CN204156820U - Amplifier circuit in low noise - Google Patents
Amplifier circuit in low noise Download PDFInfo
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- CN204156820U CN204156820U CN201420600057.0U CN201420600057U CN204156820U CN 204156820 U CN204156820 U CN 204156820U CN 201420600057 U CN201420600057 U CN 201420600057U CN 204156820 U CN204156820 U CN 204156820U
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Abstract
The utility model discloses amplifier circuit in low noise, comprise power supply U, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, two-stage field effect wide-band amplifier A, resistance R1, resistance R2, signal source 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; Also connect choke L 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, resistance R1 and signal source successively, 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.The utility model is by foregoing circuit, even if when signal source frequency raises, power amplification coefficient power amplification ratio also can not decline, and ensures the amplification realized preferably signal source small-signal, and the signal that output noise is low.
Description
Technical field
The utility model relates to amplifier region, is specifically related to amplifier circuit in low noise.
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, and the situation that power amplification coefficient power amplification ratio declines fast, affects amplifier magnification ratio, and in addition, existing low noise amplifier exists the larger defect of noise in output signal.
Utility model content
The utility model overcomes the deficiencies in the prior art, there is provided amplifier circuit in low noise, even if this circuit is when signal source frequency raises, power amplification coefficient power amplification ratio also can not decline, ensure the amplification realized preferably signal source small-signal, and the signal that output noise is low.
For solving above-mentioned technical problem, the utility model is by the following technical solutions: amplifier circuit in low noise, comprise power supply U, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, two-stage field effect wide-band amplifier A, resistance R1, resistance R2, signal source 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; Also connect choke L 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, resistance R1 and signal source successively, 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.This circuit adopts two-stage field effect wide-band amplifier, and frequency range, at 40-1000MHz, can be used in the Circuits System of antenna, measurement and teleconverter 50 Europe and 75 Europe impedances.This circuit declines to prevent the power amplification coefficient power amplification ratio when frequency raises, and also connects choke at port 2 place of two-stage field effect wide-band amplifier A, makes the stable amplification ensureing to realize preferably signal source small-signal, and ensures to export low noise signal.
Described choke L is non-capacitive choke L.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.
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.
Described resistance R1 is equal with resistance R2 resistance, is 50 and beats up.
Described electric capacity C2 is equal with electric capacity C3 capacitance.
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, this circuit structure is simple, and the model of two-stage field effect wide-band amplifier A is CGY21, and this model amplifier output signal noise is low, and the signal drawn is more clear.
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 C2 is 180 pico farads, electric capacity C3 is 180 pico farads, electric capacity C4 is 1.2 microfarads, electric capacity C5 is 1.2 microfarads, two-stage field effect wide-band amplifier A, resistance R1 are 50 Europe, resistance R2 is 50 Europe, signal source and choke L, and described power supply U connects drop-down electric capacity C1, drop-down electric capacity C2 and drop-down electric capacity C3 successively; Also connect choke L 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, resistance R1 and signal source successively, 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.
Signal source in this circuit provides faint signal to two-stage field effect wide-band amplifier A, 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.
This circuit adopts two-stage field effect wide-band amplifier, and frequency range, at 40-1000MHz, can be used in the Circuits System of antenna, measurement and teleconverter 50 Europe and 75 Europe impedances.This circuit declines to prevent the power amplification coefficient power amplification ratio when frequency raises, and also connects choke at port 2 place of two-stage field effect wide-band amplifier A, makes the stable amplification ensureing to realize preferably signal source small-signal, and ensures to export low noise signal.
Embodiment 2:
The present embodiment is as follows at embodiment preferred concrete structure on the basis of above-described embodiment: choke L is non-capacitive choke L.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.
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.
Described resistance R1 is equal with resistance R2 resistance, is 50 and beats up.
Described electric capacity C2 is equal with electric capacity C3 capacitance.
Just this utility model can be realized as mentioned above.
Claims (6)
1. amplifier circuit in low noise, it is characterized in that: comprise power supply U, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, two-stage field effect wide-band amplifier A, resistance R1, resistance R2, signal source 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; Also connect choke L 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, resistance R1 and signal source successively, 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.
2. amplifier circuit in low noise according to claim 1, is characterized in that: described choke L is non-capacitive choke L.
3. amplifier circuit in low noise according to claim 1, is characterized in that: the model of described two-stage field effect wide-band amplifier A is CGY21.
4. amplifier circuit in low noise according to claim 1, is characterized in that: the size of described power supply U is 5V.
5. amplifier circuit in low noise according to claim 1, is characterized in that: described resistance R1 is equal with resistance R2 resistance, is 50 and beats up.
6. amplifier circuit in low noise according to claim 1, is characterized in that: described electric capacity C2 is equal with electric capacity C3 capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420600057.0U CN204156820U (en) | 2014-10-17 | 2014-10-17 | Amplifier circuit in low noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420600057.0U CN204156820U (en) | 2014-10-17 | 2014-10-17 | Amplifier circuit in low noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204156820U true CN204156820U (en) | 2015-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420600057.0U Expired - Fee Related CN204156820U (en) | 2014-10-17 | 2014-10-17 | Amplifier circuit in low noise |
Country Status (1)
| Country | Link |
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| CN (1) | CN204156820U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300918A (en) * | 2014-10-17 | 2015-01-21 | 绵阳雷迪创微电子科技有限公司 | Low-noise amplifier circuit |
-
2014
- 2014-10-17 CN CN201420600057.0U patent/CN204156820U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300918A (en) * | 2014-10-17 | 2015-01-21 | 绵阳雷迪创微电子科技有限公司 | Low-noise amplifier circuit |
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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: 20170103 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. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150211 Termination date: 20181017 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |