the first frequency signals,
the local oscillation 180-degree bridge divides local oscillation signal power output by the local oscillation amplifying circuit into two paths;
the first path generates an in-phase local oscillation signal and outputs the in-phase local oscillation signal to a first mixer, and the first mixer mixes the in-phase local oscillation signal with the intermediate frequency input signal and sends the in-phase local oscillation signal to a radio frequency 180-degree bridge;
the second path generates an opposite-phase local oscillation signal and outputs the opposite-phase local oscillation signal to a second mixer or a phase shifter, and the second mixer sends the opposite-phase local oscillation signal to a radio frequency 180-degree bridge through the same path of frequency conversion of the same-phase local oscillation signal, keeping the consistency of the phase change amount and the amplitude change amount.
Preferably, the inverted local oscillator signal is 180 ° out of phase with the in-phase signal.
Preferably, the first mixer is configured to mix the intermediate frequency input signal with an in-phase local oscillation signal, and up-convert the intermediate frequency input signal to a radio frequency signal;
preferably, the intermediate frequency input end of the second mixer is connected with load matching, so that the output anti-phase local oscillation signal and the in-phase radio frequency signal keep 180 DEG phase difference in phase and consistent in amplitude.
The load includes, but is not limited to, a resistor, a chip, and the like.
Preferably, the local oscillation cancellation circuit further includes: a phase shifter and a third attenuator;
the phase shifter is used for shifting the phase of the opposite phase local oscillation signal output by the local oscillation 180-degree bridge, so that the phase shift is consistent with the phase offset of the same phase local oscillation signal after frequency conversion, and the phase imbalance of the 180-degree bridge is compensated, so that the phase difference of the output opposite phase local oscillation signal and the leaked same phase local oscillation signal after up-conversion is more accurately kept at 180-degree in phase;
and the third attenuator is used for adjusting the amplitude of the anti-phase local oscillation signal and the leaked in-phase local oscillation signal to be consistent.
Preferably, the local oscillator cancellation circuit may selectively process the inverted local oscillator signal by welding to the phase shifter or the second mixer.
Preferably, the radio frequency amplifying circuit includes:
the switch filter bank is used for carrying out frequency division filtering on the radio frequency signal output by the local oscillation cancellation circuit;
the second amplifier is used for amplifying the radio frequency signal filtered by the switch filter bank to a saturated state;
the coupler is used for coupling the saturated radio frequency signal amplified by the second amplifier to a detector of the power supply control circuit;
and the isolator is used for isolating the input of the reverse signal, so that the broadband transmitting module meets the requirements of unidirectional transmission and low-output standing waves.
Preferably, the broadband transmitting module further comprises a power supply control circuit, which is used for providing a control signal for the frequency division filtering of the radio frequency amplifying circuit and is also used for detecting and monitoring the transmitting signal of the radio frequency amplifying circuit.
Preferably, the power supply control circuit includes:
a first voltage regulator block (LDO) for filtering and secondarily regulating the input power signal to a required operating voltage value of the first amplifier;
the driver is used for driving the input control signal, increasing load current and providing a control signal for frequency division filtering of the radio frequency amplifying circuit;
and the detector is used for carrying out power detection on the coupling signal output by the radio frequency amplifying circuit.
Preferably, the power supply control circuit further includes: and the second voltage stabilizing block (LDO) is used for filtering and secondarily stabilizing the input power supply signal to an operating voltage value required by the second amplifier.
In particular in one embodiment of the present invention,
a broadband transmission module based on a 180 ° bridge comprising: the device comprises an intermediate frequency input, a local oscillation amplifying circuit, a local oscillation cancellation circuit, a radio frequency amplifying circuit and a power supply control circuit. The local oscillation amplifying circuit comprises an amplifier and an attenuator; the local oscillation cancellation circuit comprises a local oscillation 180-degree bridge (180-degree Hybrid), a mixer with load or a phase shifter and a radio frequency 180-degree bridge; the radio frequency amplifying circuit comprises an amplifier, a switch filter bank, a coupler and an isolator; the power supply control circuit comprises an LDO voltage stabilizing block, a driver and a detector.
Preferably, the local oscillation cancellation circuit includes:
the local oscillation 180-degree bridge divides local oscillation signals output by the local oscillation amplifying circuit into two paths, wherein one path generates in-phase local oscillation signals, and the in-phase local oscillation signals enter the first mixer and are mixed with the intermediate frequency input signals to generate radio frequency signals; the other path of the local oscillation signals generates opposite-phase local oscillation signals, and the phase difference between the opposite-phase local oscillation signals and the phase difference between the same-phase local oscillation signals and the phase difference between;
a first mixer for mixing the intermediate frequency input signal with an in-phase local oscillation signal and up-converting the intermediate frequency input signal to a radio frequency signal;
the phase shifter shifts the phase of the opposite phase local oscillation signal output by the local oscillation 180-degree bridge, so that the phase shift is consistent with the phase offset of the in-phase local oscillation signal after frequency conversion, and the phase imbalance of the 180-degree bridge is compensated, so that the phase difference of the output opposite phase local oscillation signal and the leaked in-phase local oscillation signal after up-conversion is more accurately kept at 180-degree in phase; an attenuator is added to adjust the opposite phase local oscillation signals and the leaked in-phase local oscillation signals to keep consistent in amplitude;
and the second mixer is used for enabling the inverted local oscillation signal output by the local oscillation 180-degree bridge to pass through the same path of frequency conversion of the same-phase local oscillation signal, keeping the consistency of the phase and amplitude change amount, so that the output inverted local oscillation signal and the leaked same-phase local oscillation after up-conversion are kept consistent in amplitude and opposite in phase. The intermediate frequency input end of the mixer is connected with a 50 ohm load;
the radio frequency 180-degree bridge performs power summation on the radio frequency signal output by the first mixer and the inverted local oscillation leakage signal output by the phase shifter or the second mixer, so that local oscillation leakage components in the radio frequency signal are counteracted by the inverted components, and the near-end local oscillation leakage suppression of the output radio frequency signal by the broadband transmitting module is realized.
After the intermediate frequency signal is input through the attenuator, the intermediate frequency signal enters the first mixer of the local oscillation cancellation circuit as a small signal lower than-10 dBm. After the local oscillation signal is amplified by a first amplifier in the local oscillation amplifying circuit, the input standing wave of the frequency mixing is reduced by an attenuator, and then the input standing wave enters the difference end (delta) of a local oscillation 180-degree bridge in the local oscillation cancellation circuit.
The sum end (sigma) of a local oscillation 180-degree bridge in the local oscillation cancellation circuit is connected with a 50 ohm load, the difference end (delta) divides local oscillation signal power input by the local oscillation amplification circuit into two paths, and a first path ch1 is an in-phase local oscillation signal and enters a first mixer to be mixed with the intermediate frequency input signal to generate a radio frequency signal; the second channel ch2 is an inverted local oscillation signal, and is 180 degrees out of phase with the in-phase signal entering the first mixer.
The ch1 in-phase local oscillation signal enters a first mixer and is up-converted to a radio frequency signal with an intermediate frequency input signal; the ch2 anti-phase local oscillation signal keeps consistent with the change amount of the in-phase local oscillation signal in phase and amplitude through a phase shifter (welding point B) or a second mixer (welding point A) by selecting welding points; finally, the two paths of signals respectively enter the ch1 end and the ch2 end of the radio frequency 180-degree bridge, the difference end (delta) of the radio frequency 180-degree bridge is connected with a 50 ohm load, and the sum end (sigma) outputs the power sum signals of the two paths of input signals ch1 and ch2, namely the radio frequency signals for local oscillation cancellation.
The switch filter group in the radio frequency amplifying circuit performs sectional filtering on the broadband radio frequency signal output by the radio frequency 180-degree bridge and the end (sigma) in the local oscillation cancellation circuit, the filtered radio frequency signal enters the second amplifier, and the output power is pushed to saturation. The saturated output signal is coupled and output to the detector of the power supply control circuit through the coupler, and the coupler through signal is output and transmitted after passing through the isolator.
The LDO in the power supply control circuit is used for secondarily stabilizing the voltage of the input direct current and supplying power to the first amplifier of the local oscillation amplifying circuit and the second amplifier of the radio frequency amplifying circuit; the driver enhances the load capacity of the drive input control signal and controls the switch in the segmented filter bank; and the detector carries out power detection on the coupled output signal in the radio frequency amplifying circuit to finish the power monitoring of the output signal.
The wideband transmitting module of the invention adopts 180-degree bridge to complete up-conversion by matching with the mixer or the phase shifter, counteracts local oscillation leakage component in the radio frequency signal and phase inversion component with equal amplitude, promotes the transmitting module to restrain the local oscillation leakage of the output radio frequency signal, realizes low stray wideband design with good flatness, and overcomes the defects of limited roll-off and insufficient restraining degree of the local oscillation leakage of the traditional filter; the trap operates in a narrow band, and is limited by poor pass band flatness of the broadband signal.
In the description of the present invention, it should be noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. A broadband transmission module based on a 180 ° bridge, comprising:
a local oscillator cancellation circuit comprising:
the local oscillation 180-degree bridge divides the local oscillation signal into power and outputs a normal phase local oscillation signal and an opposite phase local oscillation signal;
the mixer is used for mixing the normal phase local oscillation signal and the input intermediate frequency signal to generate a radio frequency signal;
and the radio frequency 180-degree bridge is used for summing the radio frequency signal with the inverse local oscillation signal so as to offset the in-phase local oscillation leakage component in the radio frequency signal from the inverse component with equal amplitude.
2. The broadband transmission module of claim 1, wherein the broadband transmission module comprises: the radio frequency amplifying circuit is used for amplifying the input local oscillation signals to the undersaturated state and amplifying the radio frequency signals output by the local oscillation cancellation circuit to the saturated state.
3. The wideband transmission module of claim 2 wherein the local oscillator amplification circuit comprises: first amplifier and attenuator
The local oscillation signal is amplified by the first amplifier and is output to the second attenuator;
and after the local oscillation signal is amplified, the second attenuator adjusts the power of the signal entering the mixer and outputs the power to a local oscillation 180-degree bridge in the local oscillation cancellation circuit.
4. The wideband transmission module of claim 1 wherein the local oscillator cancellation circuit further comprises: the second frequency mixer is used for mixing the first frequency signals,
the second mixer transmits the inverted local oscillation signal to a radio frequency 180-degree bridge through the same path of frequency conversion of the same-phase local oscillation signal, so that the phase and amplitude change quantity are kept consistent, and the phase of the inverted local oscillation signal is 180 degrees different from that of the same-phase local oscillation signal.
5. The wideband transmission module of claim 1 wherein the local oscillator cancellation circuit further comprises: a phase shifter and a third attenuator;
the phase shifter is used for shifting the phase of the opposite phase local oscillation signal output by the local oscillation 180-degree bridge, so that the phase shift is consistent with the phase offset of the same phase local oscillation signal after frequency conversion, and the phase imbalance of the 180-degree bridge is compensated, so that the phase difference of the output opposite phase local oscillation signal and the leaked same phase local oscillation signal after up-conversion is more accurately kept at 180-degree in phase;
the third attenuator is used for adjusting the amplitude of the opposite phase local oscillation signal to be consistent with that of the leaked in-phase local oscillation signal.
6. The wideband transmit module of claim 4 wherein the intermediate frequency input of the second mixer is load matched such that the output inverted local oscillator signal is 180 ° out of phase and consistent in amplitude with the in-phase radio frequency signal.
7. The broadband transmission module of claim 2, wherein the radio frequency amplification circuit comprises:
the switch filter bank is used for carrying out frequency division filtering on the radio frequency signal output by the local oscillation cancellation circuit;
the second amplifier is used for amplifying the radio frequency signal filtered by the switch filter bank to a saturated state;
and the isolator is used for isolating the input of the reverse signal, so that the broadband transmitting module meets the requirements of unidirectional transmission and low-output standing waves.
8. The broadband transmission module of claim 1, wherein the broadband transmission module further comprises: the power supply control circuit is used for providing control signals for the frequency division filtering of the radio frequency amplifying circuit and detecting and monitoring the transmitting signals of the radio frequency amplifying circuit.
9. The broadband transmission module of claim 8, wherein the power control circuit comprises:
the first voltage stabilizing block is used for stabilizing the input power supply signal to the working voltage value required by the local oscillation amplifying circuit;
the driver is used for driving the input control signal, increasing load current and providing a control signal for frequency division filtering of the radio frequency amplifying circuit;
and the detector is used for carrying out power detection on the coupling signal output by the radio frequency amplifying circuit.
10. The broadband transmission module of claim 9, wherein the power control circuit further comprises: and the second voltage stabilizing block is used for stabilizing the input power supply signal to the working voltage value required by the second amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211533731.3A CN116260472A (en) | 2022-12-02 | 2022-12-02 | Broadband transmitting module based on 180-degree bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211533731.3A CN116260472A (en) | 2022-12-02 | 2022-12-02 | Broadband transmitting module based on 180-degree bridge |
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| CN116260472A true CN116260472A (en) | 2023-06-13 |
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| CN202211533731.3A Pending CN116260472A (en) | 2022-12-02 | 2022-12-02 | Broadband transmitting module based on 180-degree bridge |
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