CN204156822U - The amplifier circuit in low noise that the distortion factor is low - Google Patents
The amplifier circuit in low noise that the distortion factor is low Download PDFInfo
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- CN204156822U CN204156822U CN201420600112.6U CN201420600112U CN204156822U CN 204156822 U CN204156822 U CN 204156822U CN 201420600112 U CN201420600112 U CN 201420600112U CN 204156822 U CN204156822 U CN 204156822U
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Abstract
The utility model discloses the amplifier circuit in low noise that the distortion factor is low, comprise power supply U, electric capacity C1 ,-C8, two-stage field effect wide-band amplifier A, low distortion operational amplifier A 1, resistance R1-R6 and choke L, described power supply U connect drop-down electric capacity C1, drop-down electric capacity C2 and drop-down electric capacity C3 successively; Non-capacitive choke L is also connected between the port 2 of described two-stage field effect wide-band amplifier A and power supply U, between the port 3 and port 4 of two-stage field effect wide-band amplifier A, also connect electric capacity C4 and resistance R1 successively, the output of low distortion operational amplifier A 1 also connects the port 4 of two-stage field effect wide-band amplifier A.The utility model, by foregoing circuit, at the bottom of the input signal meeting distortion factor, ensures the quality of signal transmission, and carry out two-stage amplification, even if this circuit is when signal source frequency raises simultaneously, power amplification coefficient power amplification ratio also can not decline, and ensures the stable amplification to signal source small-signal.
Description
Technical field
The utility model relates to amplifier region, is specifically related to the amplifier circuit in low noise that the distortion factor is low.
Background technology
Low noise amplifier is positioned at the front end of receiver, and amplifying small-signal is its Main Function, and for reduction noise jamming, the performance improving whole receiver plays vital effect.Therefore low noise amplifier is the vital microwave parts in radar, communication and electronic countermeasures isoelectronic series system always, has dual-use value widely.Low noise amplifier is as the key component of radio frequency leading portion, and be the basic element of character in communication system equipment, wideband low noise amplifier forms the critical component of transceiver chip and down-conversion chip especially.At present, Conventional wide band low noise amplifier exists when frequency raises, the situation that power amplification coefficient power amplification ratio declines fast, affect amplifier magnification ratio, in addition, the signal that existing low noise amplifier receiving terminal receives does not process, the distortion factor is higher, the quality of impact output signal.
Utility model content
The utility model overcomes the deficiencies in the prior art, the amplifier circuit in low noise that the distortion factor is low is provided, at the bottom of the input signal meeting distortion factor in this circuit, ensure the quality of signal transmission, and carry out two-stage amplification, even if this circuit is when signal source frequency raises simultaneously, power amplification coefficient power amplification ratio also can not decline, and ensures the stable amplification to signal source small-signal.
For solving above-mentioned technical problem, the utility model is by the following technical solutions: the amplifier circuit in low noise that the distortion factor is low, comprise power supply U, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, two-stage field effect wide-band amplifier A, low distortion operational amplifier A 1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 and choke L, described power supply U and connect drop-down electric capacity C1, drop-down electric capacity C2 and drop-down electric capacity C3 successively; Non-capacitive choke L is also connected between the port 2 of described two-stage field effect wide-band amplifier A and power supply U, also electric capacity C4 and resistance R1 is connected successively between the port 3 and port 4 of two-stage field effect wide-band amplifier A, the output of low distortion operational amplifier A 1 also connects the port 4 of two-stage field effect wide-band amplifier A, port 4 ground connection wherein; Between the port one and port 4 of two-stage field effect wide-band amplifier A, also connect electric capacity C5 and resistance R2 successively, be also connected output signal Vout at electric capacity C5 with the common port of resistance R2; Described resistance R3 and resistance R4 connects successively, resistance R4 also connects the input in the same way of low distortion operational amplifier A 1, drop-down electric capacity C8 is also connected at the input in the same way of low distortion operational amplifier A 1, contact resistance R5 is gone back between input and reverse input end in the same way in low distortion operational amplifier A 1, also connect pull down resistor R6 at the reverse input end of low distortion operational amplifier A 1, input signal Vin is inputted by resistance R3; Also be connected electric capacity C7 between the common port of described resistance R3 and resistance R4 and the output of low distortion operational amplifier A 1, low distortion operational amplifier A 1 also connects power supply U, power supply U connects drop-down electric capacity C6.
Signal Vin for input is first processed by low distortion operational amplifier A 1 pair of signal of low distortion, low noise, ensure the quality of signal transmission, and by feedback principle, signal message is amplified 2 times, then again secondary amplification is carried out to signal passing to two-stage field effect wide-band amplifier below, finally again signal is exported.Wherein on two-stage field effect wide-band amplifier, also connect non-capacitive choke, form filtering net to provide little ripple direct current power, stablizing of better guaranteed output amplification coefficient, thus make amplifier realize the stable object of amplifying small-signal.Small-signal exports and can be amplified effective after the process of this circuit, and the output signal clearly that the distortion factor is low, ensures the reliability of amplifier operation.
The resistance of described resistance R5 and resistance R6 is equal is 10 kilo-ohms.Such setting allows the voltage ratio of input signal and output signal be 1:2, and output signal is amplified.
The model of described low distortion operational amplifier A 1 is MAX4478.This amplifier provides rail-to-rail output, and operating voltage can be low to moderate 2.7V.Every road amplifier only consumes the quiescent current of 2.2mA, and has super-low distortion, low input noise density and low input current noise density.Ensure that low distortion and the low noise of signal transmission.
The model of described two-stage field effect wide-band amplifier A is CGY21.This model amplifier output signal noise is low, and the signal drawn is more clear.
The size of described power supply U is 5V.
Compared with prior art, the beneficial effects of the utility model are:
1, the utility model accesses non-capacitive choke on the port 2 of two-stage field effect wide-band amplifier, form filtering net to provide little ripple direct current power, prevent the power amplification coefficient power amplification ratio when frequency raises from declining, stablizing of better guaranteed output amplification coefficient, thus make amplifier realize the stable object of amplifying small-signal, ensure the reliability of amplifier operation.
2, signal transmission is first through the low distortion operational amplifier process of low distortion and low noise with after amplifying, signal transmission can not distortion, again amplifying through the small-signal of two-stage field effect wide-band amplifier to transmission, and then export, twice amplification is carried out to signal transmission, ensures the clear and stable of signal transmission.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Be further elaborated the utility model below in conjunction with accompanying drawing, embodiment of the present utility model is not limited thereto.
Embodiment 1:
As shown in Figure 1, the utility model comprises 5V power supply U, electric capacity C1 is 220 microfarads, electric capacity C2180 pico farad, electric capacity C3 is 180 pico farads, electric capacity C4 is 1.2 microfarads, electric capacity C5 is 1.2 microfarads, electric capacity C6 is 0.1 microfarad, electric capacity C7 is 470 pico farads, electric capacity C8 is 220 pico farads, two-stage field effect wide-band amplifier A, low distortion operational amplifier A 1, resistance R1 and resistance R2 is 50 Europe, resistance R3 is 3 kilo-ohms, resistance R4 is 7.8 kilo-ohms, resistance R5 is 10 kilo-ohms, resistance R6 is 10 kilo-ohms and choke L, described power supply U connects drop-down electric capacity C1 successively, drop-down electric capacity C2 and drop-down electric capacity C3, non-capacitive choke L is also connected between the port 2 of described two-stage field effect wide-band amplifier A and power supply U, also electric capacity C4 and resistance R1 is connected successively between the port 3 and port 4 of two-stage field effect wide-band amplifier A, the output of low distortion operational amplifier A 1 also connects the port 4 of two-stage field effect wide-band amplifier A, port 4 ground connection wherein, between the port one and port 4 of two-stage field effect wide-band amplifier A, also connect electric capacity C5 and resistance R2 successively, be also connected output signal Vout at electric capacity C5 with the common port of resistance R2, described resistance R3 and resistance R4 connects successively, resistance R4 also connects the input in the same way of low distortion operational amplifier A 1, drop-down electric capacity C8 is also connected at the input in the same way of low distortion operational amplifier A 1, contact resistance R5 is gone back between input and reverse input end in the same way in low distortion operational amplifier A 1, also connect pull down resistor R6 at the reverse input end of low distortion operational amplifier A 1, input signal Vin is inputted by resistance R3, also be connected electric capacity C7 between the common port of described resistance R3 and resistance R4 and the output of low distortion operational amplifier A 1, low distortion operational amplifier A 1 also connects power supply U, power supply U connects drop-down electric capacity C6.
Input signal Vin in this circuit first through the filter action of resistance R4, R5 and drop-down electric capacity C8 direct current signal filtered out the input in the same way then passing to low distortion operational amplifier A 1 carry out amplifying process after through output export then by signal transmission between the port 3 of two-stage field effect wide-band amplifier A below and port 4, between the positive input that electric capacity C7 is wherein connected to low distortion operational amplifier A 1 and output, ensure signal transmission signal stable between positive input and output, larger fluctuation can not be produced.The reverse input end of low distortion operational amplifier A 1 arranges pull down resistor R6, between the reverse input end and output of low distortion operational amplifier A 1, resistance R5 is set, resistance R6 is made to be 1 to 2 with the ratio of resistance R5 and resistance R6 resistance sum, thus the ratio ensureing the voltage of input and output signal is 1 to 2, thus achieve the first time amplification of signal.Owing to being low distortion operational amplifier A 1, the signal of transmission is not easy the situation occurring distortion.When the signal that two-stage field effect wide-band amplifier A will transmit, the filter circuit formed through resistance R1 and electric capacity C4 carries out filtering to the flip-flop in small-signal, then be transferred to two-stage field effect wide-band amplifier A through port 3 and carry out small-signal amplification, the effect of choke L simultaneously by being connected with two-stage field effect wide-band amplifier A port 2, form filtering net to provide little ripple direct current power, stablizing of better guaranteed output amplification coefficient, thus make amplifier realize the stable object of amplifying small-signal, ensure the reliability of amplifier operation.Signal after two-stage field effect wide-band amplifier A amplifies is again through the filter action of the filter circuit of electric capacity C5 and resistance R2 composition, filtering direct current signal, AC signal after amplifying exported through output signal Vout, owing to only having used one-level amplification, the noise of output signal is lower.Power supply U in this circuit provides electric energy for two-stage field effect wide-band amplifier A and choke L.And electric capacity C1, electric capacity C2 and electric capacity C3 are all the microwaves in filter out power signal, make power supply more stable.
Signal Vin for input is first processed by low distortion operational amplifier A 1 pair of signal of low distortion, low noise, ensure the quality of signal transmission, and by feedback principle, signal message is amplified 2 times, then again secondary amplification is carried out to signal passing to two-stage field effect wide-band amplifier below, finally again signal is exported.Wherein on two-stage field effect wide-band amplifier, also connect non-capacitive choke, form filtering net to provide little ripple direct current power, stablizing of better guaranteed output amplification coefficient, thus make amplifier realize the stable object of amplifying small-signal.Small-signal exports and can be amplified effective after the process of this circuit, and the output signal clearly that the distortion factor is low, ensures the reliability of amplifier operation.
Embodiment 2:
The present embodiment is as follows at embodiment preferred concrete structure on the basis of above-described embodiment: the resistance of resistance R5 and resistance R6 is equal is 10 kilo-ohms.
The model of low distortion operational amplifier A 1 is MAX4478.This amplifier provides rail-to-rail output, and operating voltage can be low to moderate 2.7V.Every road amplifier only consumes the quiescent current of 2.2mA, and has super-low distortion, low input noise density and low input current noise density.Ensure that low distortion and the low noise of signal transmission.
The model of described two-stage field effect wide-band amplifier A is CGY21.This model amplifier output signal noise is low, and the signal drawn is more clear.
The size of described power supply U is 5V.
Just this utility model can be realized as mentioned above.
Claims (5)
1. the amplifier circuit in low noise that the distortion factor is low, it is characterized in that: comprise power supply U, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, two-stage field effect wide-band amplifier A, low distortion operational amplifier A 1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 and choke L, described power supply U and connect drop-down electric capacity C1, drop-down electric capacity C2 and drop-down electric capacity C3 successively; Non-capacitive choke L is also connected between the port 2 of described two-stage field effect wide-band amplifier A and power supply U, also electric capacity C4 and resistance R1 is connected successively between the port 3 and port 4 of two-stage field effect wide-band amplifier A, the output of low distortion operational amplifier A 1 also connects the port 4 of two-stage field effect wide-band amplifier A, port 4 ground connection wherein; Between the port one and port 4 of two-stage field effect wide-band amplifier A, also connect electric capacity C5 and resistance R2 successively, be also connected output signal Vout at electric capacity C5 with the common port of resistance R2; Described resistance R3 and resistance R4 connects successively, resistance R4 also connects the input in the same way of low distortion operational amplifier A 1, drop-down electric capacity C8 is also connected at the input in the same way of low distortion operational amplifier A 1, contact resistance R5 is gone back between input and reverse input end in the same way in low distortion operational amplifier A 1, also connect pull down resistor R6 at the reverse input end of low distortion operational amplifier A 1, input signal Vin is inputted by resistance R3; Also be connected electric capacity C7 between the common port of described resistance R3 and resistance R4 and the output of low distortion operational amplifier A 1, low distortion operational amplifier A 1 also connects power supply U, power supply U connects drop-down electric capacity C6.
2. the amplifier circuit in low noise that the distortion factor according to claim 1 is low, is characterized in that: the resistance of described resistance R5 and resistance R6 is equal is 10 kilo-ohms.
3. the amplifier circuit in low noise that the distortion factor according to claim 1 is low, is characterized in that: the model of described low distortion operational amplifier A 1 is MAX4478.
4. the amplifier circuit in low noise that the distortion factor according to claim 1 is low, is characterized in that: the model of described two-stage field effect wide-band amplifier A is CGY21.
5. the amplifier circuit in low noise that the distortion factor according to claim 1 is low, is characterized in that: the size of described power supply U is 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420600112.6U CN204156822U (en) | 2014-10-17 | 2014-10-17 | The amplifier circuit in low noise that the distortion factor is low |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420600112.6U CN204156822U (en) | 2014-10-17 | 2014-10-17 | The amplifier circuit in low noise that the distortion factor is low |
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| Publication Number | Publication Date |
|---|---|
| CN204156822U true CN204156822U (en) | 2015-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420600112.6U Expired - Fee Related CN204156822U (en) | 2014-10-17 | 2014-10-17 | The amplifier circuit in low noise that the distortion factor is low |
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| CN (1) | CN204156822U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270102A (en) * | 2014-10-17 | 2015-01-07 | 绵阳雷迪创微电子科技有限公司 | Low-distortion amplifier circuit |
| CN105929514A (en) * | 2016-05-31 | 2016-09-07 | 河南宏骏通信工程有限公司 | Tension control system for optical cable laying |
-
2014
- 2014-10-17 CN CN201420600112.6U patent/CN204156822U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270102A (en) * | 2014-10-17 | 2015-01-07 | 绵阳雷迪创微电子科技有限公司 | Low-distortion amplifier circuit |
| CN104270102B (en) * | 2014-10-17 | 2017-08-15 | 山东鸿荣电子有限公司 | low distortion amplifier circuit |
| CN105929514A (en) * | 2016-05-31 | 2016-09-07 | 河南宏骏通信工程有限公司 | Tension control system for optical cable laying |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161228 Address after: 610000 Sichuan City, Chengdu province high tech Zone, Xiaojiahe is the number of street, building 11, building 1, building 2 Patentee after: CHENGDU XIANTONG SCIENCE & TECHNOLOGY CO., LTD. Address before: 621000 Mianyang city of Sichuan Province Science Park Innovation Service Center Patentee before: MIANYANG LEIDICHUANG MICROELECTRONICS CO., LTD. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150211 Termination date: 20181017 |
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| CF01 | Termination of patent right due to non-payment of annual fee |