CN201557082U - Front circuit connected with digital amplifier - Google Patents
Front circuit connected with digital amplifier Download PDFInfo
- Publication number
- CN201557082U CN201557082U CN2009202023356U CN200920202335U CN201557082U CN 201557082 U CN201557082 U CN 201557082U CN 2009202023356 U CN2009202023356 U CN 2009202023356U CN 200920202335 U CN200920202335 U CN 200920202335U CN 201557082 U CN201557082 U CN 201557082U
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- CN
- China
- Prior art keywords
- operational amplifier
- resistance
- amplifier
- phase input
- input end
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Abstract
The utility model relates to a front circuit connected with a digital amplifier, which is formed by connecting two operational amplifiers, eight resistors and four capacitors. The front circuit connected with a digital amplifier can achieve the effect of an original circuit by adopting two common operational amplifiers to replace a fully differential operational amplifier. As the common operational amplifiers have low cost, the front circuit connected with a digital amplifier has comparatively low cost.
Description
Technical field:
The utility model relates to a kind of front end circuit that is used for the connection digital power amplifier of power amplifier sound console.
Background technology:
In the prior art, the front end circuit of the connection digital power amplifier in the general band power amplifier sound console is made up of a full differential amplifier and accessory circuit thereof, the homophase output of described full differential amplifier is connected with digital power amplifier with anti-phase output, its concrete connecting circuit is by five resistance, three electric capacity and a full differential amplifier connect to form, the one termination sound console signal output of described first resistance, the in-phase input end of another termination full differential amplifier, one end ground connection of described second resistance, the inverting input of another termination full differential amplifier, described the 3rd resistance is in parallel with first electric capacity, the in-phase input end of its common port one termination full differential amplifier, the inverting input of another termination full differential amplifier, described the 4th resistance is in parallel with second electric capacity, the in-phase input end of its common port one termination full differential amplifier, the reversed-phase output of another termination full differential amplifier, described the 5th resistance is in parallel with the 3rd electric capacity, the inverting input of its common port one termination full differential amplifier, the in-phase output end of another termination full differential amplifier.Though adopt the front end circuit circuit of connection digital power amplifier of this structure comparatively simple, very high to the performance requirement of full differential amplifier, the cost of full differential amplifier is higher, causes the cost of entire circuit higher.
The utility model content:
The technical problems to be solved in the utility model is, overcomes existing technological deficiency, and a kind of front end circuit of lower-cost connection digital power amplifier is provided.
Technical solution of the present utility model is, a kind of front end circuit that connects digital power amplifier is provided, it is by two operational amplifiers, eight resistance, four electric capacity connect to form, the signal output of one termination sound console of described first resistance, one end of another termination first electric capacity, connect the in-phase input end of first operational amplifier behind another termination second resistance of first electric capacity, the common port of described the 3rd resistance one termination, first resistance and first electric capacity, other end ground connection, one end ground connection of described second electric capacity, the in-phase input end of another termination first operational amplifier, the inverting input of described first operational amplifier is connected with output, described the 4th resistance one termination power, the in-phase input end of another termination second operational amplifier, the in-phase input end of described the 5th resistance one termination second operational amplifier, other end ground connection, the in-phase input end of described the 3rd electric capacity one termination second operational amplifier, other end ground connection, the in-phase input end of described the 6th resistance one termination first operational amplifier, the in-phase input end of another termination second operational amplifier, the in-phase input end of described the 7th resistance one termination first operational amplifier, the other end and the output that connects second operational amplifier after the 8th resistance is connected, the inverting input of described the 4th electric capacity one termination second operational amplifier, the output of another termination second operational amplifier, the output of the output of described first operational amplifier and second operational amplifier is connected with digital power amplifier.
After adopting said structure, the utlity model has following advantage:
Adopt two common operational amplifiers to replace full differential operational amplifier, can play the effect that original circuit reaches, the cost of common operational amplifier is very low, so the cost of the front end circuit of the utility model connection digital power amplifier is also lower.
Description of drawings:
Accompanying drawing 1 is the circuit theory diagrams that connect the front end circuit of digital power amplifier in the prior art;
Accompanying drawing 2 is circuit theory diagrams that the utility model connects the front end circuit of digital power amplifier.
Embodiment:
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Be illustrated in figure 1 as the circuit theory diagrams that connect the front end circuit of digital power amplifier in the prior art, it is by five resistance, three electric capacity and a full differential amplifier connect to form, the one termination sound console signal output of described first resistance R 1, the in-phase input end of another termination full differential amplifier U1, one end ground connection of described second resistance R 2, the inverting input of another termination full differential amplifier U1, described the 3rd resistance R 3 is in parallel with first capacitor C 1, the in-phase input end of its common port one termination full differential amplifier U1, the inverting input of another termination full differential amplifier U1, described the 4th resistance R 4 is in parallel with second capacitor C 2, the in-phase input end of its common port one termination full differential amplifier U1, the reversed-phase output of another termination full differential amplifier U1, described the 5th resistance R 5 is in parallel with the 3rd electric capacity R3, the inverting input of its common port one termination full differential amplifier U1, the in-phase output end of another termination full differential amplifier U1.Adopting the model of full differential amplifier in this circuit is OPA1632.The cost of this chip is higher.
Be illustrated in figure 2 as the circuit theory diagrams that the utility model connects the front end circuit of digital power amplifier, it is by two operational amplifiers, eight resistance, four electric capacity connect to form, the signal output of one termination sound console of described first resistance R 1, one end of another termination first capacitor C 1, connect the in-phase input end of the first operational amplifier U2A after another termination second resistance R 2 of first capacitor C 1, the common port of described the 3rd resistance R 3 one terminations, first resistance R 1 and first capacitor C 1, other end ground connection, one end ground connection of described second capacitor C 2, the in-phase input end of another termination first operational amplifier U2A, the inverting input of the described first operational amplifier U2A is connected with output, described the 4th resistance R 4 one termination powers, the in-phase input end of another termination second operational amplifier U2B, the in-phase input end of described the 5th resistance R 5 one terminations second operational amplifier U2B, other end ground connection, the in-phase input end of described the 3rd capacitor C 2 one terminations second operational amplifier U2B, other end ground connection, the in-phase input end of described the 6th resistance R 6 one terminations first operational amplifier U2A, the in-phase input end of another termination second operational amplifier U2B, the in-phase input end of described the 7th resistance R 7 one terminations first operational amplifier U2A, the other end and the output that meets the second operational amplifier U2B after the 8th resistance R 8 is connected, the inverting input of described the 4th capacitor C 4 one terminations second operational amplifier U2B, the output of another termination second operational amplifier U2B, the output of the output of the described first operational amplifier U2A and the second operational amplifier U2B is connected with digital power amplifier.Two operational amplifiers of Cai Yonging are two operational amplifiers that integrate in this example, and its model is NE5532.
Operation principle of the present utility model is: audio signal enters in the circuit inversion signal and amplifies the back by first operational amplifier and be connected with digital power amplifier, in-phase signal is connected with digital power amplifier after entering and amplifying in second operational amplifier, the circuit that is connected with second operational amplifier with first operational amplifier is the accessory circuit of operational amplifier, level Signal Matching before and after plaing a part in the front end circuit of whole connection digital power amplifier.
Claims (1)
1. front end circuit that connects digital power amplifier, it is characterized in that: it is by two operational amplifiers, eight resistance, four electric capacity connect to form, the signal output of one termination sound console of described first resistance R 1, one end of another termination first capacitor C 1, connect the in-phase input end of the first operational amplifier U2A after another termination second resistance R 2 of first capacitor C 1, the common port of described the 3rd resistance R 3 one terminations, first resistance R 1 and first capacitor C 1, other end ground connection, one end ground connection of described second capacitor C 2, the in-phase input end of another termination first operational amplifier U2A, the inverting input of the described first operational amplifier U2A is connected with output, described the 4th resistance R 4 one termination powers, the in-phase input end of another termination second operational amplifier U2B, the in-phase input end of described the 5th resistance R 5 one terminations second operational amplifier U2B, other end ground connection, the in-phase input end of described the 3rd capacitor C 2 one terminations second operational amplifier U2B, other end ground connection, the in-phase input end of described the 6th resistance R 6 one terminations first operational amplifier U2A, the in-phase input end of another termination second operational amplifier U2B, the in-phase input end of described the 7th resistance R 7 one terminations first operational amplifier U2A, the other end and the output that meets the second operational amplifier U2B after the 8th resistance R 8 is connected, the inverting input of described the 4th capacitor C 4 one terminations second operational amplifier U2B, the output of another termination second operational amplifier U2B, the output of the output of the described first operational amplifier U2A and the second operational amplifier U2B is connected with digital power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202023356U CN201557082U (en) | 2009-12-11 | 2009-12-11 | Front circuit connected with digital amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202023356U CN201557082U (en) | 2009-12-11 | 2009-12-11 | Front circuit connected with digital amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201557082U true CN201557082U (en) | 2010-08-18 |
Family
ID=42616771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202023356U Expired - Fee Related CN201557082U (en) | 2009-12-11 | 2009-12-11 | Front circuit connected with digital amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201557082U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105635466A (en) * | 2015-12-30 | 2016-06-01 | 惠州Tcl移动通信有限公司 | Mobile communication terminal and audio circuit thereof |
| CN114089249A (en) * | 2021-11-26 | 2022-02-25 | 广东美的暖通设备有限公司 | Filter circuit, eddy current sensor, debugging method and debugging device |
-
2009
- 2009-12-11 CN CN2009202023356U patent/CN201557082U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105635466A (en) * | 2015-12-30 | 2016-06-01 | 惠州Tcl移动通信有限公司 | Mobile communication terminal and audio circuit thereof |
| CN105635466B (en) * | 2015-12-30 | 2019-12-13 | 惠州Tcl移动通信有限公司 | Mobile communication terminal and audio circuit thereof |
| CN114089249A (en) * | 2021-11-26 | 2022-02-25 | 广东美的暖通设备有限公司 | Filter circuit, eddy current sensor, debugging method and debugging device |
| CN114089249B (en) * | 2021-11-26 | 2024-05-28 | 广东美的暖通设备有限公司 | Filter circuit, eddy current sensor, debugging method and debugging device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Ningbo Qifa Electronics Co.,Ltd. Assignor: Dong Lingjuan Contract record no.: 2010330002274 Denomination of utility model: Front circuit connected with digital amplifier Granted publication date: 20100818 License type: Exclusive License Record date: 20101224 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100818 Termination date: 20151211 |
|
| EXPY | Termination of patent right or utility model |