CN103840645A - Filter circuit for power supply noise sensitive device - Google Patents
Filter circuit for power supply noise sensitive device Download PDFInfo
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- CN103840645A CN103840645A CN201210489087.4A CN201210489087A CN103840645A CN 103840645 A CN103840645 A CN 103840645A CN 201210489087 A CN201210489087 A CN 201210489087A CN 103840645 A CN103840645 A CN 103840645A
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- triode
- capacitor
- power supply
- filter circuit
- supply noise
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Abstract
The invention provides a filter circuit for a power supply noise sensitive device. A signal input end is grounded through a capacitor C2 and a polar capacitor C1 which are connected in parallel; a signal output end is grounded through a capacitor C3 and a polar capacitor C4 which are connected in parallel; the signal input end is connected with the collector electrode of a triode Q1 and one end of a resistor R1; the other end of the resistor R1 is connected with the negative electrode of a voltage-regulator tube D1 and the base electrode of the triode Q1; the positive electrode of the voltage-regulator tube D1 is grounded; the base electrode of the triode Q1 is grounded through a capacitor C5; and the emitting electrode of the triode Q1 is connected with the signal output end. The filter circuit is capable of reducing noise interference of a power supply effectively.
Description
Technical field
The present invention relates to power supply noise reduction technology field, particularly a kind of filter circuit of power supply noise Sensitive Apparatus.
Background technology
General circuit supply port is the effect that decoupling capacitor in parallel reaches filtering, and this situation can not be used for the circuit part to noise-sensitive, because the power supply noise that shunt capacitance reduces is limited.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of filter circuit of power supply noise Sensitive Apparatus, can effectively reduce the noise jamming of this road power supply.
To achieve these goals, the technical solution used in the present invention is:
A kind of filter circuit of power supply noise Sensitive Apparatus, signal input part is by capacitor C in parallel 2 and polar capacitor C1 ground connection, signal output part is by capacitor C in parallel 3 and polar capacitor C4 ground connection, signal input part connects the collector electrode of triode Q1 and one end of resistance R 1, the negative electrode of another termination voltage-stabiliser tube D1 of resistance R 1 and the base stage of triode Q1, the plus earth of voltage-stabiliser tube D1, the base stage of triode Q1 is by capacitor C 5 ground connection, and the emitter of triode Q1 connects signal fan-out.
Because prior art is without elements such as Q1, the fluctuation of VIN directly causes the fluctuation of VOUT, and the present invention can effectively reduce the noise jamming of this road power supply.
Brief description of the drawings
Accompanying drawing is structural representation of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is carried out to more detailed explanation.
As shown in the figure, the present invention is a kind of filter circuit of power supply noise Sensitive Apparatus, signal input part is by capacitor C in parallel 2 and polar capacitor C1 ground connection, signal output part is by capacitor C in parallel 3 and polar capacitor C4 ground connection, signal input part connects the collector electrode of triode Q1 and one end of resistance R 1, the negative electrode of another termination voltage-stabiliser tube D1 of resistance R 1 and the base stage of triode Q1, the plus earth of voltage-stabiliser tube D1, the base stage of triode Q1 is by capacitor C 5 ground connection, and the emitter of triode Q1 connects signal fan-out.
Input voltage VIN of the present invention through C1 after the filtering of C2, more stable, when VIN exists, the voltage stabilizing value V1 of D1 acts on the ground level of Q1, and VOUT does not now have voltage, Q1 conducting like this, VOUT=V1-0.7V, through the filtering of C3 and C4, the noise of VOUT reaches requirement.
In the time that VIN fluctuates, C1 C2 can absorb a part, due to the existence of D1, voltage V1 noise on it is stable, C5 is used for reducing random interference etc., the situation of the stable output of VOUT when finally reaching VIN fluctuation.
Circuit of the present invention is made up of diode, triode, resistance, electric capacity completely, when input Vin when fluctuation, Vout be constant and noise very little, can be applicable to the device to power supply noise sensitivity.
Claims (1)
1. the filter circuit of a power supply noise Sensitive Apparatus, signal input part is by capacitor C in parallel 2 and polar capacitor C1 ground connection, signal output part is by capacitor C in parallel 3 and polar capacitor C4 ground connection, it is characterized in that, signal input part connects the collector electrode of triode Q1 and one end of resistance R 1, the negative electrode of another termination voltage-stabiliser tube D1 of resistance R 1 and the base stage of triode Q1, the plus earth of voltage-stabiliser tube D1, the base stage of triode Q1 is by capacitor C 5 ground connection, and the emitter of triode Q1 connects signal fan-out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210489087.4A CN103840645A (en) | 2012-11-26 | 2012-11-26 | Filter circuit for power supply noise sensitive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210489087.4A CN103840645A (en) | 2012-11-26 | 2012-11-26 | Filter circuit for power supply noise sensitive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103840645A true CN103840645A (en) | 2014-06-04 |
Family
ID=50803867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210489087.4A Pending CN103840645A (en) | 2012-11-26 | 2012-11-26 | Filter circuit for power supply noise sensitive device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103840645A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306636A (en) * | 2015-10-30 | 2016-02-03 | 努比亚技术有限公司 | Method, circuit and system for improving power supply noise |
| CN107608442A (en) * | 2017-09-29 | 2018-01-19 | 深圳怡化电脑股份有限公司 | A kind of accurate voltage-stabilizing circuit |
| CN114356012A (en) * | 2021-12-31 | 2022-04-15 | 龙迅半导体（合肥）股份有限公司 | Circuit |
-
2012
- 2012-11-26 CN CN201210489087.4A patent/CN103840645A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105306636A (en) * | 2015-10-30 | 2016-02-03 | 努比亚技术有限公司 | Method, circuit and system for improving power supply noise |
| CN105306636B (en) * | 2015-10-30 | 2020-09-29 | 南京鼎臻自动化科技有限公司 | Method, circuit and system for improving power supply noise |
| CN107608442A (en) * | 2017-09-29 | 2018-01-19 | 深圳怡化电脑股份有限公司 | A kind of accurate voltage-stabilizing circuit |
| CN114356012A (en) * | 2021-12-31 | 2022-04-15 | 龙迅半导体（合肥）股份有限公司 | Circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140604 |