CN204119217U - A kind of open loop approach that adopts realizes receiver fast gain Circuit tuning - Google Patents
A kind of open loop approach that adopts realizes receiver fast gain Circuit tuning Download PDFInfo
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- CN204119217U CN204119217U CN201420517239.1U CN201420517239U CN204119217U CN 204119217 U CN204119217 U CN 204119217U CN 201420517239 U CN201420517239 U CN 201420517239U CN 204119217 U CN204119217 U CN 204119217U
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Abstract
The utility model relates to a kind of open loop approach that adopts and realizes receiver fast gain Circuit tuning, and the design comprises the design and comprises the detecting circuit be made up of wave detector U1 etc., two hysteresis comparators be made up of operational amplifier U3A and operational amplifier U3B etc., the two groups of single-pole double-throw switch (SPDT)s be made up of PIN pipe D1, PIN pipe D2 and PIN pipe D3, PIN pipe D4, resistance R17, resistance R19 and and the π type attenuator that forms of resistance R20 and radio frequency amplifier U2.The design's entire gain adjustment response speed is exceedingly fast, and has that speed is fast, time delay is little, low in energy consumption, debugging is convenient, circuit stability is good, circuit structure is simple, reliability high.The design is exclusively used on the high speed mobile vehicles such as flight, navigation and carries out received signal power adjustment use in receiver front end design.
Description
Technical field
The utility model relates to receiver, and particularly one adopts open loop approach to realize receiver fast gain Circuit tuning.
Background technology
Receiver gain adjustment circuit is a kind of functional circuit.In a receiving system, generally need to carry out frequency-conversion processing to the received signal, when the dynamic range that the signal amplitude received is too small or big city exceeds frequency mixer excessively, make frequency conversion occur distortion, therefore receiver needs to carry out Gain tuning, and signal power is stabilized between given zone.
Current, gain adjustment circuit mainly adopts open loop circuit and closed loop circuit two kinds of modes to realize.When receiving equipment the signal amplitude of high-speed mobile or reception at Rapid Variable Design time, then need a kind of gain adjustment circuit that can respond fast, existing gain adjustment circuit can not realize quick response.
Summary of the invention
The purpose of this utility model is to provide a kind of open loop approach that adopts and realizes receiver fast gain Circuit tuning.Attenuator and amplifier are connected in receiver by the design, detecting circuit is placed in receiver foremost, for monitoring the amplitude of current Received Signal and being converted into level signal, detection outputs level signals is made comparisons with the preset level of two hysteresis comparators respectively and is exported double switch control signal, whether the π type attenuator that one tunnel controls to be made up of resistance is opened, whether one tunnel controls radio frequency amplifier and opens, and realizes link gain adjustment, signal power is stabilized between given zone.The preset level of two hysteresis comparators correspond to the threshold value receiving signal power, the signal power stable region that this circuit can be regulated to export by amendment hysteresis comparator preset level.
The technical scheme that the utility model is adopted for achieving the above object is: a kind of open loop approach that adopts realizes receiver fast gain Circuit tuning, it is characterized in that: comprise wave detector U1, radio frequency amplifier U2, operational amplifier U3A and operational amplifier U3B, wave detector U1 adopt AD8307 detection tube, one end of 4 pin contact resistance R13 of AD8307 detection tube, one end of electric capacity C3, one end of electric capacity C1, 2 pin of operational amplifier U3A, one end of electric capacity C2 and 6 pin of operational amplifier U3B, the other end of electric capacity C1 and 3 pin of operational amplifier U3A, one end of resistance R6 connects rear by resistance R7 ground connection, and 3 pin of operational amplifier U3A pass through 8 pin of resistance R1 and operational amplifier U3A, one end of resistance R2, the collector electrode of triode T2, power supply VCC is met, the other end of the 1 pin contact resistance R6 of operational amplifier U3A after the collector electrode connection of triode T3, one end of resistance R5 and one end of resistance R4, one end of other end contact resistance R3 of resistance R2 and the collector electrode of triode T1, the other end of resistance R5, the base stage of the other end of resistance R4 and the other end difference connecting triode T1 of resistance R3, the base stage of triode T3 and the base stage of triode T2,4 pin of operational amplifier U3A and the equal ground connection of emitter of triode T1, the other end of electric capacity C2 and 5 pin of operational amplifier U3B, one end of resistance R14 connects rear by resistance R16 ground connection, 5 pin of operational amplifier U3B pass through 8 pin of resistance R9 and operational amplifier U3B, one end of resistance R10, the collector electrode of triode T5, power supply VCC is met after the collector electrode connection of triode T6, the other end of the 7 pin contact resistance R14 of operational amplifier U3B, one end of resistance R15 and one end of resistance R12, one end of other end contact resistance R11 of resistance R10 and the collector electrode of triode T4, the other end of resistance R15, the base stage of the other end of resistance R12 and the other end difference connecting triode T4 of resistance R11, the base stage of triode T6 and the base stage of triode T5, 4 pin of operational amplifier U3B and the equal ground connection of emitter of triode T4, 6 pin and 7 pin of AD8307 detection tube meet power supply VCC by resistance R8, 6 pin of AD8307 detection tube and 7 pin are by electric capacity C4 ground connection, 1 pin of AD8307 detection tube is by electric capacity C5 ground connection, the equal ground connection of the other end of 2 pin of AD8307 detection tube, the other end of resistance R13 and electric capacity C3, 8 pin of AD8307 detection tube pass through one end of electric capacity C6 connection signal input and electric capacity C10, the other end of electric capacity C10 connects one end of inductance L 6 and 3 pin of PIN pipe D1, the other end of inductance L 6 is by resistance R18 ground connection, 1 pin of PIN pipe D1 connects 2 pin of PIN pipe D2, and the emitter of triode T2 is connected to by inductance L 1, 2 pin of PIN pipe D1 connect one end of inductance L 7 and one end of resistance R17, and the emitter of triode T3 is connected to by inductance L 2, simultaneously by resistance R19 ground connection, the other end of inductance L 7 is connected 1 pin of PIN pipe D2 with the other end of resistance R17, simultaneously by resistance R120 ground connection, 3 pin of PIN pipe D2 connect one end of inductance L 8 and one end of electric capacity C12, the other end of inductance L 8 is by resistance R21 ground connection, the other end of electric capacity C12 connects one end of inductance L 9 and 3 pin of PIN pipe D3, the other end of inductance L 9 is by resistance R22 ground connection, 1 pin of PIN pipe D3 connects one end of electric capacity C11, and the emitter of triode T5 is connected to by inductance L 3, the other end of electric capacity C11 connects 1 pin of radio frequency amplifier U2, 2 pin of PIN pipe D3 connect 1 pin of PIN pipe D4, and the emitter of triode T6 is connected to by inductance L 4, the 3 pin ground connection of radio frequency amplifier U2, 2 pin connect 2 pin of PIN pipe D4 by electric capacity C13, and one end of electric capacity C7 is connected by inductance L 5, power supply VCC is met behind one end of electric capacity C8 and one end of electric capacity C9, the other end of electric capacity C7, the other end of electric capacity C8 and the equal ground connection of the other end of electric capacity C9, 3 pin of PIN pipe D4 connect one end of inductance L 10 and one end of electric capacity C14, the other end of inductance L 10 is by resistance R23 ground connection, the other end of electric capacity C14 is signal output part.
The beneficial effects of the utility model and feature: the design adopts open loop approach to realize Gain tuning, entire gain adjustment response speed is exceedingly fast, and gain stabilization interval is convenient to be regulated, and controls dynamic range larger; Have that speed is fast, time delay is little, low in energy consumption, debugging is convenient, circuit stability is good, circuit structure is simple, reliability high.The design is exclusively used on the high speed mobile vehicles such as flight, navigation and carries out received signal power adjustment use in receiver front end design.
Accompanying drawing explanation
Fig. 1 is the utility model electrical schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
With reference to Fig. 1, the design comprises the detecting circuit be made up of wave detector U1 etc., two hysteresis comparators be made up of operational amplifier U3A and operational amplifier U3B etc., the two groups of single-pole double-throw switch (SPDT)s be made up of PIN pipe D1, PIN pipe D2 and PIN pipe D3, PIN pipe D4, resistance R17, resistance R19 and and the π type attenuator that forms of resistance R20 and radio frequency amplifier U2.The AD8307 detection tube that wave detector U1 selection and comparison in detecting circuit is common, can realize larger dynamic range; Hysteresis comparator adopts two-way operational amplifier (operational amplifier U3A and operational amplifier U3B) TLV3202 to build, and preset level and hysteretic threshold can realize by regulating the feedback resistance of operational amplifier.The single-pole double-throw switch (SPDT) being used in radio circuit adopts PIN switch to realize, that PIN pipe D1, PIN pipe D2, PIN pipe D3 and PIN pipe D4 adopts is HSMP-389F, the attenuator be connected in radio frequency link adopts resistance π type attenuator to realize, and radio frequency amplifier U2 adopts radio frequency signals drive amplifier HMC580.
The design's operation principle: detecting circuit wave detector U1 detects the amplitude of radiofrequency signal, and be converted into level output; The threshold level of the hysteresis comparator built with operational amplifier U3A and operational amplifier U3B can adjust respectively by resistance R1, resistance R6, resistance R7, resistance R9, resistance R16 and resistance R17, the level of wave detector U1 exports makes comparisons with the threshold level of operational amplifier U3A and operational amplifier U3B respectively, export a corresponding low and high level in road as control signal, the inverter that this control signal is consisted of triode T1, triode T4 exports a road auxiliary control signal; Control signal and auxiliary control signal control conducting and the closedown of common cathode PIN pipe D1, PIN pipe D2 and PIN pipe D3, PIN pipe D4 by triode T2, triode T3 and triode T5, triode T6; Whether PIN pipe switch control rule resistance π type attenuator and radio frequency amplifier U2 access radio frequency link, thus the gain achieving link controls.
Claims (1)
1. adopt open loop approach to realize a receiver fast gain Circuit tuning, it is characterized in that: comprise wave detector U1, radio frequency amplifier U2, operational amplifier U3A and operational amplifier U3B, wave detector U1 adopt AD8307 detection tube, one end of 4 pin contact resistance R13 of AD8307 detection tube, one end of electric capacity C3, one end of electric capacity C1, 2 pin of operational amplifier U3A, one end of electric capacity C2 and 6 pin of operational amplifier U3B, the other end of electric capacity C1 and 3 pin of operational amplifier U3A, one end of resistance R6 connects rear by resistance R7 ground connection, and 3 pin of operational amplifier U3A pass through 8 pin of resistance R1 and operational amplifier U3A, one end of resistance R2, the collector electrode of triode T2, power supply VCC is met, the other end of the 1 pin contact resistance R6 of operational amplifier U3A after the collector electrode connection of triode T3, one end of resistance R5 and one end of resistance R4, one end of other end contact resistance R3 of resistance R2 and the collector electrode of triode T1, the other end of resistance R5, the base stage of the other end of resistance R4 and the other end difference connecting triode T1 of resistance R3, the base stage of triode T3 and the base stage of triode T2,4 pin of operational amplifier U3A and the equal ground connection of emitter of triode T1, the other end of electric capacity C2 and 5 pin of operational amplifier U3B, one end of resistance R14 connects rear by resistance R16 ground connection, 5 pin of operational amplifier U3B pass through 8 pin of resistance R9 and operational amplifier U3B, one end of resistance R10, the collector electrode of triode T5, power supply VCC is met after the collector electrode connection of triode T6, the other end of the 7 pin contact resistance R14 of operational amplifier U3B, one end of resistance R15 and one end of resistance R12, one end of other end contact resistance R11 of resistance R10 and the collector electrode of triode T4, the other end of resistance R15, the base stage of the other end of resistance R12 and the other end difference connecting triode T4 of resistance R11, the base stage of triode T6 and the base stage of triode T5, 4 pin of operational amplifier U3B and the equal ground connection of emitter of triode T4, 6 pin and 7 pin of AD8307 detection tube meet power supply VCC by resistance R8, 6 pin of AD8307 detection tube and 7 pin are by electric capacity C4 ground connection, 1 pin of AD8307 detection tube is by electric capacity C5 ground connection, the equal ground connection of the other end of 2 pin of AD8307 detection tube, the other end of resistance R13 and electric capacity C3, 8 pin of AD8307 detection tube pass through one end of electric capacity C6 connection signal input and electric capacity C10, the other end of electric capacity C10 connects one end of inductance L 6 and 3 pin of PIN pipe D1, the other end of inductance L 6 is by resistance R18 ground connection, 1 pin of PIN pipe D1 connects 2 pin of PIN pipe D2, and the emitter of triode T2 is connected to by inductance L 1, 2 pin of PIN pipe D1 connect one end of inductance L 7 and one end of resistance R17, and the emitter of triode T3 is connected to by inductance L 2, simultaneously by resistance R19 ground connection, the other end of inductance L 7 is connected 1 pin of PIN pipe D2 with the other end of resistance R17, simultaneously by resistance R120 ground connection, 3 pin of PIN pipe D2 connect one end of inductance L 8 and one end of electric capacity C12, the other end of inductance L 8 is by resistance R21 ground connection, the other end of electric capacity C12 connects one end of inductance L 9 and 3 pin of PIN pipe D3, the other end of inductance L 9 is by resistance R22 ground connection, 1 pin of PIN pipe D3 connects one end of electric capacity C11, and the emitter of triode T5 is connected to by inductance L 3, the other end of electric capacity C11 connects 1 pin of radio frequency amplifier U2, 2 pin of PIN pipe D3 connect 1 pin of PIN pipe D4, and the emitter of triode T6 is connected to by inductance L 4, the 3 pin ground connection of radio frequency amplifier U2, 2 pin connect 2 pin of PIN pipe D4 by electric capacity C13, and one end of electric capacity C7 is connected by inductance L 5, power supply VCC is met behind one end of electric capacity C8 and one end of electric capacity C9, the other end of electric capacity C7, the other end of electric capacity C8 and the equal ground connection of the other end of electric capacity C9, 3 pin of PIN pipe D4 connect one end of inductance L 10 and one end of electric capacity C14, the other end of inductance L 10 is by resistance R23 ground connection, the other end of electric capacity C14 is signal output part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420517239.1U CN204119217U (en) | 2014-09-10 | 2014-09-10 | A kind of open loop approach that adopts realizes receiver fast gain Circuit tuning |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420517239.1U CN204119217U (en) | 2014-09-10 | 2014-09-10 | A kind of open loop approach that adopts realizes receiver fast gain Circuit tuning |
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| CN204119217U true CN204119217U (en) | 2015-01-21 |
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| CN201420517239.1U Active CN204119217U (en) | 2014-09-10 | 2014-09-10 | A kind of open loop approach that adopts realizes receiver fast gain Circuit tuning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957309A (en) * | 2018-08-27 | 2018-12-07 | 深圳众城卓越科技有限公司 | The circuit and method for being attracted situation for detecting contactor |
-
2014
- 2014-09-10 CN CN201420517239.1U patent/CN204119217U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957309A (en) * | 2018-08-27 | 2018-12-07 | 深圳众城卓越科技有限公司 | The circuit and method for being attracted situation for detecting contactor |
| CN108957309B (en) * | 2018-08-27 | 2023-12-29 | 深圳众城卓越科技有限公司 | Circuit and method for detecting contactor suction condition |
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