CN204116481U - A kind of cryogenic low noise amplifier Working state checking circuit - Google Patents
A kind of cryogenic low noise amplifier Working state checking circuit Download PDFInfo
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- CN204116481U CN204116481U CN201420508908.9U CN201420508908U CN204116481U CN 204116481 U CN204116481 U CN 204116481U CN 201420508908 U CN201420508908 U CN 201420508908U CN 204116481 U CN204116481 U CN 204116481U
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- divider resistance
- voltage
- voltage comparator
- low noise
- noise amplifier
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Abstract
本实用新型提供一种低温放大器工作状态检测电路，包括采样电阻、仪表放大器、电压跟随器和电压比较器，采样电阻的电流输入端与仪表放大器的同相输入端连接，采样电阻的电流输出端与仪表放大器的反相输入端连接，仪表放大器的输出端通过电压跟随器连接到电压比较器的第一反相输入端与第二同相输入端之间的节点，电压比较器的第一同相输入端连接到第一参考电压生成电路的输出端，电压比较器的第二反相输入端连接到第二参考电压生成电路的输出端，第一参考电压大于第二参考电压，电压比较器的第一输出端与第二输出端之间的节点连接到电压表。本实用新型实用性强，能够对传统测量方式进行备份，满足特殊工程应用。
The utility model provides a working state detection circuit of a low-temperature amplifier, which includes a sampling resistor, an instrument amplifier, a voltage follower and a voltage comparator, the current input end of the sampling resistor is connected with the in-phase input end of the instrument amplifier, and the current output end of the sampling resistor is connected The inverting input of the instrumentation amplifier is connected, the output of the instrumentation amplifier is connected to the node between the first inverting input and the second non-inverting input of the voltage comparator through a voltage follower, and the first non-inverting input of the voltage comparator end is connected to the output end of the first reference voltage generation circuit, the second inverting input end of the voltage comparator is connected to the output end of the second reference voltage generation circuit, the first reference voltage is greater than the second reference voltage, the first reference voltage of the voltage comparator A node between the first output and the second output is connected to a voltmeter. The utility model has strong practicability, can back up the traditional measuring method, and satisfies special engineering applications.
Description
Technical field
The utility model relates to microwave electron technical field, specifically a kind of cryogenic low noise amplifier Working state checking circuit.
Background technology
Cryogenic low noise amplifier is one of core devices of low-temperature receiver, decides the success or failure of whole receiving system.Low-temperature receiver is mainly used in extremely highly sensitive astronomical sight and military investigation radar, and therefore, the duty detecting cryogenic low noise amplifier is in real time very necessary.Traditional cryogenic low noise amplifier duty detection mode gathers electric current and voltage by MCU, and judge that whether amplifier operation is normal by liquid crystal display display working current, and this mode can judge the duty of amplifier more intuitively.But, can not normally show when liquid crystal display breaks down, and neighbouring without dependence test instrument time, the amplifier operation state in cooled cryostat just cannot intuitively show.If whole receiving system work is abnormal, then cannot accurate decision problem place.
Utility model content
The purpose of this utility model is to provide a kind of cryogenic low noise amplifier Working state checking circuit, when the liquid crystal display of traditional measurement mode break down cisco unity malfunction and neighbouring without dependence test instrument time, just can learn that whether cryogenic low noise amplifier work normal by means of only voltage table.
The technical solution of the utility model is:
A kind of cryogenic low noise amplifier Working state checking circuit, comprise the sampling resistor be serially connected in cryogenic low noise amplifier performance loop, also comprise instrument amplifier, voltage follower and voltage comparator, the current input terminal of described sampling resistor is connected with the in-phase input end of instrument amplifier, the current output terminal of described sampling resistor is connected with the inverting input of instrument amplifier, the output terminal of described instrument amplifier is connected to the node between the first inverting input of voltage comparator and the second in-phase input end by voltage follower, first in-phase input end of described voltage comparator is connected to the output terminal of the first reference voltage generating circuit, second inverting input of described voltage comparator is connected to the output terminal of the second reference voltage generating circuit, described first reference voltage is greater than the second reference voltage, node between first output terminal of described voltage comparator and the second output terminal is connected to voltage table.
Described cryogenic low noise amplifier Working state checking circuit, described instrument amplifier is made up of instrument amplifier chip and peripheral circuit thereof, and described instrument amplifier chip selects INA122 cake core.
Described cryogenic low noise amplifier Working state checking circuit, described voltage follower is made up of operational amplifier chip and peripheral circuit thereof, and described operational amplifier chip selects OPA2277 cake core.
Described cryogenic low noise amplifier Working state checking circuit, described voltage comparator is made up of voltage comparator chip and peripheral circuit thereof, and described voltage comparator chip selects LM119 cake core.
Described cryogenic low noise amplifier Working state checking circuit, described first reference voltage generating circuit is made up of the first divider resistance, the second divider resistance and the 3rd divider resistance, one end of described first divider resistance is connected to supply voltage, and the other end passes through and the second divider resistance connect and the 3rd divider resistance ground connection; Described first divider resistance, node between the second divider resistance and the 3rd divider resistance three are connected to the first in-phase input end of voltage comparator;
Described second reference voltage generating circuit is made up of the 4th divider resistance, the 5th divider resistance and the 6th divider resistance, and one end of described 4th divider resistance is connected to supply voltage, and the other end passes through and the 5th divider resistance connect and the 6th divider resistance ground connection; Described 4th divider resistance, node between the 5th divider resistance and the 6th divider resistance three are connected to the second inverting input of voltage comparator;
Described cryogenic low noise amplifier Working state checking circuit, described supply voltage is 5 volts, described first divider resistance is 1.2 kilo-ohms, described second divider resistance and the 3rd divider resistance are 10 kilo-ohms, described 4th divider resistance is 5.1 kilo-ohms, and described 5th divider resistance and the 6th divider resistance are 2.7 kilo-ohms.
The beneficial effects of the utility model are:
(1) back up traditional measurement mode, when the liquid crystal display of traditional measurement mode breaks down, whether the duty that the utility model can detect cryogenic low noise amplifier is in real time normal;
(2) if whole low temperature receiving system breaks down, malfunction elimination scope can being reduced, racing against time for dealing with problems, meet special engineering application.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
The utility model is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of cryogenic low noise amplifier Working state checking circuit, comprises sample circuit 1 instrument amplifier circuit 2, voltage follower circuit 3, voltage comparator circuit 4, first reference voltage generating circuit 5 and the second reference voltage generating circuit 6.Sample circuit 1 is formed primarily of the sampling resistor R1 be serially connected in cryogenic low noise amplifier performance loop.
Instrument amplifier circuit 2 comprises resistance R2, R3 and R4 and the filter capacitor C1 that instrument amplifier chip IC 1, three calculates enlargement factor.Instrument amplifier chip IC 1 selects INA122 cake core, two gains being connected to instrument amplifier chip IC 1 of being together in series with resistance R2 again after resistance R3 and R4 parallel connection are arranged holds RG, one end of filter capacitor C1 connects the feeder ear V+ of instrument amplifier chip IC 1, other end ground connection.
Instrument amplifier circuit 2 is for amplifying the weak voltage value on sampling resistor R1, the in-phase input end VIN+ that a wire is connected to instrument amplifier chip IC 1 is drawn from the current input terminal of sampling resistor R1, draw from the current output terminal of sampling resistor R1 the inverting input VIN-that a wire is connected to instrument amplifier chip IC 1, the sampled voltage after amplification exports from the output terminal VO of instrument amplifier chip IC 1.
Voltage follower circuit 3 comprises operational amplifier chip IC 2 and filter capacitor C2, and operational amplifier chip IC 2 selects OPA2277 cake core, the feeder ear V+ of one end concatenation operation amplifier chip IC2 of filter capacitor C2, other end ground connection.From the in-phase input end INA+ of the voltage access operational amplifier chip IC 2 that instrument amplifier circuit 2 exports, and export from the output terminal OUTA of operational amplifier chip IC 2, the inverting input INA-of operational amplifier chip IC 2 and output terminal OUTA short circuit.Voltage follower circuit 3, for connecting instrument amplifier circuit 2 and voltage comparator circuit 4, reduces its impact brought that is directly connected, plays buffer action.
Voltage comparator circuit 4 comprises voltage comparator chip IC 3, pull-up resistor R5 and filter capacitor C3, voltage comparator chip IC 3 selects LM119 cake core, one end of pull-up resistor R5 connects the feeder ear V+ of voltage comparator chip IC 3, the other end connects the first output terminal OUTPUT1 of voltage comparator chip IC 3, one end of filter capacitor C3 connects the feeder ear V+ of voltage comparator chip IC 3, other end ground connection.
The window comparator connection be made up of voltage comparator chip IC 3 is: the first inverting input INPUT1-and the second in-phase input end INPUT2+ of voltage comparator chip IC 3 link together as input end, first output terminal OUTPUT1 and the second output terminal OUTPUT2 of voltage comparator chip IC 3 link together as output terminal, first in-phase input end INPUT1+ of voltage comparator chip IC 3 is connected to the output terminal of the first reference voltage generating circuit 5, second inverting input INPUT2-of voltage comparator chip IC 3 is connected to the output terminal of the second reference voltage generating circuit 6, first reference voltage is high level thresholding UTH, second reference voltage is low level thresholding UTL.
First reference voltage generating circuit 5 is made up of the first divider resistance R6, the second divider resistance R7 and the 3rd divider resistance R8, one end of first divider resistance R6 is connected to supply voltage, the other end passes through and the second divider resistance R7 connect and the 3rd divider resistance R8 ground connection, and the first divider resistance R6, node between the second divider resistance R7 and the 3rd divider resistance R8 three are connected to the first in-phase input end INPUT1+ of voltage comparator chip IC 3.
Second reference voltage generating circuit 6 is made up of the 4th divider resistance R9, the 5th divider resistance R10 and the 6th divider resistance R11, one end of 4th divider resistance R9 is connected to supply voltage, and the other end passes through and the 5th divider resistance R10 connect and the 6th divider resistance R11 ground connection; 4th divider resistance R9, node between the 5th divider resistance R10 and the 6th divider resistance R11 three are connected to the second inverting input INPUT2-of voltage comparator chip IC 3.
Supply voltage is 5 volts, and the first divider resistance R6 is 1.2 kilo-ohms, and the second divider resistance R7 and the 3rd divider resistance R8 is 10 kilo-ohms, and the 4th divider resistance R9 is 5.1 kilo-ohms, and the 5th divider resistance R10 and the 6th divider resistance R11 is 2.7 kilo-ohms.
Principle of work of the present utility model:
The working current normally worked due to cryogenic low noise amplifier is a scope, and high level thresholding UTH and low level thresholding UTL is determined by the pressure drop of this range of current on sampling resistor R1.Sampling resistor R1 is serially connected in the performance loop of cryogenic low noise amplifier, when cryogenic low noise amplifier works, sampling resistor R1 will produce a faint sampled voltage signal, this faint sampled voltage signal passes through voltage follower circuit 3 input voltage comparator circuit 4 again after instrument amplifier circuit 2 is amplified, when input voltage is between the high level thresholding UTH and low level thresholding UTL of voltage comparator circuit 3, voltage comparator circuit 4 exports high level, represent that cryogenic low noise amplifier is working properly, when input voltage is less than low level thresholding UTL or be greater than high level thresholding UTH, voltage comparator circuit 4 output low level, represent cryogenic low noise amplifier operation irregularity.
Like this, the duty of cryogenic low noise amplifier can just be detected by a voltage table, very simply.In actual application, testing circuit of the present utility model can do very little, is convenient to install, and has very strong practicality.
The above embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that claims of the present utility model determine.
Claims (6)
1. a cryogenic low noise amplifier Working state checking circuit, comprise the sampling resistor be serially connected in cryogenic low noise amplifier performance loop, it is characterized in that: also comprise instrument amplifier, voltage follower and voltage comparator, the current input terminal of described sampling resistor is connected with the in-phase input end of instrument amplifier, the current output terminal of described sampling resistor is connected with the inverting input of instrument amplifier, the output terminal of described instrument amplifier is connected to the node between the first inverting input of voltage comparator and the second in-phase input end by voltage follower, first in-phase input end of described voltage comparator is connected to the output terminal of the first reference voltage generating circuit, second inverting input of described voltage comparator is connected to the output terminal of the second reference voltage generating circuit, described first reference voltage is greater than the second reference voltage, node between first output terminal of described voltage comparator and the second output terminal is connected to voltage table.
2. cryogenic low noise amplifier Working state checking circuit according to claim 1, is characterized in that: described instrument amplifier is made up of instrument amplifier chip and peripheral circuit thereof, described instrument amplifier chip selects INA122 cake core.
3. cryogenic low noise amplifier Working state checking circuit according to claim 1, is characterized in that: described voltage follower is made up of operational amplifier chip and peripheral circuit thereof, described operational amplifier chip selects OPA2277 cake core.
4. cryogenic low noise amplifier Working state checking circuit according to claim 1, is characterized in that: described voltage comparator is made up of voltage comparator chip and peripheral circuit thereof, described voltage comparator chip selects LM119 cake core.
5. cryogenic low noise amplifier Working state checking circuit according to claim 1, it is characterized in that: described first reference voltage generating circuit is made up of the first divider resistance, the second divider resistance and the 3rd divider resistance, one end of described first divider resistance is connected to supply voltage, and the other end passes through and the second divider resistance connect and the 3rd divider resistance ground connection; Described first divider resistance, node between the second divider resistance and the 3rd divider resistance three are connected to the first in-phase input end of voltage comparator;
Described second reference voltage generating circuit is made up of the 4th divider resistance, the 5th divider resistance and the 6th divider resistance, and one end of described 4th divider resistance is connected to supply voltage, and the other end passes through and the 5th divider resistance connect and the 6th divider resistance ground connection; Described 4th divider resistance, node between the 5th divider resistance and the 6th divider resistance three are connected to the second inverting input of voltage comparator.
6. cryogenic low noise amplifier Working state checking circuit according to claim 5, it is characterized in that: described supply voltage is 5 volts, described first divider resistance is 1.2 kilo-ohms, described second divider resistance and the 3rd divider resistance are 10 kilo-ohms, described 4th divider resistance is 5.1 kilo-ohms, and described 5th divider resistance and the 6th divider resistance are 2.7 kilo-ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420508908.9U CN204116481U (en) | 2014-09-04 | 2014-09-04 | A kind of cryogenic low noise amplifier Working state checking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420508908.9U CN204116481U (en) | 2014-09-04 | 2014-09-04 | A kind of cryogenic low noise amplifier Working state checking circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204116481U true CN204116481U (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420508908.9U Expired - Fee Related CN204116481U (en) | 2014-09-04 | 2014-09-04 | A kind of cryogenic low noise amplifier Working state checking circuit |
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| CN (1) | CN204116481U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154137A (en) * | 2016-06-20 | 2016-11-23 | 东莞市联洲知识产权运营管理有限公司 | A fixed-point detection device for an operational amplifier integrated circuit |
| CN106154136A (en) * | 2016-06-20 | 2016-11-23 | 东莞市联洲知识产权运营管理有限公司 | A kind of detection tool of operational amplifier integrated circuit |
-
2014
- 2014-09-04 CN CN201420508908.9U patent/CN204116481U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154137A (en) * | 2016-06-20 | 2016-11-23 | 东莞市联洲知识产权运营管理有限公司 | A fixed-point detection device for an operational amplifier integrated circuit |
| CN106154136A (en) * | 2016-06-20 | 2016-11-23 | 东莞市联洲知识产权运营管理有限公司 | A kind of detection tool of operational amplifier integrated circuit |
| CN106154137B (en) * | 2016-06-20 | 2018-08-17 | 东莞市联洲知识产权运营管理有限公司 | Fixed point detection device of operational amplifier integrated circuit |
| CN106154136B (en) * | 2016-06-20 | 2018-11-16 | 泉州市弘丰农农业技术有限公司 | A kind of detection jig of operational amplifier integrated circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 |