CN213846649U - Low-stray low-phase-noise power signal source - Google Patents
Low-stray low-phase-noise power signal source Download PDFInfo
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Abstract
The utility model discloses a low stray, low phase noise power signal source, the utility model discloses a radio frequency signal source comprises a reference source circuit, a phase-locked loop circuit, a filter circuit and a gain control circuit; the reference source circuit is used for providing a reference signal for the phase-locked loop circuit; the phase-locked loop circuit adopts a broadband frequency synthesizer integrated with a VCO to form a closed loop circuit and generate a frequency signal; the filter circuit realizes the segmented filtering of the frequency signal through shunting and outputs 20M-6G signals; and the gain control circuit performs gain control on the 20M-6G signals output by the filter circuit to obtain the required signal power and outputs the signal power. The utility model discloses a signal source adopts integrated VCO's broadband frequency synthesizer to replace traditional VCO, and reduce cost optimizes simultaneously and is stray.
Description
Technical Field
The utility model belongs to the technical field of the radio frequency signal source, concretely relates to low stray, low phase noise power signal source.
Background
Due to the gradual development of the technical level of the communication industry in recent years, people have gradually entered the era of the communication industry, and the radio frequency information technology gradually covers more and more fields. The communication technology makes important contributions to national defense industry construction, aerospace industry development and communication development of other civil enterprises. Under this condition, the development of radio frequency signal sources for communication technology is an indispensable instrument. The demand of the radio frequency signal source is gradually increased, and the quality requirement of the radio frequency signal source is also improved. There is a need for efficient, convenient, and practical instruments. Most of the existing radio frequency signal sources are too large in size and heavy in mass, so that the radio frequency signal sources are not flexible and convenient enough in the using process, large in occupied space and inconvenient to move and carry, the using efficiency of the radio frequency signal sources is low, and the functions of instruments cannot be fully played. At present, most radio frequency signal sources have large power consumption, and the service life of the radio frequency signal sources is generally long, so that the power consumption of enterprises is caused. And the price of the instrument is high, so that the production cost of an enterprise is increased. Some radio frequency signal sources have small use frequency range (only 3G) and cannot meet the production use.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that the current radio frequency signal source is bulky, the consumption is big or the use frequency range is little, the utility model provides a low stray, low phase noise power signal source. The frequency range of the signal source in this embodiment is 20M-6000M, and the power range is-100 dBm-15 dBm.
The utility model discloses a following technical scheme realizes:
a low stray, low phase noise power signal source, the utility model discloses a radio frequency signal source includes reference source circuit, phase-locked loop circuit, filter circuit and gain control circuit;
the reference source circuit is used for providing a reference signal for the phase-locked loop circuit;
the phase-locked loop circuit adopts a broadband frequency synthesizer integrated with a VCO to form a closed loop circuit and generate a frequency signal;
the filter circuit realizes the segmented filtering of the frequency signal through shunting and outputs 20M-6G signals;
and the gain control circuit performs gain control on the 20M-6G signals output by the filter circuit to obtain the required signal power and outputs the signal power.
Preferably, the reference source circuit of the present invention comprises a crystal oscillator for generating a reference signal, wherein a signal generated by the crystal oscillator is amplified by a first amplifier and then sent to a first radio frequency switch through a first resistance attenuator;
an external reference signal passes through a second resistance attenuator and then is sent to a second amplifier through a first-stage filter to be amplified and then is input to a first power divider, one path of output signal of the first power divider is sent to the first radio-frequency switch through a second-stage filter, the other path of output signal of the first power divider is input to the detection circuit, and the detection circuit output signal controls the first radio-frequency switch to select a signal output by the first attenuator or a signal output by the second-stage filter;
a signal passing through the first radio frequency switch passes through a third resistance attenuator and then is input into a third amplifier for amplification and then is input into a second power divider, and one path of output signal of the second power divider is output to the outside through a fourth-stage filter and used as reference output; and the other path of output signal of the second power divider passes through a third-stage filter and then is supplied to the phase-locked loop as a reference signal.
Preferably, the phase-locked loop circuit of the present invention comprises a phase discriminator, a loop filter, a wideband frequency synthesizer integrated with the VCO, a fourth resistive attenuator, and a fourth amplifier;
the phase detector receives the reference signal output by the reference source circuit, the output voltage controls the VCO part of the wideband frequency synthesizer of the integrated VCO after passing through the loop filter, the output of the wideband frequency synthesizer of the integrated VCO sequentially passes through the fourth resistance attenuator and the fourth amplifier and then is input to the feedback end of the phase detector, so that a closed loop is formed, and the output of the wideband frequency synthesizer of the integrated VCO is simultaneously sent to the filter circuit.
Preferably, the filter circuit of the present invention comprises a fifth amplifier, a shunt filter unit, a fifth resistance attenuator and a sixth amplifier;
and the fifth amplifier amplifies the output signal of the wideband frequency synthesizer of the integrated VCO, then sends the amplified output signal to the shunt filter unit for shunt filtering, and then sequentially processes the amplified output signal through the fifth resistance attenuator and the sixth amplifier and outputs the amplified output signal to the control circuit.
Preferably, the shunt filter unit of the present invention includes a single-pole multi-throw switch a, a single-pole multi-throw switch B, a single-pole multi-throw switch C, and a single-pole multi-throw switch D;
a plurality of filters are arranged in parallel between the single-pole multi-throw switch A and the single-pole multi-throw switch C; a plurality of filters are arranged in parallel between the single-pole multi-throw switch B and the single-pole multi-throw switch D; the single-pole multi-throw switch A and the single-pole multi-throw switch B are connected in parallel, and the single-pole multi-throw switch C and the single-pole multi-throw switch D are connected in parallel;
and the signals amplified by the fifth amplifier are switched and selected by the single-pole multi-throw switch A, the single-pole multi-throw switch B, the single-pole multi-throw switch C and the single-pole multi-throw switch D to enter a filter for filtering.
Preferably, the 7 LFCN filters are arranged in parallel between the single-pole multi-throw switch a and the single-pole multi-throw switch C; 7 LC low-pass filters and 1 LFCN filter are arranged in parallel between the single-pole multi-throw switch B and the single-pole multi-throw switch D.
Preferably, the gain control circuit of the present invention comprises a first attenuator, a second rf switch, a seventh amplifier, an eighth amplifier, and a third rf switch;
the seventh amplifier and the eighth amplifier are arranged between the second radio frequency switch and the fourth radio frequency switch in parallel;
the signals output by the filter circuit are processed by the first attenuator and the second attenuator in sequence, and then 20M-3G signals and 3G-6G signals are respectively controlled by the seventh amplifier and the eighth amplifier through the second radio frequency switch branch circuit, so that the required signal power is obtained and is output through the third radio frequency switch.
Preferably, the eighth amplifier and the ninth amplifier of the present invention both employ a controllable gain amplifier.
Preferably, the signal source of the present invention further comprises a calibration circuit, wherein the calibration circuit employs a logarithmic detector to detect the signal power outputted by the gain control module in real time and sends the signal power to the AD converter;
the AD converter processes the received signal power to obtain an AD code value, and the AD code value is used for controlling the parameters of the gain control module and realizing the real-time calibration of the output signal power.
The utility model discloses have following advantage and beneficial effect:
1. compare the device that uses in traditional radio frequency signal source with high costs, the VCO (voltage controlled oscillator) of broadband scope is with high costs, the utility model discloses a signal source adopts the broadband frequency synthesizer of integrated VCO to replace traditional VCO, and reduce cost optimizes simultaneously and is stray.
2. The utility model discloses a real-time calibration can be realized to the signal source, the reliability of signal source can be improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic block diagram of a frequency synthesizer according to the present invention.
Fig. 2 is a schematic block diagram of the gain control circuit and the calibration circuit of the present invention.
Fig. 3 is a front view of the signal source device of the present invention.
Fig. 4 is a top view of the signal source device of the present invention.
Fig. 5 is a rear view of the signal source device of the present invention.
Reference numbers and corresponding part names in the drawings:
x1-radio frequency output interface, X2-power switch, X3-power socket, X4-network interface, X5-USB interface, X6-reference input interface and X7-reference output interface.
Detailed Description
Hereinafter, the terms "include" or "may include" used in various embodiments of the present invention indicate the existence of the functions, operations or elements of the present invention, and do not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to refer only to the particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combination of the foregoing.
In various embodiments of the present invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Examples
Compared with the existing signal source, the signal source has the problems of large volume, poor signal quality, high cost and the like, and the embodiment provides the signal source with low stray and low phase noise power. In this embodiment, a wideband frequency synthesizer integrated with a VCO (voltage-controlled oscillator) is used to replace a conventional VCO to implement a radio frequency signal source, so that the cost can be reduced, spurious signals can be optimized, and the quality of the signal source can be improved.
The radio frequency signal source of the embodiment mainly comprises a low-spurious, low-phase noise frequency synthesizer and a gain control circuit.
Specifically, as shown in fig. 1, the frequency synthesizer of the present embodiment includes a reference source circuit, a phase-locked loop circuit, and a filter circuit.
In this embodiment, the reference source circuit is configured to provide a reference signal for the phase-locked loop circuit; the phase-locked loop circuit adopts a broadband frequency synthesizer integrated with a VCO to form a closed loop circuit and generate a frequency signal; the filter circuit realizes the segmented filtering of the frequency signal through shunting and outputs 20M-6G signals; the control circuit performs gain control and real-time calibration on the 20M-6G signals output by the filter circuit and outputs a required radio frequency signal source.
Specifically, as shown in fig. 1, the reference source circuit of this embodiment includes a crystal oscillator VCXO for generating a reference signal, a first amplifier, a first resistive attenuator ATT1, a first rf switch SPDT1, a second stage filter, a detector circuit, a first power divider, a second amplifier, a first stage filter, a second resistive attenuator ATT2, a third resistive attenuator ATT3, a third amplifier, a fourth stage filter, a second power divider, and a third stage filter.
A signal generated by the crystal oscillator is amplified by the first amplifier, passes through the first resistance attenuator and is sent to the first radio frequency switch; an external reference signal is transmitted to a second amplifier through a first-stage filter after passing through a second resistance attenuator and then is amplified and then is input to a first power divider, one path of output signal of the first power divider is transmitted to a first radio frequency switch through a second-stage filter, the other path of output signal of the first power divider is input to a detection circuit, and the detection circuit outputs a signal to control the first radio frequency switch to select a signal output by the first attenuator or a signal output by the second-stage filter; a signal passing through the first radio frequency switch passes through a third resistance attenuator and then is input into a third amplifier for amplification and then is input into a second power divider, and one path of output signal of the second power divider is output to the outside through a fourth-stage filter and used as reference output; and the other output signal of the second power divider is supplied to a phase-locked loop as a reference signal after passing through a third-stage filter.
The phase-locked loop circuit of this embodiment includes a phase detector, a loop filter, a wideband frequency synthesizer of the integrated VCO, a fourth resistive attenuator ATT4, and a fourth amplifier.
The phase detector receives a reference signal output by the reference source circuit, the output voltage controls a VCO part of the wideband frequency synthesizer of the integrated VCO after passing through the loop filter, the output of the wideband frequency synthesizer of the integrated VCO sequentially passes through the fourth resistance attenuator and the fourth amplifier and then is input to a feedback end of the phase detector, so that a closed loop is formed, and the output of the wideband frequency synthesizer of the integrated VCO is simultaneously sent to the filter circuit.
The filter circuit of the present embodiment includes a fifth amplifier, a shunt filter unit, a fifth resistive attenuator ATT5, and a sixth amplifier.
The fifth amplifier amplifies the output signal of the wideband frequency synthesizer integrated with the VCO, then the amplified output signal is sent to the shunt filtering unit for shunt filtering, and then the amplified output signal is processed by the fifth resistance attenuator and the sixth amplifier in sequence and output to the control circuit.
In this embodiment, more path selection is realized by connecting single-pole multi-throw switches in parallel, the branching filtering unit of this embodiment adopts a radio frequency switch to realize multi-path filter segmented filtering, and specifically, the branching filtering unit of this embodiment includes a single-pole multi-throw switch a, a single-pole multi-throw switch B, a single-pole multi-throw switch C, and a single-pole multi-throw switch D. In this embodiment, the signal amplified by the fifth amplifier is selectively switched by the single-pole multi-throw switch a, the single-pole multi-throw switch B, the single-pole multi-throw switch C, and the single-pole multi-throw switch D into a filter for filtering.
7 LFCN filters are arranged in parallel between the single-pole multi-throw switch A and the single-pole multi-throw switch C; 7 LC low-pass filters (LPF) and 1 LFCN filter are arranged in parallel between the single-pole multi-throw switch B and the single-pole multi-throw switch D; and the single-pole multi-throw switch A and the single-pole multi-throw switch B are connected in parallel, and the single-pole multi-throw switch C and the single-pole multi-throw switch D are connected in parallel. That is, in this embodiment, 8 LFCN low-pass filters are commonly used, wherein 7 of the LFCN low-pass filters are switched by the single-pole multi-throw switch a and enter the LFCN low-pass filter, and then are sent to the single-pole multi-throw switch C, the 8 th LFCN filter and the 7 th low-pass filter are switched and controlled by the single-pole multi-throw switch B to realize segmented filtering, and then are combined by the single-pole multi-throw switch D, and then fed into the single-pole multi-throw switch C, and output to the fifth resistance attenuator and the sixth amplifier for processing, and finally, output signals (20M to 6G) to the control module.
The gain control circuit of this embodiment adopts attenuator and controllable gain amplifier to realize the gain control of output signal in order to obtain required signal power, and the control circuit of this embodiment adopts the logarithmic detector real-time detection output signal power to carry out real-time calibration, thereby obtain more accurate signal power.
Specifically, as shown in fig. 2, the gain control circuit of the present embodiment includes a first attenuator, a second rf switch SPDT2, a seventh amplifier, an eighth amplifier, and a third rf switch SPDT 3.
The seventh amplifier and the eighth amplifier are arranged between the second radio frequency switch and the fourth radio frequency switch in parallel;
signals (20M-6G) output by the filter circuit are processed by the first attenuator and the second attenuator in sequence, then divided into 20M-3G signals (low frequency) and 3G-6G signals (high frequency) by the second radio frequency switch, and respectively controlled by the seventh amplifier and the eighth amplifier to obtain required signal power which is output by the third radio frequency switch.
The eighth amplifier and the ninth amplifier of the present embodiment both employ controllable gain amplifiers.
The signal source of this embodiment still includes calibration circuit, and the calibration circuit of this embodiment adopts logarithm detector and AD conversion device to realize real-time calibration power, and the logarithm detector has the excellent logarithm intercept, through feeding back the radio frequency signal of test to the logarithm detector, the logarithm detector is through connecting the AD converter, and the real-time calibration power is realized to AD sign indicating number value by AD converter output at last, improves the quality of signal source.
Specifically, as shown in fig. 2, the calibration circuit of the present embodiment includes a sixth resistive attenuator ATT6, a fourth radio frequency switch SPTD4, a ninth amplifier, a seventh resistive attenuator ATT7, a fifth radio frequency switch SPDT5, and a logarithmic detector.
In this embodiment, after the signal power output by the gain control circuit is fed back to the sixth resistive attenuator for processing, the signal power is switched by the fourth rf switch and enters the ninth amplifier and the seventh resistive attenuator for processing, and then the signal power is output to the logarithmic detector by the fifth rf switch.
The logarithmic detector sends the detected signal to the AD converter, the AD converter converts the received signal into an AD code value and sends the AD code value to the controller (the controller can adopt but is not limited to an FPGA), and the controller controls parameters in the gain control module in real time according to the change of the AD code value, so that the power of the signal finally output by the gain control module can reach the theoretically required power to the maximum extent. The power range can reach-130 dBm to 15 dBm.
The principle of obtaining the AD code value in this embodiment is as follows: the measured rf signal is applied to a logarithmic detector. The device is configured in a so-called "measurement mode". In this mode, the output voltage is in a linear dB relationship with the input signal level (nominally-24 mV/dB), with a typical output voltage range of 0.5V to 2.1V. The AD converter can be configured into a single-channel or double-channel working mode through the controller control register; the output of the logarithmic detector is directly connected to the AD converter; the ADC uses an internal reference voltage source of the ADC, and the input range of the ADC is 0V-2.5V; when the logarithmic detector provides a slope of nominal-24 mV/dB, the digital resolution is 39.3 LSB/dB; with such a high resolution, the 0.5V to 2.1V signal from the logarithmic detector is adjusted.
In another preferred embodiment, the controller is provided with a temperature monitor, and the power output of the control signal can be suitable for the change of the ambient temperature at any time according to the external temperature change, so that the power error is reduced.
As shown in fig. 3 to 5, in the radio frequency signal source device obtained in this embodiment, circuit modules of a radio frequency signal source are all integrated in a box, and a radio frequency output interface X1, a power switch X2, a power socket X3, a network port X4, a USB interface X5, a reference input interface X6, and a reference output interface X7 are arranged on a wall of the box.
The radio frequency output interface X1 and the power switch X2 are arranged on the same surface of the box body, the power socket X3, the network port X4, the USB interface X5, the reference input interface X6 and the reference output interface X7 are arranged on the other surface of the box body, and the two surfaces are opposite.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A low-stray low-phase noise power signal source is characterized in that the power signal source comprises a reference source circuit, a phase-locked loop circuit, a filter circuit and a gain control circuit;
the reference source circuit is used for providing a reference signal for the phase-locked loop circuit;
the phase-locked loop circuit adopts a broadband frequency synthesizer integrated with a VCO to form a closed loop circuit and generate a frequency signal;
the filter circuit realizes segmented filtering of the frequency signal through shunting and outputs 20M-6G signals;
and the gain control circuit performs gain control on the 20M-6G signal output by the filter circuit to obtain the required signal power and outputs the signal power.
2. The low spurious, low phase noise power signal source of claim 1, wherein the reference source circuit comprises a crystal oscillator, a first amplifier, a first resistive attenuator, a first rf switch, a second stage filter, a detector circuit, a first power divider, a second amplifier, a first stage filter, a second resistive attenuator, a third amplifier, a fourth stage filter, a second power divider, and a third stage filter for generating a reference signal;
the signal generated by the crystal oscillator is amplified by the first amplifier, passes through the first resistance attenuator and is sent to the first radio frequency switch;
an external reference signal passes through a second resistance attenuator and then is sent to a second amplifier through a first-stage filter to be amplified and then is input to a first power divider, one path of output signal of the first power divider is sent to the first radio-frequency switch through a second-stage filter, the other path of output signal of the first power divider is input to the detection circuit, and the detection circuit output signal controls the first radio-frequency switch to select a signal output by the first attenuator or a signal output by the second-stage filter;
a signal passing through the first radio frequency switch passes through a third resistance attenuator and then is input into a third amplifier for amplification and then is input into a second power divider, and one path of output signal of the second power divider is output to the outside through a fourth-stage filter and used as reference output; and the other path of output signal of the second power divider passes through a third-stage filter and then is supplied to the phase-locked loop as a reference signal.
3. A low spurious, low phase noise power signal source as defined in claim 1, wherein said phase locked loop circuit includes a phase detector, a loop filter, a wideband frequency synthesizer of an integrated VCO, a fourth resistive attenuator, and a fourth amplifier;
the phase detector receives the reference signal output by the reference source circuit, the output voltage controls the VCO part of the wideband frequency synthesizer of the integrated VCO after passing through the loop filter, the output of the wideband frequency synthesizer of the integrated VCO sequentially passes through the fourth resistance attenuator and the fourth amplifier and then is input to the feedback end of the phase detector, so that a closed loop is formed, and the output of the wideband frequency synthesizer of the integrated VCO is simultaneously sent to the filter circuit.
4. A low spurious, low phase noise power signal source as claimed in claim 1, wherein said filter circuit includes a fifth amplifier, a shunt filter unit, a fifth resistive attenuator, and a sixth amplifier;
and the fifth amplifier amplifies the output signal of the wideband frequency synthesizer of the integrated VCO, then sends the amplified output signal to the shunt filter unit for shunt filtering, and then sequentially processes the amplified output signal through the fifth resistance attenuator and the sixth amplifier and outputs the amplified output signal to the control circuit.
5. The low spurious, low phase noise power signal source of claim 4, wherein said shunt filtering unit comprises a single-pole multi-throw switch A, a single-pole multi-throw switch B, a single-pole multi-throw switch C, and a single-pole multi-throw switch D;
a plurality of filters are arranged in parallel between the single-pole multi-throw switch A and the single-pole multi-throw switch C; a plurality of filters are arranged in parallel between the single-pole multi-throw switch B and the single-pole multi-throw switch D; the single-pole multi-throw switch A and the single-pole multi-throw switch B are connected in parallel, and the single-pole multi-throw switch C and the single-pole multi-throw switch D are connected in parallel;
and the signals amplified by the fifth amplifier are switched and selected by the single-pole multi-throw switch A, the single-pole multi-throw switch B, the single-pole multi-throw switch C and the single-pole multi-throw switch D to enter a filter for filtering.
6. The low spur, low phase noise power signal source of claim 5, wherein 7 LFCN filters are connected in parallel between said single-pole multi-throw switch a and said single-pole multi-throw switch C; 7 LC low-pass filters and 1 LFCN filter are arranged in parallel between the single-pole multi-throw switch B and the single-pole multi-throw switch D.
7. The low spur, low phase noise power signal source of claim 1, wherein the gain control circuit comprises a first attenuator, a second rf switch, a seventh amplifier, an eighth amplifier, and a third rf switch;
the seventh amplifier and the eighth amplifier are arranged between the second radio frequency switch and the fourth radio frequency switch in parallel;
and the signals output by the filter circuit are processed by the first attenuator and the second attenuator in sequence, and then are subjected to control by the second radio frequency switch branch circuit to obtain the required signal power through the seventh amplifier and the eighth amplifier respectively, and then the required signal power is output through the third radio frequency switch.
8. The low spurious, low phase noise power signal source of claim 7, in which said eighth amplifier and said ninth amplifier each employ a controllable gain amplifier.
9. The signal source of claim 1, further comprising a calibration circuit, wherein the calibration circuit uses a logarithmic detector to detect the signal power outputted from the gain control circuit in real time and send it to an AD converter;
the AD converter processes the received signal power to obtain an AD code value, and the AD code value is used for controlling parameters of the gain control circuit and realizing real-time calibration of the output signal power.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116519626A (en) * | 2023-06-25 | 2023-08-01 | 中国工程物理研究院流体物理研究所 | Signal detection circuit and system for terahertz spectrum and imaging measurement system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116519626A (en) * | 2023-06-25 | 2023-08-01 | 中国工程物理研究院流体物理研究所 | Signal detection circuit and system for terahertz spectrum and imaging measurement system |
| CN116519626B (en) * | 2023-06-25 | 2023-09-19 | 中国工程物理研究院流体物理研究所 | Signal detection circuit and system for terahertz spectrum and imaging measurement system |
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