CN214703953U - Calibration correction device for gain parameters of L-band signal amplification module - Google Patents
Calibration correction device for gain parameters of L-band signal amplification module Download PDFInfo
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- CN214703953U CN214703953U CN202121236571.7U CN202121236571U CN214703953U CN 214703953 U CN214703953 U CN 214703953U CN 202121236571 U CN202121236571 U CN 202121236571U CN 214703953 U CN214703953 U CN 214703953U
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Abstract
The invention provides a calibration and correction device for gain parameters of an L-band signal amplification module, wherein a microwave signal source is connected with a first power sensor through a first directional coupler, the first directional coupler is connected with the L-band signal amplification module through a second directional coupler, the first power sensor monitors the power level of a signal generator which provides an excitation signal for the L-band signal amplification module, the second power sensor monitors an echo signal of the L-band signal amplification module, the first directional coupler couples out the excitation signal of the signal source, and the second directional coupler couples out the echo signal in a channel for testing the L-band signal amplification module and outputs the echo signal to the second power sensor. The invention ensures the level accuracy of the excitation signal of the L-band signal amplification module, controls the matching degree of the test cable connected in the high-low temperature box body, and corrects the output level value of the signal generator by using the measured value, so that the measurement result is more accurate and has better consistency.
Description
Technical Field
The invention relates to the technical field of instrument measurement, in particular to a gain measurement calibration device which can be used for calibrating gain parameters of an excitation module.
Background
The noise parameter and the delay parameter of the L-band signal amplification module are tested at normal temperature and are all completed by a mature and universal method, but like the channel logarithmic amplification characteristic and the channel linear amplification characteristic, the test under the high-temperature and low-temperature environment is needed, and the indexes are very high. And because the test is carried out in the box body, the test cable is easy to bend and deform, so that the magnitude is not uniform during module test, and potential hazards exist in index test data.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a calibration correction device for gain parameters of an L-band signal amplification module, which can improve the measurement accuracy of the gain parameters of the L-band signal amplification module by using a signal monitoring compensation method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a calibration correction device for gain parameters of an L-waveband signal amplification module comprises a first power sensor (1), a second power sensor (2), a first directional coupler (3) and a second directional coupler (4), wherein a microwave signal source is connected with the first power sensor (1) through the first directional coupler (3), the first directional coupler (3) is connected with an L-waveband signal amplification module through the second directional coupler (4), the L-waveband signal amplification module is connected with a spectrum analyzer through a cable, the first power sensor (1) monitors the power level of a signal generator which provides an excitation signal for the L-waveband signal amplification module, the second power sensor (2) monitors an echo signal of the L-waveband signal amplification module, the first directional coupler (3) couples out the excitation signal of the signal source, the second directional coupler (4) couples out the echo signal in a channel for testing the L-waveband signal amplification module, and outputs to the second power sensor (2).
The first power sensor (1) monitors the power level of a signal generator which provides an excitation signal for the L-waveband signal amplification module, the excitation input port of the L-waveband signal amplification module needs to accurately input a level signal, the accuracy of the level of an output signal of the signal generator is +/-1 dB, the measurement accuracy of the power sensor in the L-waveband range reaches within 0.2dB, and when the difference between the signal level of the excitation input port of the L-waveband signal amplification module and a nominal ideal value is more than 0.2dB, the level output of the signal generator is adjusted; level output monitoring of the signal generator is performed using a first power sensor (1) to provide an accurate input level for the L-band signal amplification module.
The second power sensor (2) monitors echo signals of the L-band signal amplification module, an excitation input port of the L-band signal amplification module needs to accurately input level signals, when the connection standing wave of each port is in an ideal state during the initial connection, after the L-band signal amplification module is placed in the high-low temperature box, because the cable connecting port of the high-low temperature box is not positioned at the excitation input port of the L-waveband signal amplification module, the connecting cable can be bent and deformed to cause mismatching of the cable and increase of echo, the echo signal of the L-waveband signal amplification module is monitored by using the second power sensor (2), and whether mismatching occurs or not is found when high-low temperature tests are carried out, when mismatching is found, readjusting the cable position and compensating the input signal power of the L-band signal amplification module by using the echo signal power monitored by the second power sensor (2); since the power of the echo signal is much less than that of the excitation signal, a power sensor with a large dynamic range is selected to measure a signal level of-60 dBm.
The first directional coupler (3) couples out the excitation signal of the signal source, because the power sensor has high measurement accuracy when measuring a high-level signal, and the level of the excitation signal required by the module to be measured is small, the through path is output to the first power sensor (1), the coupling path is output to the L-band signal amplification module, the insertion loss of the through path and the coupling path of the directional coupler needs to be measured before the test, and the measurement result is corrected by using the insertion loss value.
And the second directional coupler (4) couples the echo signal in the channel of the test L-band signal amplification module out and outputs the echo signal to the second power sensor (2). Because the power of the echo signal is small, the coupling degree of the second directional coupler (4) needs to be reduced as much as possible, and the directional coupler with the coupling degree of-10 dB is selected. Before testing, the insertion loss of the through path and the coupling path of the directional coupler needs to be measured, and the insertion loss value is used for correcting the power measurement result of the echo signal.
The invention has the beneficial effects that:
1. the invention adopts the directional coupler to couple the through path, the power sensor to monitor and the path insertion loss correction method to control the output power of the signal generator and ensure the level accuracy of the excitation signal of the L-waveband signal amplification module.
2. The invention adopts the method of coupling the directional coupler with the echo path and monitoring the power sensor to control the matching degree of the test cable connected in the high-low temperature box body and utilizes the measured value to correct the output level value of the signal generator, so that the measurement result is more accurate and has better consistency.
Drawings
FIG. 1 is a system test connection diagram of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The invention provides a calibration correction device for gain parameters of an L-band signal amplification module.
A calibration correction device for gain parameters of an L-band signal amplification module comprises a system consisting of a first power sensor (1), a second power sensor (2), a first directional coupler (3) and a second directional coupler (4).
The first power sensor (1) is responsible for monitoring the power level of a signal generator which provides an excitation signal for the L-waveband signal amplification module, the excitation input port of the L-waveband signal amplification module needs to accurately input a level signal, the accuracy of the level of an output signal of the signal generator is generally +/-1 dB, the measurement accuracy of the power sensor in the L-waveband range can reach within 0.2dB, and when the difference between the signal level of the excitation input port of the L-waveband signal amplification module and a nominal ideal value is larger than 0.2dB, the level output of the signal generator is adjusted. The level output monitoring of the signal generator by using the first power sensor (1) can provide accurate input level for the L-band signal amplification module.
The second power sensor (2) is responsible for monitoring the size of an echo signal of the L-band signal amplification module, an excitation input port of the L-band signal amplification module needs to accurately input a level signal, when the connection is initially connected, the connection standing wave of each port is generally in an ideal state, and after the L-band signal amplification module is placed in the high-low temperature box, because the cable connecting port of the high-low temperature box is not positioned at the excitation input port of the L-waveband signal amplification module, the connecting cable can be bent and deformed, the cable can be mismatched, the echo is increased, the echo signal of the L-waveband signal amplification module is monitored by using the second power sensor (2), when the mismatching is found, the cable position should be readjusted and the power of the echo signal monitored by the second power sensor (2) is used for compensating the input signal power of the L-band signal amplification module. Since the power of the echo signal is much less than that of the excitation signal, a power sensor with a large dynamic range is selected to measure a signal level of-60 dBm.
The third directional coupler (3) is responsible for coupling out the excitation signal of the signal source, and because the power sensor has high measurement accuracy when measuring a high-level signal, and the level of the excitation signal required by the module to be measured is small, the through path is output to the first power sensor (1), and the coupling path is output to the L-band signal amplification module. Before testing, the insertion loss of the through path and the coupling path of the directional coupler needs to be measured, and the measurement result is corrected by using the insertion loss value.
And the fourth directional coupler (4) is responsible for coupling the echo signal in the channel of the test L-band signal amplification module and outputting the coupled echo signal to the second power sensor (2). Because the power of the echo signal is small, the coupling degree of the fourth directional coupler (4) needs to be reduced as much as possible, and the directional coupler with the coupling degree of-10 dB is selected. Before testing, the insertion loss of the through path and the coupling path of the directional coupler needs to be measured, and the insertion loss value is used for correcting the power measurement result of the echo signal.
Fig. 1 is a system test connection diagram of the present invention, a radio frequency excitation input port of a tested L-band signal amplification module is connected to a through output port of a second directional coupler (4), a coupling port of the second directional coupler (4) is connected to a second power sensor (2), an input port of the second directional coupler (4) is connected to a coupling port of a first directional coupler (3), an input port of the first directional coupler (3) is connected to a microwave signal source, and a through output port of the first directional coupler (3) is connected to the second directional coupler (4).
The above description is only one specific example of the present invention, and it is obvious to those skilled in the art that various modifications and changes in form and detail can be made without departing from the principles of the present invention, but these modifications and changes based on the idea of the present invention are still within the protection scope of the claims of the present invention.
Claims (5)
1. A calibration correction device for gain parameters of an L-band signal amplification module comprises a first power sensor (1), a second power sensor (2), a first directional coupler (3) and a second directional coupler (4), and is characterized in that:
a microwave signal source is connected with a first power sensor (1) through a first directional coupler (3), the first directional coupler (3) is connected with an L-waveband signal amplification module through a second directional coupler (4), the L-waveband signal amplification module is connected with a spectrum analyzer through a cable, the first power sensor (1) monitors the power level of a signal generator which provides an excitation signal for the L-waveband signal amplification module, a second power sensor (2) monitors an echo signal of the L-waveband signal amplification module, the first directional coupler (3) couples out the excitation signal of the signal source, and the second directional coupler (4) couples out the echo signal in a channel for testing the L-waveband signal amplification module and outputs the echo signal to the second power sensor (2).
2. The apparatus of claim 1, wherein the apparatus for calibrating and correcting the gain parameter of the L-band signal amplification module comprises:
the first power sensor (1) monitors the power level of a signal generator which provides an excitation signal for the L-waveband signal amplification module, the excitation input port of the L-waveband signal amplification module needs to accurately input a level signal, the accuracy of the level of an output signal of the signal generator is +/-1 dB, the measurement accuracy of the power sensor in the L-waveband range reaches within 0.2dB, and when the difference between the signal level of the excitation input port of the L-waveband signal amplification module and a nominal ideal value is more than 0.2dB, the level output of the signal generator is adjusted; level output monitoring of the signal generator is performed using a first power sensor (1) to provide an accurate input level for the L-band signal amplification module.
3. The apparatus of claim 1, wherein the apparatus for calibrating and correcting the gain parameter of the L-band signal amplification module comprises:
the second power sensor (2) monitors echo signals of the L-band signal amplification module, an excitation input port of the L-band signal amplification module needs to accurately input level signals, a connection standing wave of each port is in an ideal state during initial connection, when the L-band signal amplification module is placed in a high-low temperature box, echoes are increased, the echo signals of the L-band signal amplification module are monitored by the second power sensor (2), whether mismatching occurs during high-low temperature tests is found, and when mismatching is found, the cable position is readjusted, and the power of the echo signals obtained by monitoring by the second power sensor (2) is used for compensating the input signal power of the L-band signal amplification module; a power sensor with a large dynamic range was selected to measure a signal level magnitude of-60 dBm.
4. The apparatus of claim 1, wherein the apparatus for calibrating and correcting the gain parameter of the L-band signal amplification module comprises:
the first directional coupler (3) couples out an excitation signal of a signal source, a through path is output to the first power sensor (1), a coupling path is output to the L-waveband signal amplification module, the insertion loss of the through path and the coupling path of the directional coupler needs to be measured before testing, and the measurement result is corrected by using an insertion loss value.
5. The apparatus of claim 1, wherein the apparatus for calibrating and correcting the gain parameter of the L-band signal amplification module comprises:
the second directional coupler (4) couples the echo signal in the path of the test L-band signal amplification module, outputs the echo signal to the second power sensor (2), selects a directional coupler with-10 dB coupling degree, measures the insertion loss of a direct path and a coupling path of the directional coupler, and corrects the echo signal power measurement result by using the insertion loss value.
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| CN202121236571.7U CN214703953U (en) | 2021-06-03 | 2021-06-03 | Calibration correction device for gain parameters of L-band signal amplification module |
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| CN202121236571.7U CN214703953U (en) | 2021-06-03 | 2021-06-03 | Calibration correction device for gain parameters of L-band signal amplification module |
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| CN202121236571.7U Expired - Fee Related CN214703953U (en) | 2021-06-03 | 2021-06-03 | Calibration correction device for gain parameters of L-band signal amplification module |
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