CN113922790B - Group delay tuning-based power synthesis circuit and signal transmission system - Google Patents
Group delay tuning-based power synthesis circuit and signal transmission system Download PDFInfo
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Abstract
The invention provides a power synthesis circuit and a signal transmission system based on group delay tuning, comprising: a low noise amplifier for preventing electromagnetic signals from being large; the group delay tuning module adjusts the group delay characteristic of the device in an external voltage tuning mode, so that the power synthesis effect of the power amplifying circuit is changed; peak detection is connected to the output end for detecting the maximum power of signal output, and the peak detection is matched with the operational amplifier circuit and the threshold voltage control circuit to realize tuning control of the group delay tuning module, so that a complete feedback loop is formed. The invention can effectively improve the synthesis effect of the power synthesis circuit, improve the amplification efficiency of the power amplification circuit and reduce the power consumption, can realize the gain control and compensation functions in a small range to a certain extent in a reverse tuning mode, and can be applied to flat group delay circuits and circuits with high power synthesis efficiency.
Description
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to a power synthesis circuit and a signal transmission system based on group delay tuning.
Background
The power amplifying circuit is used for amplifying electromagnetic signals and widely applied to various circuits and systems, in the process of actually designing the amplifying circuit, in order to obtain higher circuit gain, a common, simple and stable means is to use multistage amplification to perform power synthesis, but is limited by inter-stage matching, the problems of poor amplitude-frequency phase characteristics, internal thermal noise and the like caused by the difference between actual chip individuals are often solved, the multistage power synthesis circuit cannot achieve the effect of high-efficiency synthesis in the design, and the difficulty of power synthesis is further improved along with the improvement of an application frequency band, the synthesis efficiency is further reduced, for example, when the frequency band is increased to an E band, the actual synthesis gain of the two-stage 10dB power synthesis circuit is only about 4.5dB, and the main reason is that the difference of phase spectrums between two paths of signals is difficult to achieve accurate and consistent signal alignment during superposition, the frequency is further improved along with the increase and the bandwidth increase, the power enhancement of the amplifying circuit of a high band is greatly limited, and the power consumption is also increased on the condition of the same power requirement. Therefore, a more suitable power synthesis method is needed to improve the synthesis efficiency, so as to meet the power amplification requirements of the continuously developed rf microwave circuit and the continuously improved application frequency band.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a power combining circuit and a signal transmission system based on group delay tuning, which are used for further improving the combining efficiency of the power combining circuit, and meanwhile, the amplifying circuit has a flat group delay characteristic.
To achieve the above and other related objects, the present invention provides a group delay tuning-based power combining circuit, which at least includes:
The system comprises a low noise amplifier, a splitter, a tuning voltage control module, a group delay tuning module and a power synthesizer;
the low noise amplifier receives an input signal and amplifies the input signal;
The splitter is connected to the output end of the low noise amplifier and divides the output signal of the low noise amplifier into at least two paths of outputs;
the tuning voltage control module obtains the maximum output efficiency of the power synthesis circuit based on group delay tuning, and generates corresponding tuning control voltage based on the maximum output efficiency;
The group delay tuning module is connected to the output ends of the splitter and the tuning voltage control module, and respectively tunes the group delay characteristics of each path of signals output by the splitter based on the tuning control voltage so as to change the power of the output signals of the power synthesis circuit based on the group delay tuning;
The power synthesizer is connected to the output end of the group delay tuning module and performs power synthesis on each tuned signal.
Optionally, the power synthesis circuit based on group delay tuning further comprises a coupler, wherein the coupler is connected to the output end of the power synthesizer, couples the main path signal output by the power synthesizer to the tuning voltage control module as an input standard for power discrimination, and outputs the main path signal output by the power synthesizer.
Optionally, the tuning voltage control module comprises a peak detector, a threshold voltage controller and an operational amplifier;
The peak detector obtains the maximum output efficiency of the power synthesis circuit based on group delay tuning in a peak detection mode;
The threshold voltage controller provides a preset tuning threshold;
The operational amplifier is connected to the peak detector and the output end of the threshold voltage controller, and obtains a corresponding tuning control voltage based on the difference value between the maximum output efficiency and the tuning threshold.
More optionally, the threshold voltage controller is a single chip microcomputer or a programmable gate array, and the curve of the tuning control voltage is secondarily changed and defined in a program compiling manner.
More optionally, the tuning voltage control module further includes a mute filter, where the mute filter is connected to an output end of the operational amplifier, and is configured to filter crosstalk signals on a control line.
Optionally, the input or output of the group delay tuning module further comprises a low pass filter.
Optionally, the power synthesis circuit based on group delay tuning further includes an amplifying module, where the amplifying module is disposed between the splitter and the group delay tuning module, and is configured to amplify each output of the splitter respectively.
In order to achieve the above and other related objects, the present invention further provides a signal transmission system, where the signal transmission system at least includes the above power synthesis circuit based on group delay tuning, and the power synthesis circuit based on group delay tuning is used to improve group delay characteristics of the signal transmission system and improve phase linearity.
As described above, the group delay tuning-based power synthesis circuit and signal transmission system of the present invention have the following beneficial effects:
1. The group delay tuning-based power synthesis circuit and the signal transmission system introduce the group delay tuning module to adjust the phase frequency characteristic of the circuit, thereby changing the power synthesis effect of the circuit and improving the synthesis efficiency.
2. The power synthesis circuit and the signal transmission system based on group delay tuning enable the power synthesis circuit to have a self-defined adjustment function through the configuration of the tuning voltage control module; the power of the output signal may be reduced by a reverse adjustment and increased by a forward adjustment.
3. The power synthesis circuit and the signal transmission system based on the group delay tuning automatically control the group delay tuning module according to the feedback result of the peak detector and in combination with the preset threshold voltage, thereby achieving the aim of automatically searching the preset peak value within the adjustment allowable range and avoiding the problem of debugging the complex redundant circuit group delay characteristics.
4. The power synthesis circuit based on group delay tuning can be used as an independent circuit transmission response characteristic control component to be applied to various systems, and is used for improving the group delay characteristic of the system and improving the phase linearity of the system.
Drawings
Fig. 1 is a schematic diagram of a power combining circuit based on group delay tuning according to the present invention.
Description of element reference numerals
1. Power synthesis circuit based on group delay tuning
11. Low noise amplifier
12. Branching unit
13A, 13b first and second amplifiers
14. Tuning voltage control module
141. Peak detector
142. Threshold voltage controller
143. Operational amplifier
144. Noise filter
15A, 15b first and second group delay tuners
16. Combiner device
17. Directional coupler
18. Matching loads
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Please refer to fig. 1. It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
Example 1
As shown in fig. 1, the present embodiment provides a power combining circuit 1 based on group delay tuning, the power combining circuit 1 based on group delay tuning includes:
A low noise amplifier 11, a splitter 12, a tuning voltage control module 14, a group delay tuning module, and a power combiner 16.
As shown IN fig. 1, the low noise amplifier 11 receives an input signal IN and amplifies the input signal IN.
Specifically, IN this embodiment, the input signal IN is a radio frequency signal. The structure of the low noise amplifier 11 is not limited, and any circuit structure capable of reducing the noise of the amplifier itself and improving the signal-to-noise ratio is suitable, and will not be described in detail herein.
As shown in fig. 1, the splitter 12 is connected to the output end of the low noise amplifier 11, and splits the output signal of the low noise amplifier 11 into at least two paths.
Specifically, the splitter 12 splits an input signal into a plurality of signals to be output to different communication lines. In this embodiment, the splitter 12 outputs two paths of signals, and in actual use, the number of output signals of the splitter may be set according to needs, which is not limited to this embodiment.
As shown in fig. 1, as another implementation manner of the present invention, the two signals output by the splitter 12 are further amplified by an amplifier. Specifically, the power synthesis circuit 1 based on group delay tuning further includes a first amplifier 13a and a second amplifier 13b, where the first amplifier 13a is connected to one output signal of the splitter 12, and amplifies the one output signal; the second amplifier 13b is connected to the other output signal of the splitter 12, and amplifies the other output signal.
As shown in fig. 1, the tuning voltage control module 14 obtains the maximum output efficiency of the group delay tuning-based power combining circuit 1, and generates a corresponding tuning control voltage based on the maximum output efficiency.
Specifically, the tuning voltage control module 14 automatically controls the group delay tuning module according to the maximum output efficiency in combination with a preset threshold voltage, so as to achieve the purpose of automatic searching of a preset peak value within the adjustment allowable range, and avoid the problem of debugging the complex redundant circuit group delay characteristic. In this embodiment, the tuning voltage control module 14 includes a peak detector 141, a threshold voltage controller 142, and an operational amplifier 143.
More specifically, the peak detector 141 obtains the maximum output efficiency of the group delay-tuned power combining circuit 1 by peak detection. The peak detector 141 performs envelope detection on the output signal of the power synthesis circuit 1 tuned by the base Yu Qunshi, and obtains the maximum output power through an envelope; any circuit structure capable of realizing peak detection is suitable for the present invention, and is not described in detail herein.
More specifically, the threshold voltage controller 142 provides a preset tuning threshold. As an example, the threshold voltage controller 142 is a single chip microcomputer or a programmable gate array, and performs secondary modification and definition on the curve of the tuning control voltage outputted by the tuning voltage control module 14 in a program compiling manner to meet different requirements.
More specifically, the operational amplifier 143 is connected to the peak detector 141 and the output terminal of the threshold voltage controller 142, and obtains a corresponding tuning control voltage based on the difference between the maximum output efficiency and the tuning threshold.
More specifically, as another implementation manner of the present invention, the tuning voltage control module 14 further includes a mute filter 144, where the mute filter 144 is connected to the output end of the operational amplifier 143, and is used for filtering the crosstalk signal on the control line, so as to improve the stability and reliability of the group delay tuning.
As shown in fig. 1, the group delay tuning module is connected to the output ends of the splitter 12 and the tuning voltage control module 14, and is configured to tune the group delay characteristics of each signal output by the splitter 12 based on the tuning control voltage so as to change the power of the signal output by the power combining circuit 1 based on the group delay tuning.
Specifically, in this embodiment, the group delay tuning module includes a first group delay tuner 15a and a second group delay tuner 15b; the first group delay tuner 15a is connected to the output end of the first amplifier 13a, and performs phase adjustment on the output signal of the first amplifier 13 a; the second group delay tuner 15b is connected to the output end of the second amplifier 13b, and performs phase adjustment on the output signal of the second amplifier 13 b; the tuning control voltage includes two groups of signals, and controls the first group delay tuner 15a and the second group delay tuner 15b to perform phase adjustment respectively, so as to realize tuning of group delay characteristics. As an example, the group delay characteristics are adjusted in the forward direction, and the first group delay tuner 15a and the second group delay tuner 15b respectively adjust phases of the two signals so that the two signals completely overlap (phase is consistent), and at this time, the synthesized signal power is the largest. As another example, the group delay characteristics are reversely adjusted, and the first group delay tuner 15a and the second group delay tuner 15b respectively adjust phases of two signals so that phases of the two signals are opposite (phase difference pi), and at this time, the synthesized signal power is the smallest (for gain control and attenuation control with a small range). In practical use, the group delay characteristic can be adjusted according to the requirement, which is not limited to the present embodiment.
It should be noted that, in this embodiment, the group delay tuning module is a voltage-controlled group delay tuning module, and in actual use, any circuit structure capable of implementing group delay tuning may be selected, which is not described herein in detail. The number of group delay tuners in the group delay tuning module may be set according to needs, which is not limited to the embodiment, and as an example, two paths of signals may be provided with one group delay tuner, and only the phase of one path of signal is adjusted to realize tuning of group delay.
As shown in fig. 1, the power combiner 16 is connected to the output of the group delay tuning module, and performs power combining on the tuned signals.
Specifically, the power combiner 16 adds the signals output by the first group delay tuner 15a and the second group delay tuner 15b to obtain a power-combined signal.
As shown in fig. 1, as another implementation of the present invention, the power combining circuit 1 based on group delay tuning further includes a coupler 17. The coupler 17 is connected to the output end of the power combiner 16, couples the main signal output by the power combiner 16 to the tuning voltage control module 14 for power detection, and outputs the main signal output by the power combiner 16.
Specifically, the coupler 17 includes an input end, a coupling end, a load end, and an output end; the input end of the coupler 17 is connected with the output end of the power synthesizer 16; the coupling end of the coupler 17 is connected with the peak detector 141, and a part of the main signal is coupled to the peak detector 141 for peak detection; the load end of the coupler 17 is connected with a matching load 18; the output of the coupler 17 outputs a main signal OUT. The coupler 17 may be configured as a coupler of different coupling degrees and may be connected to different loads according to different impedance requirements.
As another implementation manner of the present invention, the input end or the output end of the group delay tuning module further includes a low-pass filter (not shown in the figure) for filtering noise on the signal transmission path.
The power synthesis circuit based on group delay tuning prevents electromagnetic signals greatly through the low-noise amplifier; the group delay characteristic of the device is adjusted by adopting an external voltage tuning mode through a group delay tuning module, so that the power synthesis effect of the power amplifying circuit is changed; the peak detector is also used for detecting the maximum power of the output signal, and the operational amplifier and the threshold voltage controller are matched to realize the tuning control of the group delay tuning component, so that a complete feedback loop is formed. The power synthesis circuit can effectively improve the synthesis effect of the power synthesis circuit, improve the amplification efficiency of the power amplification circuit, reduce the power consumption, realize the gain control and compensation functions in a small range to a certain extent in a reverse tuning mode, and be applied to flat group delay circuits and circuits with high power synthesis efficiency.
Example two
The present embodiment provides a signal transmission system including the group delay tuning-based power combining circuit of the first embodiment.
The power synthesis circuit based on group delay tuning is used for improving the group delay characteristic of the signal transmission system, improving the phase linearity, and any signal transmission system needing to improve the group delay characteristic is suitable for the invention, including but not limited to a radio frequency signal receiving and transmitting system, a flat group delay system and a system with high power synthesis efficiency.
In summary, the present invention provides a power combining circuit and a signal transmission system based on group delay tuning, including: the system comprises a low noise amplifier, a splitter, a tuning voltage control module, a group delay tuning module and a power synthesizer; the low noise amplifier receives an input signal and amplifies the input signal; the splitter is connected to the output end of the low noise amplifier and divides the output signal of the low noise amplifier into at least two paths of outputs; the tuning voltage control module obtains the maximum output efficiency of the power synthesis circuit based on group delay tuning, and generates corresponding tuning control voltage based on the maximum output efficiency; the group delay tuning module is connected to the output ends of the splitter and the tuning voltage control module, and respectively tunes the group delay characteristics of each path of signals output by the splitter based on the tuning control voltage so as to change the power of the output signals of the power synthesis circuit based on the group delay tuning; the power synthesizer is connected to the output end of the group delay tuning module and performs power synthesis on each tuned signal. The group delay tuning-based power synthesis circuit and the signal transmission system of the invention introduce the group delay tuning module to adjust the phase frequency characteristic of the circuit on the basis of the conventional power synthesis topological structure, thereby changing the power synthesis effect of the circuit and improving the synthesis efficiency; meanwhile, the configuration of the tuning voltage control module enables the self-defined adjustment function of the power synthesis circuit to be realized, the power of the output signal can be reduced through reverse adjustment, the gain control function is realized, and the power of the output signal can be increased through forward adjustment; in addition, the group delay tuning module is automatically controlled according to the feedback result of the peak detector and in combination with a preset threshold voltage, so that the aim of automatic searching of a preset peak value is fulfilled within an adjustment allowable range, and the problem of debugging of complex redundant circuit group delay characteristics is avoided; furthermore, the invention can be used as an independent circuit transmission response characteristic control component applied to a system circuit for improving the group delay characteristic of the circuit and improving the phase linearity of the circuit. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (8)
1. A group delay tuning based power combining circuit, the group delay tuning based power combining circuit comprising at least:
The system comprises a low noise amplifier, a splitter, a tuning voltage control module, a group delay tuning module and a power synthesizer;
the low noise amplifier receives an input signal and amplifies the input signal;
The splitter is connected to the output end of the low noise amplifier and divides the output signal of the low noise amplifier into at least two paths of outputs;
The tuning voltage control module obtains the maximum output efficiency of the power synthesis circuit based on group delay tuning, and generates a corresponding tuning control signal based on the maximum output efficiency;
The group delay tuning module is connected to the output ends of the splitter and the tuning voltage control module, and respectively tunes the group delay characteristics of each path of signals output by the splitter based on the tuning control signals so as to change the power of the output signals of the power synthesis circuit based on the group delay tuning;
The power synthesizer is connected to the output end of the group delay tuning module and performs power synthesis on each tuned signal.
2. The group delay tuning based power combining circuit of claim 1, wherein: the power synthesis circuit based on group delay tuning further comprises a coupler, wherein the coupler is connected to the output end of the power synthesizer, couples a main signal output by the power synthesizer to the tuning voltage control module as an input standard for power discrimination, and outputs the main signal output by the power synthesizer.
3. The group delay tuning based power combining circuit of claim 1, wherein: the tuning voltage control module comprises a peak detector, a threshold voltage controller and an operational amplifier;
The peak detector obtains the maximum output efficiency of the power synthesis circuit based on group delay tuning in a peak detection mode;
The threshold voltage controller provides a preset tuning threshold;
The operational amplifier is connected to the peak detector and the output end of the threshold voltage controller, and obtains a corresponding tuning control voltage based on the difference value between the maximum output efficiency and the tuning threshold.
4. The group delay tuning based power combining circuit of claim 3, wherein: the threshold voltage controller is a singlechip or a programmable gate array, and the curve of the tuning control voltage is secondarily changed and defined in a program compiling mode.
5. The group delay tuning based power combining circuit of claim 3 or 4, wherein: the tuning voltage control module further comprises a mute filter, wherein the mute filter is connected to the output end of the operational amplifier and is used for filtering crosstalk signals on a control line.
6. The group delay tuning based power combining circuit of claim 1, wherein: the input end or the output end of the group delay tuning module also comprises a low-pass filter.
7. The group delay tuning based power combining circuit of claim 1, wherein: the power synthesis circuit based on the group delay tuning further comprises an amplifying module, wherein the amplifying module is arranged between the branching unit and the group delay tuning module and is used for amplifying each path of output of the branching unit respectively.
8. A signal transmission system, wherein the signal transmission system at least comprises a group delay tuning-based power synthesis circuit according to any one of claims 1 to 7, and the group delay tuning-based power synthesis circuit is configured to improve group delay characteristics of the signal transmission system and improve phase linearity.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107171644A (en) * | 2016-03-08 | 2017-09-15 | 南方科技大学 | Modulation signal generating circuit based on phase adjuster |
| CN111669148A (en) * | 2020-06-19 | 2020-09-15 | 中国电子科技集团公司第二十六研究所 | Tunable bandpass filter, apparatus and method |
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| KR20150011605A (en) * | 2013-07-23 | 2015-02-02 | 삼성전기주식회사 | Filter tuning circuit, multi-stage filter tuning circuit and method for tuning filter |
| CN107592085B (en) * | 2017-09-18 | 2018-09-07 | 深圳锐越微技术有限公司 | Power amplifier and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107171644A (en) * | 2016-03-08 | 2017-09-15 | 南方科技大学 | Modulation signal generating circuit based on phase adjuster |
| CN111669148A (en) * | 2020-06-19 | 2020-09-15 | 中国电子科技集团公司第二十六研究所 | Tunable bandpass filter, apparatus and method |
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