CN112147404A - Self-adaptive zero-point-stabilizing video detection circuit and working method thereof - Google Patents
Self-adaptive zero-point-stabilizing video detection circuit and working method thereof Download PDFInfo
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Abstract
The invention discloses a self-adaptive zero-point-stabilizing video detection circuit and a working method thereof. The circuit comprises a broadband single-pole single-throw switch, a broadband power divider, a detector group, a summing operational amplifier unit and a direct current branching unit which are sequentially connected, wherein the direct current branching unit comprises Va1 and Va2 signal output ends, Va1 is connected to the same-direction input end of a high-speed subtraction unit, Va2 is connected to a first input end of a control processing unit, a temperature sensor and a zero control enable EN are respectively connected to a second input end and an enable end of the control processing unit, a Va3 signal output end of the control processing unit is connected to the reverse input end of the high-speed subtraction unit, the output end of the high-speed subtraction unit outputs two paths of Vb signals 1, Vb 67vb 63 and 2 through the direct current branching unit, and Vb1 outputs video detection signals. The invention has the advantages of high zero amplitude consistency, good amplitude phase detection consistency, automatic calibration and correction of output zero point and the like.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a self-adaptive zero-point-stabilizing video detection circuit and a working method thereof.
Background
The self-adaptive stable zero point video detection circuit is an electronic component mainly used in electronic system equipment of digital microwave communication, mobile communication, radar, electronic countermeasure and guidance instrument, etc. In the receiver circuit of the sub-ratio, as a multichannel video detection circuit, the main technical indicators for describing the performance of the product are as follows: 1) an operating frequency bandwidth; 2) detecting a dynamic range; 3) direct current zero drift; 4) a pulse rising and falling edge; 5) linearity; 6) video output errors; 7) the voltage standing wave ratio of the input end; 8) and (4) amplitude consistency.
In the similar video detection device products, due to the defects of circuit topology and process implementation approaches adopted by design, under the temperature change, the zero point of an output video is large in fluctuation, and the electrical performance indexes are poor. The main disadvantages are: 1) fluctuation difference of zero point under temperature change; 2) the amplitude consistency is poor; 3) the process processing difficulty is high; 4) the debugging is complex; 5) low dynamic range of detection power, etc.
Disclosure of Invention
The invention aims to provide a self-adaptive zero-stabilizing video detection circuit with simple process, stability, reliability and low cost and a working method thereof.
The technical solution for realizing the purpose of the invention is as follows: a self-adaptive zero-point-stabilizing video detection circuit comprises a broadband single-pole single-throw switch, a broadband power divider, a detector group, a summing operational amplifier unit and a direct-current shunt unit which are connected in sequence, the direct current shunt unit comprises a Va1 signal output end and a Va2 signal output end, the Va1 signal output end is connected with the homodromous input end of the high-speed subtraction unit, the Va2 signal output end is connected with the first input port of the control processing unit, the temperature sensor is connected with the second input port of the control processing unit, the zero point control enable EN is connected with the enable end of the control processing unit, the Va3 signal output end of the control processing unit is connected with the reverse input end of the high-speed subtraction unit, the Vb signal output end of the high-speed subtraction unit is connected with the direct current shunt unit, the Vb2 signal output end of the direct current shunt unit is connected to the third input port of the control processing unit, and the Vb 1.
Furthermore, the output ports of the broadband power divider are respectively connected with the detector group, and the detector group outputs a plurality of signals which are commonly connected to the homodromous port of the summing operational amplifier circuit; the reverse ports of the summing operational amplifier circuit are respectively connected with one ends of a first resistor R1 and a second resistor R2, the other end of the first resistor R1 is grounded, and the other end of the second resistor R2 is connected with the output port of the summing operational amplifier circuit.
Further, the broadband power divider adopts a broadband design of 50 ohm matching.
Further, the detector set is integrated on an MMIC chip of GaAs technology.
Further, the control processing unit adopts an ATMEGA2560-16AU chip.
An operating method of a video detection circuit with adaptive stable zero point comprises an adaptive zero point calibration mode and an operating mode, wherein:
adaptive zero calibration mode: enabling an EN signal to be effective in zero control, isolating an externally input broadband radio-frequency signal through a broadband single-pole single-throw switch, dividing an internal noise signal into n paths of radio-frequency signals after passing through a broadband power divider, and converting each path of corresponding radio-frequency signal into direct-current signals V1-Vn through a detector group for output;
since V1-Vn will change at different temperatures, the dc amplified signal Va output by the summing op-amp circuit will also change, one port of the first resistor R1 is connected to the inverting input port of the summing op-amp circuit, the other port of the first resistor R1 is connected to ground, one port of the second resistor R2 is connected to the inverting input port of the summing op-amp circuit, the other port of the second resistor R2 is connected to the output port of the summing op-amp circuit, the first resistor R1 and the second resistor R2 are combined to be the amplification factor of the summing op-amp circuit, the amplification factor is 1+ (R2/R1):
Va＝[1+(R2/R1)]×∑(V1、V2...Vn)
after passing through the direct-current shunt unit, the direct-current amplified signal Va output by the summing operational amplifier circuit is shunted into a Va1 signal and a Va2 signal, wherein a Va1 signal is input to the homodromous input end of the high-speed subtraction unit, a Va2 signal is input to a first input port of the control processing unit, the other AD input 2 port of the control processing unit is connected to an output port of the temperature sensor, and the temperature sensor is connected to a second input port of the control processing unit;
the Va3 signal output end of the control processing unit is connected with the reverse input end of the high-speed subtraction unit, and the Vb signal output end of the high-speed subtraction unit is connected with the direct current shunt unit; the direct current shunt unit shunts two groups of signals, namely Vb1 and Vb2, a Vb1 signal output end is used for outputting a video detection signal, a Vb2 signal output end is connected to a third input port of the control processing unit, the control processing unit carries out self-adaptive judgment on the collected Vb2 signal, and the voltage of the Va3 signal is adjusted until the voltage of the Vb2 signal approaches to zero voltage;
when the circuit is under different temperature changes, due to the corresponding change of the noise integral power of the internal devices, the Va1 signal input to the equidirectional input port of the high-speed subtraction circuit also changes along with the change, and the control processing unit controls and outputs the Va3 signal to finish the self-adaptive stable zero calibration under the temperature change;
under the working mode, because the zero control enable EN signal is invalid, for the externally input broadband radio frequency signal, the external signal is directly transmitted to the broadband power divider through the broadband single-pole single-throw switch, the signal respectively enters the detector group after being expanded by the broadband power divider in a dynamic range, the obtained direct current amplification signal Va enters the high-speed subtraction unit through the direct current shunt unit under the summation of the summation operational amplifier circuit, the direct current amplification signal Va is subtracted from the Va3 signal of the control processing unit to output a Vb signal voltage, and the Vb signal voltage outputs a dynamically changed video detection output Vb1 signal through the direct current shunt unit.
Further, the processing unit is controlled to perform self-adaptive judgment on the collected Vb2 signal, and the voltage of the Va3 signal is adjusted until the voltage of the Vb2 signal approaches to the zero voltage, and the judgment basis is as follows: when the collected Vb2 signal voltage is a positive value and exceeds the maximum reference voltage required by system indexes, the Va3 signal voltage output by control is increased; when the acquired Vb2 signal voltage is a negative value and exceeds the maximum reference voltage required by system indexes, the output Va3 signal voltage is reduced through control, and the adjustment of the Va3 signal voltage is stopped until the Vb2 signal voltage approaches to the zero voltage.
Further, the calibration of the adaptive stable zero point under the temperature change is specifically as follows:
when the temperature rises, the temperature rise information is collected through the temperature sensor, the voltage collected by the Va2 signal is reduced, the voltage of the Vb2 signal is increased towards a negative value, and the output Va3 signal is controlled to be reduced through the control processing unit until the voltage of the Vb2 signal approaches to zero voltage; when the temperature is reduced, the temperature reduction information is collected through the temperature sensor, the voltage of the Va2 signal is increased, the voltage of the Vb2 signal is increased towards positive voltage, the output Va3 signal is controlled to be increased through the control processing unit until the voltage of the Vb2 signal approaches zero voltage, and self-adaptive stable zero point calibration under temperature change is completed.
Compared with the prior art, the invention has the following remarkable advantages: (1) the method can be adaptive to working environments with different temperatures, and the zero point output after the radio frequency signal is subjected to logarithmic detection is stable; (2) the video zero signal amplitude consistency among a plurality of similar modules is good; (3) the stability from radio frequency to video signals is good under the temperature change, and the batch consistency of the electrical property among circuits is good; (4) the zero point of the video can be adjusted by self-adaptive software at high and low temperatures, and the debugging workload is small; (5) the radio frequency detection has large dynamic range and low cost.
Drawings
FIG. 1 is a block diagram of the adaptive zero-stabilized video detection circuit of the present invention.
Fig. 2 is a flow chart of the method of operation of the adaptive zero-stabilized video detection circuit of the present invention.
Detailed Description
The invention relates to a self-adaptive zero point stabilizing video detection circuit. The circuit comprises a broadband single-pole single-throw switch, a zero control enable, a broadband power divider, a broadband amplifier, a detector group, a summing operational amplifier unit, a direct-current shunt unit, a temperature sensor, a control processing unit, a high-speed subtraction unit and the like. The circuit sets a zero point self-adaptive calibration mode and working mode switching through a zero point control enabling control bit, under the self-adaptive zero point calibration mode, a broadband radio frequency noise signal passes through a broadband power divider to output a plurality of paths of radio frequency signals, a first path of radio frequency small signal passes through a broadband amplifier and then passes through a first path of logarithmic detectors to output a direct current voltage V1, a second path of radio frequency large signal of the broadband power divider is connected with a second path of logarithmic detectors to output a direct current voltage V2, a nth path of radio frequency large signal of the broadband power divider is connected with an nth path logarithmic detectors to output direct current voltages Vn, V1-Vn pass through a summation and operational amplifier circuit unit to obtain a Va signal, Va is divided into direct current voltages Va1 and Va2 through a direct current path dividing unit, the first direct current voltage Va1 directly enters a positive phase input port of a rear high-speed subtraction unit, and the second direct current voltage Va2 enters an acquisition input port of a, the second input port of the control processing unit is connected with the temperature sensor unit, a variable reference voltage Va3 which is self-adaptively output in the control processing unit is connected with the inverted port of the high-speed comparator unit, and a stable zero voltage Vb is output after the comparison of the high-speed comparator unit; the Vb voltage is respectively output by the direct current shunt unit as final self-adaptive stable zero output by a Vb1, and the Vb2 is fed back to the control processing unit to detect and output related voltage signals to realize full self-adaptive control.
With reference to fig. 1, the adaptive zero point stabilizing video detector circuit of the present invention includes a wideband single-pole single-throw switch 1, a wideband power divider 3, a detector group 4, a summing and operational amplifier unit 5, and a dc shunt unit 6, which are connected in sequence, where the dc shunt unit 6 includes a Va1 signal output terminal and a Va2 signal output terminal, the Va1 signal output terminal is connected to the homodromous input terminal of a high-speed subtraction unit 9, the Va2 signal output terminal is connected to a first input port of a control processing unit 8, a temperature sensor 7 is connected to a second input port of the control processing unit 8, a zero point control enable EN2 is connected to an enable terminal of the control processing unit 8, the Va3 signal output terminal of the control processing unit 8 is connected to an inverted input terminal of the high-speed subtraction unit 9, the Vb signal output terminal of the high-speed subtraction unit 9 is connected to the dc shunt unit 10, and the Vb2 signal output terminal, the Vb1 signal output terminal of dc splitting unit 10 is used to output a video detection signal.
Further, the output ports of the broadband power divider 3 are respectively connected with the detector group 4, and the detector group 4 outputs a plurality of signals which are commonly connected to the homodromous port of the summing operational amplifier circuit 5; the reverse ports of the summing operational amplifier circuit 5 are respectively connected with one ends of a first resistor R1 and a second resistor R2, the other end of the first resistor R1 is grounded, and the other end of the second resistor R2 is connected with the output port of the summing operational amplifier circuit 5.
Further, the broadband power divider 2 adopts a broadband design of 50 ohm matching.
Further, the detector set 4 is integrated on an MMIC chip of GaAs technology.
Further, the control processing unit 8 adopts an ATMEGA2560-16AU chip.
Referring to fig. 2, the working method of the self-adaptive zero-stabilizing video detection circuit of the present invention includes a self-adaptive zero calibration mode and a working mode, wherein:
adaptive zero calibration mode: the signal of the zero control enable EN2 is effective, the broadband radio frequency signal input from the outside is isolated by the broadband single-pole single-throw switch 1, the internal noise signal is divided into n paths of radio frequency signals after passing through the broadband power divider 3, and each path of corresponding radio frequency signal is converted into a direct current signal V1-Vn to be output through the detector group 4;
since V1-Vn will change at different temperatures, the dc amplified signal Va output by the summing op-amp circuit 5 will also change, one port of the first resistor R1 is connected to the inverting input port of the summing op-amp circuit 5, the other port of the first resistor R1 is connected to ground, one port of the second resistor R2 is connected to the inverting input port of the summing op-amp circuit 5, the other port of the second resistor R2 is connected to the output port of the summing op-amp circuit 5, the first resistor R1 and the second resistor R2 are combined to be the amplification factor of the summing op-amp circuit, the amplification factor is 1+ (R2/R1):
Va＝[1+(R2/R1)]×∑(V1、V2...Vn)
after passing through the direct current shunt unit 6, the direct current amplified signal Va output by the summing operational amplifier circuit 5 is shunted into a Va1 signal and a Va2 signal, wherein the Va1 signal is input to the homodromous input end of the high-speed subtraction unit 9, the Va2 signal is input to a first input port of the control processing unit 8, the other AD input 2 port of the control processing unit 8 is connected to an output port of the temperature sensor 7, and the temperature sensor 7 is connected to a second input port of the control processing unit 8;
a Va3 signal output end of the control processing unit 8 is connected to an inverted input end of the high-speed subtraction unit 9, and a Vb signal output end of the high-speed subtraction unit 9 is connected to the direct current shunt unit 10; the direct current shunt unit 10 shunts two groups of signals, namely Vb1 and Vb2, a Vb1 signal output end is used for outputting a video detection signal, a Vb2 signal output end is connected to a third input port of the control processing unit 8, the control processing unit 8 carries out self-adaptive judgment on the collected Vb2 signal, and the voltage of the Va3 signal is adjusted until the voltage of the Vb2 signal approaches to zero voltage;
when the circuit is under different temperature changes, due to the corresponding change of the noise integral power of the internal devices, the Va1 signal input to the equidirectional input port of the high-speed subtraction circuit 9 is changed, and the control processing unit 8 controls and outputs the Va3 signal, so that the self-adaptive stable zero calibration under the temperature changes is completed;
under the working mode, because the zero control enable EN2 signal is invalid, for the broadband radio frequency signal input from the outside, the external signal is directly transmitted to the broadband power divider 3 through the broadband single-pole single-throw switch 1, the signal respectively enters the detector group 4 after the dynamic range of the signal is expanded by the broadband power divider 3, the obtained direct current amplified signal Va enters the high-speed subtraction unit 9 through the direct current shunt unit 6 under the summation of the summation operational amplifier circuit 5, the direct current amplified signal Va is subtracted from the Va3 signal of the control processing unit 8 to output a Vb signal voltage, and the Vb signal voltage outputs a dynamically-changed video detection output Vb1 signal after passing through the direct current shunt unit 10.
Further, the control processing unit 8 performs adaptive judgment on the collected Vb2 signal, adjusts the voltage of the Va3 signal until the voltage of the Vb2 signal approaches to the zero voltage, and the judgment basis is as follows: when the collected Vb2 signal voltage is a positive value and exceeds the maximum reference voltage required by system indexes, the Va3 signal voltage output by control is increased; when the acquired Vb2 signal voltage is a negative value and exceeds the maximum reference voltage required by system indexes, the output Va3 signal voltage is reduced through control, and the adjustment of the Va3 signal voltage is stopped until the Vb2 signal voltage approaches to the zero voltage.
Further, the calibration of the adaptive stable zero point under the temperature change is specifically as follows:
when the temperature rises, the temperature rise information is collected through the temperature sensor 7, the voltage collected by the Va2 signal is reduced, the voltage of the Vb2 signal is increased towards a negative value, and the output Va3 signal is controlled to be reduced through the control processing unit 8 until the voltage of the Vb2 signal tends to zero voltage; when the temperature is reduced, the temperature reduction information is collected through the temperature sensor 7, the voltage of the Va2 signal is increased, the voltage of the Vb2 signal is increased towards positive voltage, the output Va3 signal is controlled to be increased through the control processing unit 8 until the voltage of the Vb2 signal approaches zero voltage, and self-adaptive stable zero point calibration under temperature change is completed.
The invention has the advantages of high zero amplitude consistency in a wider working temperature range, good amplitude phase detection consistency, capability of automatically calibrating and correcting output zero through software, wide application prospect and the like.
The invention is described in further detail below with reference to the figures and specific embodiments.
Examples
With reference to fig. 1 and fig. 2, the adaptive zero-point stabilization video detection circuit of the present invention is composed of a wideband single-pole single-throw switch 1, a zero-point control enable EN2, a wideband power divider 3, a detector group 4, a summing and operational amplifier unit 5, a dc shunt unit 6, a temperature sensor unit 7, a control processing unit 8, a high-speed subtraction unit 9, and a dc shunt unit 10.
The circuit is divided into two states of an adaptive zero calibration mode and an operating mode.
In the adaptive zero calibration mode: after the zero control enable EN2 signal is effective, for the broadband radio frequency signal input from the outside, the external signal is isolated by the broadband single-pole single-throw switch 1, and the internal noise signal passes through the broadband power divider 3 and then enters the port after passing through the detector group 4; the detector group 4 converts the corresponding radio frequency signals into direct current signals V1-Vn and outputs the direct current signals.
The dynamic range of the input signal can be increased by multiple times by the V1, V2 through Vn summing circuits. Since V1, V2 to Vn vary at different temperatures, the dc amplified signal Va output by the summing op-amp circuit 5 also varies. One port of the resistor R1 is connected to the inverting input port of the summing operational amplifier circuit 5, the other port is connected to the ground, the other port of the resistor R2 is connected to the inverting input port of the summing operational amplifier circuit 5 and one port of the resistor R1, the other port of the resistor R2 is connected to the output port of the summing operational amplifier circuit 5, and the R1 and the R2 are combined to form the amplification factor of the summing operational amplifier circuit, wherein the amplification factor is 1+ (R2/R1):
Va＝[1+(R2/R1)]×∑(V1、V2...Vn)
va is shunted into direct current signals of Va1 and Va2 after passing through the direct current shunt unit 6. The direct current Va1 signal is input to the homodromous input port of the high-speed subtraction unit 9. The other dc signal Va2 is input to the AD input 1 port of the control processing unit 8. The other AD input 2 port of the control processing unit 8 is connected to the output port of the temperature sensor 7.
The DA output 1 port Va3 of the control processing unit 8 is voltage-connected to the inverting input port of the high-speed subtracting unit 9.
The output port Vb of the high-speed subtraction unit 9 is connected to the input port of the direct current shunt unit 10;
the dc branching unit 10 branches two groups of signals, one Vb1 is a video detection signal, and the other Vb2 signal is fed back and input to the AD input 3 port of the control processing unit 8. The control processing unit 8 performs software self-adaptive judgment on the collected Vb2 voltage according to the following judgment criteria: when the collected Vb2 voltage is a positive value and exceeds the maximum reference voltage required by system indexes, the output voltage Va3 is controlled to increase; and when the acquired voltage Vb2 is a negative value and exceeds the maximum reference voltage required by the system index, the voltage Va3 output by the control is reduced. The regulated Va3 voltage is terminated until the Vb2 voltage meets near the zero voltage.
When the circuit is under different temperature changes, due to the corresponding change of the noise integral power of internal devices, the Va1 input to the equidirectional input port of the high-speed subtraction circuit 9 also changes, when the temperature rises, the temperature rise information is collected through the temperature sensor, the voltage collected by the Va2 is reduced, the voltage of the Vb2 is increased to a negative value, and at the moment, the output Va3 is controlled to be reduced through the control processing unit 8 until the voltage of the Vb2 tends to zero voltage; when the temperature is reduced, the temperature reduction information is collected through the temperature sensor, the voltage collected by the Va2 is increased, the voltage of the Vb2 is increased towards positive voltage, and the output Va3 is controlled to be increased until the voltage of the Vb2 is close to zero voltage through the control processing unit 8.
In an operating mode, after a zero point control enable EN2 signal is invalid, an externally input broadband radio frequency signal is a continuous wave or a pulse signal, the external signal is directly transmitted to the broadband power divider 3 through the broadband single-pole single-throw switch 1, the signal respectively enters the detector group 4 after the dynamic range of the signal is expanded by the broadband power divider 3, the signal enters the high-speed subtraction unit 9 under the summation of the summation operational amplifier circuit 5, the signal is subtracted from a given threshold voltage Va3 of the control processing unit to output a Vb voltage, and the Vb voltage outputs a dynamically variable video detection output signal Vb1 after passing through the direct current shunt unit 10.
The circuit of the invention is based on zero control enabling and temperature sensors, a first port of a processing unit collects temperature change, a third port collects and outputs video detection signals, the problem that under the influence of temperature change, detection voltage change generated after radio frequency signals are integrated on video substrate noise power and change of corresponding reference voltage can be solved in a self-adaptive mode, difference voltage formed by the detection voltage change and the change of the corresponding reference voltage can generate large discrete change, a second collection port collects the detection voltage change after summation, a group of memorized data tables are stored in a control processing unit, and then the changed reference voltage is output through the control processing unit. The summed detection voltage and the reference voltage can output a stable zero voltage through a high-speed subtraction circuit. The zero voltage is self-adaptive and stable, so that the accuracy of the initial video detection voltage among a plurality of assemblies can be improved, the discreteness of devices with different temperature changes among a plurality of modules is improved, the temperature adaptability of the video detection module is widened, the detection amplitude consistency of the video module is improved, the detection accuracy of the whole detection system is improved, the yield is high, the software self-adaptive video circuit with the zero voltage stability is provided, the debugging workload is low, the consistency of the video zero voltage can be automatically calibrated in an unattended mode, and the like.
Claims (8)
1. The video detection circuit with the self-adaptive stable zero point is characterized by comprising a broadband single-pole single-throw switch (1), a broadband power divider (3), a detector group (4), a summing and operational amplifier unit (5) and a direct current shunt unit (6) which are connected in sequence, wherein the direct current shunt unit (6) comprises a Va1 signal output end and a Va2 signal output end, a Va1 signal output end is connected with a homodromous input end of a high-speed subtraction unit (9), a Va2 signal output end is connected with a first input end of a control processing unit (8), a temperature sensor (7) is connected with a second input end of the control processing unit (8), a zero point control enabling EN (2) is connected with an enabling end of the control processing unit (8), a Va3 signal output end of the control processing unit (8) is connected with a reverse input end of the high-speed subtraction unit (9), a Vb signal output end of the high-speed subtraction unit (9) is, and a Vb2 signal output end of the direct current shunt unit (10) is connected to a third input port of the control processing unit (8), and a Vb1 signal output end of the direct current shunt unit (10) is used for outputting a video detection signal.
2. The adaptive zero point stabilized video detection circuit according to claim 1, wherein the output ports of the wideband power divider (3) are respectively connected to the detector group (4), and the detector group (4) outputs a plurality of signals which are commonly connected to the same-direction port of the summing and operational amplifier circuit (5); the reverse ports of the summing operational amplifier circuit (5) are respectively connected with one ends of a first resistor R1 and a second resistor R2, the other end of the first resistor R1 is grounded, and the other end of the second resistor R2 is connected with the output port of the summing operational amplifier circuit (5).
3. The adaptive zero-stabilized video detection circuit according to claim 1, wherein the wideband power divider (2) is designed with a 50 ohm matching wideband.
4. The adaptive zero-stabilized video detector circuit according to claim 1, wherein the detector group (4) is integrated on an MMIC chip of GaAs technology.
5. The adaptive zero-stabilized video detection circuit according to claim 1, wherein the control processing unit (8) employs an ATMEGA2560-16AU chip.
6. An operating method of a self-adaptive zero-stabilized video detection circuit, comprising a self-adaptive zero calibration mode and an operating mode, wherein:
adaptive zero calibration mode: enabling an EN (2) signal to be effective in zero control, isolating an externally input broadband radio-frequency signal through a broadband single-pole single-throw switch (1), dividing an internal noise signal into n paths of radio-frequency signals after passing through a broadband power divider (3), and converting each path of corresponding radio-frequency signal into direct-current signals V1-Vn through a detector group (4) to be output;
since V1-Vn will change at different temperatures, the dc amplified signal Va outputted by the summing op-amp circuit (5) will also change, one port of the first resistor R1 is connected to the inverting input port of the summing op-amp circuit (5), the other port of the first resistor R1 is grounded, one port of the second resistor R2 is connected to the inverting input port of the summing op-amp circuit (5), the other port of the second resistor R2 is connected to the output port of the summing op-amp circuit (5), the first resistor R1 and the second resistor R2 are combined to be the amplification factor of the summing op-amp circuit, the amplification factor is 1+ (R2/R1):
Va＝[1+(R2/R1)]×∑(V1、V2...Vn)
the direct-current amplified signal Va output by the summing operational amplifier circuit (5) is divided into a Va1 signal and a Va2 signal after passing through a direct-current dividing unit (6), wherein a Va1 signal is input to a homodromous input end of a high-speed subtracting unit (9), a Va2 signal is input to a first input port of a control processing unit (8), the other AD input 2 port of the control processing unit (8) is connected to an output port of a temperature sensor (7), and the temperature sensor (7) is connected to a second input port of the control processing unit (8);
the Va3 signal output end of the control processing unit (8) is connected to the reverse input end of the high-speed subtraction unit (9), and the Vb signal output end of the high-speed subtraction unit (9) is connected to the direct current shunt unit (10); the direct current shunt unit (10) shunts two groups of signals, namely Vb1 and Vb2, a Vb1 signal output end is used for outputting a video detection signal, a Vb2 signal output end is connected to a third input port of the control processing unit (8), the control processing unit (8) carries out self-adaptive judgment on the collected Vb2 signal, and the voltage of the Va3 signal is adjusted until the voltage of the Vb2 signal approaches to zero voltage;
when the circuit is under different temperature changes, due to the corresponding change of the noise integral power of internal devices, the Va1 signal input to the equidirectional input port of the high-speed subtraction circuit (9) is changed, and the control processing unit (8) controls and outputs the Va3 signal, so that the self-adaptive stable zero point calibration under the temperature change is completed;
under the working mode, because the zero control enable EN (2) signal is invalid, for the broadband radio-frequency signal input from the outside, the external signal is directly transmitted to the broadband power divider (3) through the broadband single-pole single-throw switch (1), the signal respectively enters the detector group (4) after the dynamic range of the signal is expanded by the broadband power divider (3), the obtained direct-current amplification signal Va enters the high-speed subtraction unit (9) through the direct-current shunt unit (6) under the summation of the summation operational amplifier circuit (5), the direct-current amplification signal Va is subtracted from the Va3 signal of the control processing unit (8) to output a Vb signal voltage, and the Vb signal voltage outputs a dynamically-changed video detection output Vb1 signal after passing through the direct-current shunt unit (10).
7. The working method of the self-adaptive zero point stabilizing video detection circuit according to claim 6, wherein the control processing unit (8) performs self-adaptive judgment on the collected Vb2 signal, and adjusts the voltage of the Va3 signal until the voltage of the Vb2 signal approaches the zero point voltage according to the following judgment: when the collected Vb2 signal voltage is a positive value and exceeds the maximum reference voltage required by system indexes, the Va3 signal voltage output by control is increased; when the acquired Vb2 signal voltage is a negative value and exceeds the maximum reference voltage required by system indexes, the output Va3 signal voltage is reduced through control, and the adjustment of the Va3 signal voltage is stopped until the Vb2 signal voltage approaches to the zero voltage.
8. The method of claim 6, wherein the adaptive stable zero calibration under temperature variation is as follows:
when the temperature rises, the temperature rise information is collected through the temperature sensor (7), the voltage collected by the Va2 signal is reduced, the voltage of the Vb2 signal is increased towards a negative value, and the output Va3 signal is controlled to be reduced through the control processing unit (8) until the voltage of the Vb2 signal approaches to zero voltage; when the temperature is reduced, the temperature reduction information is collected through the temperature sensor (7), the voltage of the Va2 signal is increased, the voltage of the Vb2 signal is increased towards positive voltage, the output Va3 signal is controlled to be increased through the control processing unit (8) until the voltage of the Vb2 signal approaches to zero voltage, and self-adaptive stable zero point calibration under temperature change is completed.
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