CN201294487Y - Low noise DC servo circuit - Google Patents
Low noise DC servo circuit Download PDFInfo
- Publication number
- CN201294487Y CN201294487Y CNU2008201389534U CN200820138953U CN201294487Y CN 201294487 Y CN201294487 Y CN 201294487Y CN U2008201389534 U CNU2008201389534 U CN U2008201389534U CN 200820138953 U CN200820138953 U CN 200820138953U CN 201294487 Y CN201294487 Y CN 201294487Y
- Authority
- CN
- China
- Prior art keywords
- amplifier
- amplifying circuit
- links
- circuit
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model relates to a low noise direct current servo circuit which can neglect noise which is fed into a main amplifier under the condition that the circuit is within the range which sufficiently realizes the direct current servo, the circuit is characterized in that an integral amplifier is formed through mutually linking an integrated operational amplifier (IC) and an amplifying circuit (A) with high voltage endurance and voltage gain, wherein the integrated operational amplifier (IC) forms an input stage, the output end of the integrated operational amplifier (IC) is linked with the input end of the amplifying circuit (A) with high voltage endurance and voltage gain, the power of the integrated operational amplifier (IC) is supplied by low-voltage power supplies (+Vcc1) and (-Vcc1), the power of the amplifying circuit (A) with high voltage endurance and voltage gain is supplied by high-voltage power supplies (+Vcc2) and (-Vcc2). The output amplitude value of the low noise direct current servo circuit can be very high, the voltage dividing ratio fed into the main amplifying circuit can be very big, although the noise output by the low noise direct current servo circuit is not reduced, since the voltage dividing ratio is increased, the noise fed in the main amplifier is reduced.
Description
Technical field
The utility model relates to the monophony in the transistor audio frequency amplifier in the sound equipment field or preamplifier (or claiming control amplifier), power amplifier, Earphone Amplifier, merging amplifier or the AV amplifier technology of multichannel.
Background technology
Present transistor audio frequency amplifier is because the existence that transistor zero wafts needs to adopt the DC servo circuit to waft to eliminate zero of transistor audio frequency amplifier.Usually use integrating circuit to make the DC servo circuit, because require cut-off frequency very low, so the filter resistance of integrating circuit is very big, this just must use the amplifier of field effect transistor input, and the equivalent input noise height of the amplifier of general field effect transistor input, though integrating circuit has 100% interchange negative feedback, output has the amplitude and the bandwidth of equivalent input noise at least, though during DC servo circuit feed-in main amplifier voltage ratio is arranged, the noise of feed-in main amplifier also be can not ignore.
Summary of the invention
In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of under the condition that enough DC servo scopes are arranged, the negligible low noise DC servo of the noise of feed-in main amplifier circuit.
The purpose of this utility model is to realize by such technical scheme: resistance R 1 one ends are the output that input connects main amplifier, the negative input end of resistance R 1 other end and integral amplifier links, the negative input end of capacitor C 1 one ends and integral amplifier links, the output of capacitor C 1 other end and integral amplifier links, the positive input terminal and the earth potential of integral amplifier link, and constitute anti-phase type DC servo circuit; Perhaps, resistance R 1 one ends are the output that input connects main amplifier, the positive input terminal of resistance R 1 other end and integral amplifier links, the positive input terminal of capacitor C 1 one ends and integral amplifier links, capacitor C 1 other end and earth potential link, resistance R 2 one ends and earth potential link, the negative input end of resistance R 2 other ends and integral amplifier links, the negative input end of capacitor C 2 one ends and integral amplifier links, the output of capacitor C 2 other ends and integral amplifier links, constitute positive facies pattern DC servo circuit, a kind of low noise DC servo circuit, be characterized in: integral amplifier is linked by integrated operational amplifier IC and high withstand voltage amplifying circuit A with voltage gain and constitutes, integrated operational amplifier IC constitutes input stage, integrated operational amplifier IC output links with high withstand voltage amplifying circuit A input with voltage gain, integrated operational amplifier IC is by LVPS+Vcc1,-Vcc1 power supply, height is withstand voltage to have the amplifying circuit A of voltage gain by high-voltage power supply+Vcc2,-Vcc2 power supply.
High withstand voltage amplifying circuit A with voltage gain can be: (1) positive amplifier; (2) inverting amplifier.
High withstand voltage amplifying circuit A with voltage gain can be: (1) one-stage amplifier; (2) casacade multi-amplifier.
High withstand voltage amplifying circuit A with voltage gain can be: (1) discrete component constitutes; (2) integrated circuit.
The utility model is because there is high withstand voltage amplifying circuit A with voltage gain, the output amplitude of low noise DC servo circuit can be very high, voltage ratio during the feed-in main amplifier just can be very big, though the noise of low noise DC servo circuit output does not reduce, because voltage ratio increases, so the noise of feed-in main amplifier reduces.
Description of drawings
Fig. 1 is the principle schematic of the low noise DC servo circuit of high withstand voltage amplifying circuit A with voltage gain anti-phase type that is inverting amplifier.Because high withstand voltage amplifying circuit A with voltage gain is an inverting amplifier,, constitute the low noise DC servo circuit of anti-phase type so the positive input terminal of resistance R 1 other end and integrated operational amplifier IC links.
Fig. 2 is the principle schematic of the low noise DC servo circuit of high withstand voltage amplifying circuit A with voltage gain anti-phase type that is the positive amplifier.Because high withstand voltage amplifying circuit A with voltage gain is the positive amplifier,, constitute the low noise DC servo circuit of anti-phase type so the negative input end of resistance R 1 other end and integrated operational amplifier IC links.
Fig. 3 is the principle schematic of the low noise DC servo circuit of high withstand voltage amplifying circuit A with voltage gain positive facies pattern that is inverting amplifier.Because high withstand voltage amplifying circuit A with voltage gain is an inverting amplifier,, constitute the low noise DC servo circuit of positive facies pattern so the negative input end of resistance R 1 other end and integrated operational amplifier IC links.
Fig. 4 be the high withstand voltage amplifying circuit A positive facies pattern that is the positive amplifier with voltage gain low noise DC servo circuit principle schematic.Because high withstand voltage amplifying circuit A with voltage gain is the positive amplifier,, constitute the low noise DC servo circuit of positive facies pattern so the positive input terminal of resistance R 1 other end and integrated operational amplifier IC links.
Fig. 5 is that high withstand voltage amplifying circuit A with voltage gain is inverting amplifier and the principle schematic of the low noise DC servo circuit of the anti-phase type of one-stage amplifier that be the discrete component formation.
Fig. 6 is that high withstand voltage amplifying circuit A with voltage gain is the positive amplifier and the principle schematic of the low noise DC servo circuit of the positive facies pattern of two-stage amplifier that be the discrete component formation.
Embodiment
Embodiment 1: high withstand voltage amplifying circuit A with voltage gain as shown in Figure 5 is inverting amplifier and the low noise DC servo circuit of the anti-phase type of one-stage amplifier that be the discrete component formation.Transistor Q1, Q2, resistance R 3, R4, R5, R6, voltage-stabiliser tube D1, D2 constitute common-base amplification circuit; Transistor Q3, Q4, resistance R 7, R8 constitute the common emitter amplifying circuit, and transistor Q5, Q6 constitute common collector amplifying circuit, and voltage-stabiliser tube D1, D2 are used for improving gain, constitute the high withstand voltage amplifying circuit A with voltage gain of the single-stage amplification of discrete component; Integrated operational amplifier IC output links with high withstand voltage amplifying circuit A input with voltage gain, integrated operational amplifier IC by LVPS+Vcc1 ,-Vcc1 power supply, high withstand voltage amplifying circuit A with voltage gain by high-voltage power supply+Vcc2 ,-the Vcc2 power supply; Resistance R 1 one ends are input, because high withstand voltage amplifying circuit A with voltage gain is an inverting amplifier, so the positive input terminal of resistance R 1 other end and integrated operational amplifier IC links, the positive input terminal of capacitor C 1 one ends and integrated operational amplifier IC links, capacitor C 1 other end links with high withstand voltage output with amplifying circuit A of voltage gain, negative input end and the earth potential of integrated operational amplifier IC link, and constitute the low noise DC servo circuit of anti-phase type.
Embodiment 2: high withstand voltage amplifying circuit A with voltage gain as shown in Figure 6 is the positive amplifier and the low noise DC servo circuit of the positive facies pattern of two-stage amplifier that be the discrete component formation.Transistor Q1, Q2, resistance R 3, R4, voltage-stabiliser tube D1 constitutes the common emitter amplifying circuit; Transistor Q3, Q4, resistance R 5, R6 constitute the common emitter amplifying circuit, and transistor Q5, Q6 constitute common collector amplifying circuit, and voltage-stabiliser tube D1 is used for improving gain, constitutes the high withstand voltage amplifying circuit A with voltage gain of the secondary amplification of discrete component; Integrated operational amplifier IC output links with high withstand voltage amplifying circuit A input with voltage gain, integrated operational amplifier IC by LVPS+Vcc1 ,-Vcc1 power supply, high withstand voltage amplifying circuit A with voltage gain by high-voltage power supply+Vcc2 ,-the Vcc2 power supply; Resistance R 1 one ends are input, the negative input end of resistance R 1 other end and integrated operational amplifier IC links, the negative input end of capacitor C 1 one ends and integrated operational amplifier IC links, capacitor C 1 other end links with high withstand voltage output with amplifying circuit A of voltage gain, the positive input terminal and the earth potential of amplifier link, and constitute the low noise DC servo circuit of anti-phase type.
The output of low noise DC servo circuit can connect low pass filter, has further reduced the noise of feed-in main amplifier.
The output of low noise DC servo circuit can connect buffer or amplifying circuit.
Claims (4)
1. low noise DC servo circuit, resistance (R1) end is the output that input connects main amplifier, the negative input end of resistance (R1) other end and integral amplifier links, the negative input end of electric capacity (C1) end and integral amplifier links, the output of electric capacity (C1) other end and integral amplifier links, the positive input terminal and the earth potential of integral amplifier link, and constitute anti-phase type DC servo circuit; Perhaps, resistance (R1) end is the output that input connects main amplifier, the positive input terminal of resistance (R1) other end and integral amplifier links, the positive input terminal of electric capacity (C1) end and integral amplifier links, electric capacity (C1) other end and earth potential link, resistance (R2) end and earth potential link, the negative input end of resistance (R2) other end and integral amplifier links, the negative input end of electric capacity (C2) end and integral amplifier links, the output of electric capacity (C2) other end and integral amplifier links, constitute positive facies pattern DC servo circuit, it is characterized in that: integral amplifier is by integrated operational amplifier (IC) and high withstand voltage amplifying circuit (A) with voltage gain formation that links, integrated operational amplifier (IC) constitutes input stage, integrated operational amplifier (IC) output links with high withstand voltage amplifying circuit (A) input with voltage gain, integrated operational amplifier (IC) by LVPS (+Vcc1), (-Vcc1) power supply, high withstand voltage amplifying circuit (A) with voltage gain by high-voltage power supply (+Vcc2), the power supply of (-Vcc2).
2. low noise DC servo circuit according to claim 1 is characterized in that, high withstand voltage amplifying circuit (A) with voltage gain can be made of one of column circuits down: 1. positive amplifier; 2. inverting amplifier.
3. low noise DC servo circuit according to claim 1 is characterized in that, high withstand voltage amplifying circuit (A) with voltage gain can be made of one of column circuits down: 1. one-stage amplifier; 2. casacade multi-amplifier.
4. low noise DC servo circuit according to claim 1 is characterized in that, high withstand voltage amplifying circuit (A) with voltage gain can be made of one of following column circuits: 1. discrete component constitutes; 2. integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201389534U CN201294487Y (en) | 2008-10-12 | 2008-10-12 | Low noise DC servo circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201389534U CN201294487Y (en) | 2008-10-12 | 2008-10-12 | Low noise DC servo circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201294487Y true CN201294487Y (en) | 2009-08-19 |
Family
ID=41007967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201389534U Expired - Fee Related CN201294487Y (en) | 2008-10-12 | 2008-10-12 | Low noise DC servo circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201294487Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102835026A (en) * | 2010-03-30 | 2012-12-19 | ams有限公司 | Amplifier circuit, detector arrangement and method for operating an amplifier |
| CN110677133A (en) * | 2019-09-11 | 2020-01-10 | 北京爱尔微科技有限公司 | Integral type self-adaptive baseline restoration circuit |
| CN114360469A (en) * | 2022-03-18 | 2022-04-15 | 深圳通锐微电子技术有限公司 | Driving amplifying circuit, method, chip, driving device and display equipment |
-
2008
- 2008-10-12 CN CNU2008201389534U patent/CN201294487Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102835026A (en) * | 2010-03-30 | 2012-12-19 | ams有限公司 | Amplifier circuit, detector arrangement and method for operating an amplifier |
| CN102835026B (en) * | 2010-03-30 | 2015-09-09 | ams有限公司 | Amplifier circuit, detector means and the method for driving amplifier |
| CN110677133A (en) * | 2019-09-11 | 2020-01-10 | 北京爱尔微科技有限公司 | Integral type self-adaptive baseline restoration circuit |
| CN110677133B (en) * | 2019-09-11 | 2023-03-28 | 北京爱尔微科技有限公司 | Integral type self-adaptive baseline restoration circuit |
| CN114360469A (en) * | 2022-03-18 | 2022-04-15 | 深圳通锐微电子技术有限公司 | Driving amplifying circuit, method, chip, driving device and display equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106896856A (en) | Amplifying circuit and voltage regulator | |
| CN101764580A (en) | Systems and methods for an adaptive bias circuit for a differential power amplifier | |
| CN103219952B (en) | A kind of wideband low noise amplifier adopting noise cancellation technique | |
| CN109982205B (en) | Low-power amplifier dynamic bias circuit | |
| CN104617905B (en) | Radio frequency amplifier and radio frequency amplification method | |
| CN102195569B (en) | Systems and methods for positive and negative feedback of cascode transistors for a power amplifier | |
| CN103441741A (en) | Operational amplifying circuit structure reducing offset voltage based on band-gap reference | |
| CN201294487Y (en) | Low noise DC servo circuit | |
| CN106301242A (en) | Current multiplexing type radio-frequency amplifier circuit | |
| CN102118668B (en) | Loudspeaker system and loudspeaker driving circuit | |
| CN111193477B (en) | Composite amplifier | |
| CN206164477U (en) | Current reuse type high frequency amplifier circuit | |
| CN203775149U (en) | Class-D power amplification chip with power limiting function and audio play device | |
| CN206743199U (en) | A kind of high power audio-frequency power amplifier | |
| CN105207633A (en) | Power amplifier | |
| CN104539247A (en) | Wideband amplifier circuit of Darlington structure | |
| CN100542019C (en) | The output-stage circuit of operational amplifier | |
| CN209201020U (en) | A kind of integrated operational amplifier circuit for audio player | |
| CN103475322A (en) | Output amplifier | |
| CN104506151A (en) | An operational amplifier for medical electronics | |
| CN204697017U (en) | A kind of intercom audio amplifier circuit | |
| CN202772846U (en) | Audio amplifier circuit with stable gain | |
| CN106788291A (en) | High-power amplifier integrated circuit | |
| CN202772842U (en) | Audio frequency amplifying circuit capable of restraining noise | |
| CN103475323A (en) | Power amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20101012 |