CN116366059A - Radio frequency power synthesis circuit and method - Google Patents
Radio frequency power synthesis circuit and method Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
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- 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
Abstract
The application relates to a radio frequency power synthesis circuit and a method, which belong to the technical field of electronic circuits, and comprise a main amplification module for amplifying a first input signal with a first gain to generate a reference radio frequency signal; amplifying the second input signal by a second gain from the amplifying module to generate a first radio frequency signal; the phase tracking module receives the reference radio frequency signal and the first radio frequency signal, adjusts the phase of the second input signal and generates a second radio frequency signal; the amplitude tracking module receives the reference radio frequency signal and the second radio frequency signal, modulates the amplitude of the second radio frequency signal according to the amplitude difference between the reference radio frequency signal and the second radio frequency signal, generates a third radio frequency signal, inputs the third radio frequency signal as a second input signal to the power synthesis module of the slave amplification module, synthesizes the reference radio frequency signal and the first radio frequency signal, and obtains a synthesized radio frequency signal. The method and the device have the effect of improving the safety of radio frequency power synthesis.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a radio frequency power synthesis circuit and a radio frequency power synthesis method.
Background
The radio frequency power synthesis technology is widely applied to the fields of communication base stations, medical treatment, semiconductors, analyzers and the like, which need to use kw-level radio frequency power.
At present, during radio frequency power synthesis, the output signal of a radio frequency signal source is generally divided into two paths of consistent radio frequency signals by using a power divider, then the two paths of consistent radio frequency signals are respectively input into two amplifiers with consistent performance for power amplification, and finally the amplified radio frequency signals are subjected to power synthesis and output. However, because the electronic components for manufacturing the amplifier have differences, the two amplifiers with identical performance are difficult to obtain, if the power gains are different, the power of the amplified radio frequency signals will generate errors, if the phase delays are different, the phase of the waveform of the amplified radio frequency signals will generate phase deviations, under the condition, the radio frequency power synthesis will cause great power loss, the failure rate of the amplifiers will also be increased, and certain potential safety hazards exist.
Disclosure of Invention
In order to improve the safety of radio frequency power synthesis, the application provides a radio frequency power synthesis circuit and a radio frequency power synthesis method.
In a first aspect, the present application provides a radio frequency power synthesis circuit, which adopts the following technical scheme:
a radio frequency power combining circuit comprising:
the main amplification module is used for amplifying the first input signal RF1 with a first gain to generate a reference radio frequency signal;
the slave amplification module is used for amplifying the second input signal RF2 or the third radio frequency signal with a second gain to generate a first radio frequency signal;
the phase tracking module is used for receiving the reference radio frequency signal and the first radio frequency signal, and adjusting the phase of the second input signal RF2 according to the phase difference between the reference radio frequency signal and the first radio frequency signal to generate a second radio frequency signal;
the amplitude tracking module is used for receiving the reference radio frequency signal and the second radio frequency signal, modulating the amplitude of the second radio frequency signal according to the amplitude difference between the reference radio frequency signal and the second radio frequency signal, generating a third radio frequency signal, and inputting the third radio frequency signal to the slave amplification module;
and the power synthesis module synthesizes the reference radio frequency signal and the first radio frequency signal to obtain a synthesized radio frequency signal OUT.
According to the technical scheme, according to the amplitude difference and the phase difference of the reference radio frequency signal and the first radio frequency signal, the phase tracking module and the amplitude tracking module are utilized to adjust the phase and the amplitude of the second input signal RF2 input to the slave amplifying module respectively, closed loop feedback is formed, the adjusted third radio frequency signal is used as the second input signal RF2 to be input to the slave amplifying module for amplifying, so that the amplitude and the phase of the first radio frequency signal output from the amplifying module are consistent with the amplitude and the phase of the reference radio frequency signal output from the master amplifying module, the first radio frequency signal and the reference radio frequency signal are synthesized, the power loss in the synthesis process is reduced, the failure rate of the master amplifying module and the slave amplifying module is reduced, and the safety of radio frequency signal synthesis is improved.
Optionally, the first gain is smaller than the second gain.
By adopting the technical scheme, the amplification range of the radio frequency signal from the amplification module is enlarged by setting that the first gain is smaller than the second gain, so that the first radio frequency signal output from the amplification module is convenient to adjust to be consistent with the reference radio frequency signal.
Optionally, the phase tracking module includes a phase difference detection circuit, a phase control circuit, and a phase adjustment circuit;
the phase difference detection circuit is used for generating a phase difference between a reference radio frequency signal and a first radio frequency signal, the first phase receiving end is connected with the master amplifying module, and the second phase receiving end is connected with the slave amplifying module;
the phase control circuit responds to the phase difference and outputs a phase control signal, the phase difference receiving end is connected with the phase difference output end of the phase difference detection circuit, and the reference signal receiving end is used for receiving positive polarity voltage +V;
the phase adjusting circuit responds to the phase control signal and adjusts the phase of the second input signal RF2, the phase control signal receiving end is connected with the phase control signal output end of the phase control circuit, the signal output end is connected with the amplitude tracking module, and the signal receiving end is used for accessing the second input signal RF2.
By adopting the technical scheme, the phase difference between the reference radio frequency signal and the first radio frequency signal is acquired by the phase difference detection circuit, and the phase difference is converted into the phase control signal by the phase control circuit, so that the phase adjustment circuit adjusts the phase of the second input signal RF2 according to the phase control signal.
Optionally, the phase control circuit includes an operational amplifier U1.
By adopting the above technical solution, the use of the operational amplifier U1 facilitates the conversion of the phase difference into a voltage signal, i.e. a phase control signal, for adjusting the phase of the second input signal RF2.
Optionally, the phase adjusting circuit includes a first resistor R1 and a varactor D1;
one end of the first resistor R1 is used for being connected with a second input signal RF2, and the other end of the first resistor R1 is connected with the cathode of the varactor diode D1, the phase control receiving end of the phase adjusting circuit and the signal output end of the phase adjusting circuit;
the anode of the varactor diode D1 is grounded.
By adopting the technical scheme, the phase shifter is formed by the first resistor R1 and the varactor diode D1, so that when the input voltages of the phase control receiving ends of the phase adjusting circuit are different, the capacitance values of the varactor diode D1 are different, and the adjustment of the phase of the second input signal RF2 is realized by adjusting the capacitance values.
Optionally, the amplitude tracking module includes a first amplitude detection circuit, a second amplitude detection circuit, an amplitude control circuit, and an amplitude adjustment circuit;
the first amplitude detection circuit is used for generating the amplitude of the reference radio frequency signal, and the amplitude detection input end is connected with the main amplification module;
the second amplitude detection circuit is used for generating the amplitude of the first radio frequency signal, and the amplitude detection input end is connected with the slave amplification module;
the amplitude control circuit responds to the amplitude of the reference radio frequency signal and generates an amplitude adjusting signal, the first amplitude receiving end is connected with the amplitude detection output end of the first amplitude detection circuit, and the second amplitude receiving end is connected with the amplitude detection output end of the second detection circuit;
the amplitude adjusting circuit responds to the amplitude adjusting signal and adjusts the amplitude of the second radio frequency signal, the amplitude difference receiving end is connected with the amplitude difference output end of the amplitude control circuit, the signal receiving end is connected with the phase tracking module, and the signal output end is connected with the slave amplifying module.
By adopting the technical scheme, the amplitude control circuit is utilized to generate an amplitude adjusting signal according to the amplitude of the reference radio frequency signal generated by the first amplitude detection circuit and the amplitude of the first radio frequency signal generated by the second amplitude detection circuit, and the amplitude adjusting circuit is used for adjusting the amplitude of the second radio frequency signal according to the amplitude adjusting signal so as to obtain the first radio frequency signal with the same amplitude as the reference radio frequency signal.
Optionally, the first amplitude detection circuit and the second amplitude detection circuit each include a transformer T1, a rectifier diode D2, and a variable resistor RH;
the primary side first end of the transformer T1 is connected with the amplitude detection input end, the secondary side first end of the transformer T1 is connected with the anode of the rectifier diode D2, and the primary side second end of the transformer T1 and the secondary side second end of the transformer T2 are grounded;
the cathode of the rectifying diode D2 is connected with one end of the variable resistor RH;
the other end of the variable resistor RH is grounded, and the control end is connected with the amplitude detection output end.
Through adopting above-mentioned technical scheme, utilize transformer T1 to acquire the amplitude of benchmark radiofrequency signal and first radiofrequency signal, through rectifier diode D2 with the amplitude conversion of benchmark radiofrequency signal and first radiofrequency signal into direct current signal, through variable resistor RH partial pressure, calibrate the direct current signal of output to realized the effect that first radiofrequency signal amplitude is unanimous with benchmark radiofrequency signal amplitude.
Optionally, the amplitude adjustment circuit includes a signal attenuator U2.
By adopting the technical scheme, the amplitude of the third radio frequency signal is conveniently adjusted by utilizing the signal attenuator U2, so that the amplitude of the third radio frequency signal is conveniently amplified from the amplifying module to be consistent with the amplitude of the reference radio frequency signal.
In a second aspect, the present application provides a radio frequency power synthesis method, which adopts the following technical scheme:
a radio frequency power synthesis method applied to any one of the above radio frequency power synthesis circuits, the method comprising:
comparing the reference radio frequency signal output by the main amplification module with the first radio frequency signal output by the amplification module to generate an amplitude adjusting signal and a phase adjusting signal;
adjusting the second input signal RF2 input from the amplifying module according to the amplitude adjusting signal and the phase adjusting signal to obtain a third radio frequency signal;
amplifying the third radio frequency signal from the amplifying module and outputting a first radio frequency signal;
and synthesizing the reference radio frequency signal and the first radio frequency signal to obtain a synthesized radio frequency signal OUT.
In a third aspect, the present application provides a radio frequency power synthesis apparatus, which adopts the following technical scheme:
a radio frequency power combining apparatus comprising: comprising a radio frequency power combining circuit as claimed in any one of the preceding claims.
Drawings
Fig. 1 is a block diagram of a radio frequency power combining circuit according to one embodiment of the present application.
Fig. 2 is a block diagram of a radio frequency power combining circuit according to one embodiment of the present application.
Fig. 3 is a circuit connection structure diagram for illustrating phase difference detection according to one embodiment of the present application.
Fig. 4 is a circuit connection structure diagram for showing a phase difference control circuit and phase difference adjustment according to one embodiment of the present application.
Fig. 5 is a circuit connection block diagram showing an amplitude tracking module according to one embodiment of the present application.
Reference numerals illustrate: 1. a main amplifying module; 2. a slave amplification module; 3. a phase tracking module; 31. a phase difference detection circuit; 32. a phase control circuit; 33. a phase adjusting circuit; 4. an amplitude tracking module; 41. a first amplitude detection circuit; 42. a second amplitude detection circuit; 43. an amplitude control circuit; 44. an amplitude adjusting circuit; 5. a power synthesis module; 6. a radio frequency signal source.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to fig. 1 to 5 and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The embodiment of the application discloses a radio frequency power synthesis circuit. Referring to fig. 1, a radio frequency power combining circuit includes:
the main amplifying module 1 is configured to amplify the first input signal RF1 with a first gain to generate a reference radio frequency signal.
Wherein the first gain of the main amplification module 1 may be controlled by a computer program. According to the final required power of the synthesized radio frequency signal OUT, the power of the reference radio frequency signal output by the main amplification module 1 is always maintained to be one half of the required power of the synthesized radio frequency signal OUT by controlling the first gain of the main amplification module 1.
The slave amplification module 2 is configured to amplify the second input signal RF2 or the third radio frequency signal with a second gain to generate a first radio frequency signal.
Wherein, the master amplifying module 1 and the slave amplifying module 2 both adopt radio frequency amplifiers.
Wherein the first gain is smaller than the second gain, and the amplification range of the amplitude of the second input signal RF2 or the third radio frequency signal from the amplification module 2 is increased by setting the first gain smaller than the second gain, so that the first radio frequency signal output from the amplification module 2 is adjusted to be consistent with the reference radio frequency signal.
In addition, the phase delay of the main amplification module 1 is greater than the phase delay of the slave amplification module 2, so that the phase of the first radio frequency signal output from the amplification module 2 has an adjustment range that is advanced or retarded from the main amplification module 1.
It should be noted that the radio frequency signal source 6 is further included, and the first input signal RF1 and the second input signal RF2 are the same radio frequency signal provided by the radio frequency signal source 6.
The phase tracking module 3 is configured to receive the reference RF signal and the first RF signal, and adjust a phase of the second input signal RF2 according to a phase difference between the reference RF signal and the first RF signal, so as to generate a second RF signal.
The amplitude tracking module 4 is configured to receive the reference radio frequency signal and the second radio frequency signal, modulate the amplitude of the second radio frequency signal according to the amplitude difference between the reference radio frequency signal and the second radio frequency signal, generate a third radio frequency signal, and input the third radio frequency signal to the slave amplifying module 2;
and the power synthesis module 5 synthesizes the reference radio frequency signal and the first radio frequency signal to obtain a synthesized radio frequency signal OUT.
The power synthesis module 5 may employ a power synthesizer.
In the above embodiment, according to the amplitude difference and the phase difference of the reference radio frequency signal and the first radio frequency signal, the phase tracking module and the amplitude tracking module are used to adjust the phase and the amplitude of the second input signal RF2 input to the slave amplifying module 2, so as to form closed loop feedback, and the adjusted third radio frequency signal is input to the slave amplifying module as the second input signal RF2, so that the amplitude and the phase of the first radio frequency signal output from the amplifying module are consistent with the amplitude and the phase of the reference radio frequency signal output from the master amplifying module, and the first radio frequency signal and the reference radio frequency signal are synthesized, so that the power loss in the synthesis process is reduced, the failure rate of the master amplifying module 1 and the slave amplifying module 2 is reduced, and the safety of radio frequency signal synthesis is improved. Meanwhile, the accuracy of radio frequency signal synthesis is improved.
It should be noted that, in the related art, if one of the amplifiers is damaged, the power output of the output synthesized video signal cannot meet the requirement, and at this time, the driving is forced to be increased, so that the other amplifier is also damaged. In this embodiment, if the slave amplifying module 2 is damaged, the master amplifying module 1 still outputs the first input signal RF1 according to the first gain, and the output of the slave amplifying module 2 is zero, which only causes insufficient output of the synthesized radio frequency signal OUT and does not cause damage to the master amplifying module 1; if the main amplifying module 1 is damaged, the output of the main amplifying module 1 is zero, and the output of the auxiliary amplifying module 2 is synchronous with the main amplifying module 1, so that the output of the main amplifying module 1 is zero, and the damage of the auxiliary amplifying module 2 is avoided. Thus, the protection of the master amplifying module and the slave amplifying module is realized.
Further, depending on the power level of the synthesized rf signal OUT, it can be determined which of the master amplification module 1 or the slave amplification module 2 is damaged. I.e. when the power of the synthesized radio frequency signal OUT is zero, it indicates that the main amplification module 1 is damaged, and when the power of the synthesized radio frequency signal OUT is equal to the power of the reference radio frequency signal, it indicates that the sub amplification module 2 is damaged.
Referring to fig. 2, as an embodiment of the phase tracking module 3, the phase tracking module 3 includes a phase difference detection circuit 31, a phase control circuit 32, and a phase adjustment circuit 33;
the phase difference detection circuit 31 is configured to generate a phase difference between the reference radio frequency signal and the first radio frequency signal, where the first phase receiving end is connected to the master amplifying module 1, and the second phase receiving end is connected to the slave amplifying module 2;
a phase control circuit 32 which responds to the phase difference and outputs a phase control signal, a phase difference receiving terminal connected to a phase difference output terminal of the phase difference detecting circuit 31, a reference signal receiving terminal for receiving positive polarity voltage +v;
the reference signal receiving terminal is used for receiving the positive voltage +v so that the phase control signal outputted from the phase control circuit 32 is always a positive voltage.
The phase adjusting circuit 33 is responsive to the phase control signal and adjusts the phase of the second input signal RF2, the phase control signal receiving end is connected to the phase control signal output end of the phase control circuit 32, the signal output end is connected to the amplitude tracking module 4, and the signal receiving end is used for accessing the second input signal RF2.
In the above embodiment, the phase difference between the reference radio frequency signal and the first radio frequency signal is acquired by the phase difference detection circuit 31, and the phase difference is converted into the phase control signal by the phase control circuit 32 so that the phase adjustment circuit 33 adjusts the phase of the second input signal RF2 in accordance with the phase control signal.
Referring to fig. 3, as an embodiment of the phase difference detection circuit 31, the phase difference detection circuit 31 employs a half-bridge phase detector; specifically, the half-bridge phase discriminator includes a first rf transformer T2 and a second rf transformer T3, where the first rf transformer T2 is connected to the main amplifying module 1 and is configured to receive a phase of a reference rf signal output by the main amplifying module 1, and the second rf transformer T3 is connected to the slave amplifying module 2 and is configured to receive a phase of a first rf signal output by the slave amplifying module 2, and compare the phase of the reference rf signal with the phase of the first rf signal to output a dc signal for indicating a phase difference.
As another embodiment of the phase difference detection circuit 31, the phase difference detection circuit 31 may be formed using other components capable of outputting a phase difference, such as a phase comparator.
Referring to fig. 4, as an embodiment of the phase control circuit 32, the phase control circuit 32 employs an operational amplifier U1, and the phase difference is conveniently converted into a voltage signal, i.e., a phase control signal, by the operational amplifier U1 so as to adjust the phase of the second input signal RF2. The operational amplifier U1 performs an addition operation, i.e., adds the voltages received at the non-inverting input terminal and the inverting input terminal and outputs the added voltages. More specifically, the operational amplifier U1 has its non-inverting input connected to the positive polarity voltage +v, its inverting input connected to the phase difference receiving terminal, and its output connected to the phase control signal output of the phase control circuit 32; the positive polarity voltage +v and the phase control signal input from the phase difference receiving terminal are added, so that the operational amplifier U1 does not output a negative voltage.
It should be noted that, since the difference range of the phase is defined between-180 ° and 180 °, that is, the voltage range of the signal output from the phase difference output end of the phase difference detection circuit 31 is also within a certain range, a suitable positive polarity voltage +v is set according to the voltage range of the signal output from the phase difference output end of the phase difference detection circuit 31, that is, the absolute value of the positive polarity voltage +v is greater than the absolute value of the signal output from the phase difference output end of the phase difference detection circuit 31, so that the output phase control signal is always a positive polarity voltage.
Referring to fig. 4, as one embodiment of the phase adjustment circuit 33, the phase adjustment circuit 33 includes a first resistor R1 and a varactor diode D1;
a first resistor R1 having one end for accessing the second input signal RF2 and the other end connected to the cathode of the varactor D1, the phase control receiving end of the phase adjustment circuit 33, and the signal output end of the phase adjustment circuit 33;
the anode of the varactor diode D1 is grounded.
Further, the phase adjusting circuit 33 further includes a second resistor R2, a first capacitor C1, and a second capacitor C2, wherein one end of the second capacitor C2 is connected to the phase control receiving end of the phase adjusting circuit 33, and the second resistor R2 is connected in series between the phase control receiving end of the phase adjusting circuit 33 and the cathode of the varactor diode D1; the first capacitor C1 is connected in series between one end of the first resistor R1 and the second input signal RF2, and the second capacitor C2 is connected in series between the other end of the first resistor R1 and the signal output terminal of the phase adjustment circuit 33.
The first capacitor C1 and the second capacitor C2 are coupling capacitors, which are generally used to provide a path for a high-frequency signal, and in this embodiment, the first capacitor C1 and the second capacitor C2 provide a path for the second input signal RF2, so as to facilitate transmission of the second input signal RF2. The second resistor R2 is a load resistor for preventing the second input signal RF2 from being transmitted into the phase difference control circuit.
When the phase control circuit 32 uses the operational amplifier U1, the positive voltage +v is input to the same-direction input of the operational amplifier U1, so that the positive voltage is always output from the output end of the operational amplifier U1, and the varactor diode D1 is always in a state of being biased in the direction, so that the positive voltage output from the output end of the operational amplifier U1 is convenient to adjust the capacitance value of the varactor diode D1.
In the above embodiment, the first resistor R1 and the varactor diode D1 form a phase shifter, so that when the input voltages at the phase control receiving end of the phase adjusting circuit 33 are different, the voltage differences between the cathode and the anode of the varactor diode D1 are different, so that the capacitance values of the varactor diode D1 are different, and further, the phase adjustment of the second input signal RF2 is achieved by adjusting the capacitance values.
Referring to fig. 2, as one embodiment of the amplitude tracking module 4, the amplitude tracking module 4 includes a first amplitude detection circuit 41, a second amplitude detection circuit 42, an amplitude control circuit 43, and an amplitude adjustment circuit 44;
a first amplitude detection circuit 41, configured to generate an amplitude of a reference radio frequency signal, where an amplitude detection input end is connected to the main amplification module 1;
a second amplitude detection circuit 42, configured to generate an amplitude of the first radio frequency signal, where an amplitude detection input terminal is connected to the slave amplification module 2;
an amplitude control circuit 43, which responds to the amplitude of the reference radio frequency signal and generates an amplitude adjustment signal, wherein a first amplitude receiving end is connected with an amplitude detection output end of the first amplitude detection circuit 41, and a second amplitude receiving end is connected with an amplitude detection output end of the second detection circuit;
as one embodiment of the amplitude control circuit 43, the amplitude control circuit 43 includes an error amplifier U3.
The amplitude adjusting circuit 44 is responsive to the amplitude adjusting signal and adjusts the amplitude of the second radio frequency signal, the amplitude difference receiving end is connected to the amplitude difference output end of the amplitude control circuit 43, the signal receiving end is connected to the phase tracking module 3, and the signal output end is connected to the slave amplifying module 2.
Wherein the amplitude adjustment signal is a voltage signal of 0V-1V.
As an embodiment of the amplitude adjustment circuit 44, the amplitude adjustment circuit 44 includes a signal attenuator U2, and as an example, a high-frequency analog multiplier may be used as the signal attenuator U2, where the amplitude control circuit 43 outputs an amplitude adjustment signal of 0-1V direct current and a second radio frequency signal of alternating current are multiplied, that is, attenuation of the second radio frequency signal is achieved, that is, the amplitude of a third radio frequency signal output by the amplitude control circuit 43 after adjusting the second radio frequency signal ranges from 0V to the amplitude of the second radio frequency signal.
In the above embodiment, the amplitude control circuit 43 generates the amplitude adjustment signal based on the amplitude of the reference radio frequency signal generated by the first amplitude detection circuit 41 and the amplitude of the first radio frequency signal generated by the second amplitude detection circuit 42, and the amplitude adjustment circuit 44 adjusts the amplitude of the second radio frequency signal based on the amplitude adjustment signal so as to obtain the first radio frequency signal having the same amplitude as the reference radio frequency signal.
Referring to fig. 5, as an embodiment of the first amplitude detection circuit 41 and the second amplitude detection circuit 42, each of the first amplitude detection circuit 41 and the second amplitude detection circuit 42 includes a transformer T1, a rectifier diode D2, and a variable resistor RH;
the primary side first end of the transformer T1 is connected with the amplitude detection input end, the secondary side first end is connected with the anode of the rectifier diode D2, and the primary side second end and the secondary side second end are grounded;
a rectifying diode D2, wherein the cathode is connected with one end of the variable resistor RH;
the other end of the variable resistor RH is grounded, and the control end is connected with the amplitude detection output end.
By adjusting the resistance value of the variable resistor RH, the voltage division of the variable resistor RH is changed, thereby facilitating the calibration of the amplitude adjustment signal outputted from the amplitude control circuit 43.
Further, the first amplitude detecting circuit 41 and the second amplitude detecting circuit 42 further include a filter capacitor C3, wherein one end of the filter capacitor C3 is connected to the rectifying diode D2, and the other end is grounded.
In the above embodiment, the transformer T1 is used to obtain the amplitudes of the reference radio frequency signal and the first radio frequency signal, the amplitudes of the reference radio frequency signal and the first radio frequency signal are converted into the direct current signal through the rectifier diode D2, and the direct current signal is calibrated through the partial voltage of the variable resistor RH, so that the effect that the amplitude of the first radio frequency signal is consistent with the amplitude of the reference radio frequency signal is achieved.
The embodiment of the application discloses a radio frequency power synthesis method. Referring to fig. 1, a radio frequency power synthesis method includes
A radio frequency power synthesis method applied to any one of the above radio frequency power synthesis circuits, the method comprising:
comparing the reference radio frequency signal output by the main amplification module 1 with the first radio frequency signal output by the amplification module 2 to generate an amplitude adjustment signal and a phase adjustment signal;
adjusting the second input signal RF2 input from the amplifying module 2 according to the amplitude adjusting signal and the phase adjusting signal to obtain a third radio frequency signal;
amplifying the third radio frequency signal from the amplifying module 2 and outputting a first radio frequency signal;
and synthesizing the reference radio frequency signal and the first radio frequency signal to obtain a synthesized radio frequency signal OUT.
The embodiment of the application discloses a radio frequency power synthesis device. A radio frequency power combining device comprising a radio frequency power combining circuit as claimed in any one of the preceding claims.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
The foregoing description of the preferred embodiments of the present application is not intended to limit the scope of the application, in which any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Claims (10)
1. A radio frequency power combining circuit, comprising:
the main amplification module (1) is used for amplifying the first input signal RF1 with a first gain to generate a reference radio frequency signal;
the slave amplification module (2) is used for amplifying the second input signal RF2 or the third radio frequency signal with a second gain to generate a first radio frequency signal;
the phase tracking module (3) is used for receiving the reference radio frequency signal and the first radio frequency signal, and adjusting the phase of the second input signal RF2 according to the phase difference between the reference radio frequency signal and the first radio frequency signal to generate a second radio frequency signal;
the amplitude tracking module (4) is used for receiving the reference radio frequency signal and the second radio frequency signal, modulating the amplitude of the second radio frequency signal according to the amplitude difference between the reference radio frequency signal and the second radio frequency signal, generating a third radio frequency signal, and inputting the third radio frequency signal to the slave amplification module (2);
and the power synthesis module (5) synthesizes the reference radio frequency signal and the first radio frequency signal to obtain a synthesized radio frequency signal OUT.
2. The radio frequency power combining circuit of claim 1, wherein: the first gain is less than the second gain.
3. The radio frequency power combining circuit of claim 1, wherein: the phase tracking module (3) comprises a phase difference detection circuit (31), a phase control circuit (32) and a phase adjustment circuit (33);
the phase difference detection circuit (31) is used for generating a phase difference between a reference radio frequency signal and a first radio frequency signal, the first phase receiving end is connected with the master amplifying module (1), and the second phase receiving end is connected with the slave amplifying module (2);
the phase control circuit (32) responds to the phase difference and outputs a phase control signal, the phase difference receiving end is connected with the phase difference output end of the phase difference detection circuit (31), and the reference signal receiving end is used for receiving positive polarity voltage +V;
the phase adjusting circuit (33) responds to the phase control signal and adjusts the phase of the second input signal RF2, the phase control signal receiving end is connected with the phase control signal output end of the phase control circuit (32), the signal output end is connected with the amplitude tracking module (4), and the signal receiving end is used for accessing the second input signal RF2.
4. A radio frequency power combining circuit as defined in claim 3, wherein: the phase control circuit (32) includes an operational amplifier U1.
5. A radio frequency power combining circuit as defined in claim 3, wherein: the phase adjustment circuit (33) includes a first resistor R1 and a varactor diode D1;
one end of the first resistor R1 is used for being connected with a second input signal RF2, and the other end of the first resistor R1 is connected with the cathode of the varactor diode D1, the phase control receiving end of the phase adjusting circuit (33) and the signal output end of the phase adjusting circuit (33);
the anode of the varactor diode D1 is grounded.
6. The radio frequency power combining circuit of claim 1, wherein: the amplitude tracking module (4) comprises a first amplitude detection circuit (41), a second amplitude detection circuit (42), an amplitude control circuit (43) and an amplitude adjustment circuit (44);
the first amplitude detection circuit (41) is used for generating the amplitude of a reference radio frequency signal, and the amplitude detection input end is connected with the main amplification module (1);
the second amplitude detection circuit (42) is used for generating the amplitude of the first radio frequency signal, and the amplitude detection input end is connected with the slave amplification module (2);
the amplitude control circuit (43) responds to the amplitude of the reference radio frequency signal and generates an amplitude adjustment signal, the first amplitude receiving end is connected with the amplitude detection output end of the first amplitude detection circuit (41), and the second amplitude receiving end is connected with the amplitude detection output end of the second detection circuit;
the amplitude adjusting circuit (44) responds to the amplitude adjusting signal and adjusts the amplitude of the second radio frequency signal, the amplitude difference receiving end is connected with the amplitude difference output end of the amplitude control circuit (43), the signal receiving end is connected with the phase tracking module (3), and the signal output end is connected with the slave amplifying module (2).
7. The radio frequency power combining circuit of claim 6, wherein: the first amplitude detection circuit (41) and the second amplitude detection circuit (42) each include a transformer T1, a rectifier diode D2, and a variable resistor RH;
the primary side first end of the transformer T1 is connected with the amplitude detection input end, the secondary side first end of the transformer T1 is connected with the anode of the rectifier diode D2, and the primary side second end of the transformer T1 and the secondary side second end of the transformer T2 are grounded;
the cathode of the rectifying diode D2 is connected with one end of the variable resistor RH;
the other end of the variable resistor RH is grounded, and the control end is connected with the amplitude detection output end.
8. The radio frequency power combining circuit of claim 6, wherein: the amplitude adjustment circuit (44) comprises a signal attenuator U2.
9. A method of radio frequency power synthesis as claimed in any one of claims 1 to 8, and comprising:
comparing the reference radio frequency signal output by the main amplification module (1) with the first radio frequency signal output by the amplification module (2) to generate an amplitude adjustment signal and a phase adjustment signal;
according to the amplitude adjusting signal and the phase adjusting signal, the second input signal RF2 input from the amplifying module (2) is adjusted to obtain a third radio frequency signal;
amplifying the third radio frequency signal from the amplifying module (2) and outputting a first radio frequency signal;
and synthesizing the reference radio frequency signal and the first radio frequency signal to obtain a synthesized radio frequency signal OUT.
10. A radio frequency power combining apparatus, comprising: a radio frequency power combining circuit comprising any of claims 1 to 8.
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