CN1094548A - A kind of method and device that reduces the power amplifier loudspeaker distortions - Google Patents
A kind of method and device that reduces the power amplifier loudspeaker distortions Download PDFInfo
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- CN1094548A CN1094548A CN 93110987 CN93110987A CN1094548A CN 1094548 A CN1094548 A CN 1094548A CN 93110987 CN93110987 CN 93110987 CN 93110987 A CN93110987 A CN 93110987A CN 1094548 A CN1094548 A CN 1094548A
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- circuit
- power amplifier
- signal
- earphone
- loud speaker
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Abstract
Power amplifier all has distortion to a certain degree on the transmission characteristic of self, make the effect of loud speaker undesirable.In order to remedy this defective, often use negative feedback to reduce distortion, but also reduced gain simultaneously.The present invention adopts following method and device to reduce distortion; In the sampling of loud speaker (earphone) circuit signal, the input signal of input comparison circuit and power amplifier compares, and the distorted signal of comparison circuit output feeds back to power amplifier, to reduce distortion.Circuit of the present invention is simple, can reduce distortion to a great extent, and not influence Amplifier Gain.
Description
The present invention relates to the power amplifier technical field.
Power amplifier is widely used in the telecommunications field.It removes the signal amplification of input to promote loud speaker.Yet, the same with other amplifiers, on the transmission characteristic of himself, all have to a certain degree non-linear, cause the distortion of output signal, the effect that loud speaker is produced is undesirable, and this is the defective of power amplifier self.In order to remedy this defective, adopt degenerative method usually, the signal feedback that is about to its output suppresses distortion to input, but has also reduced gain simultaneously.Gain and distortion are two aspects of contradiction, on the one hand in order to obtain enough big output signal level, need to strengthen gain, on the other hand in order to reduce distortion, but will reduce gain, and the two must not be taken into account.
CN1066942A(application number 92100868.6) a kind of " method of optimizing performance of power amplifier circuit and device thereof " disclosed, the method that it adopts is as follows: a single intermodulation product's that produces in the power amplifier course of work is separated (its amplitude equates with other intermodulation product's amplitude), itself and a reservation threshold are compared, with at least one running parameter of change, responding this comparison, thereby the performance of power amplifier electrical equipment is optimized.This technical scheme and the present invention are inequality.
The object of the present invention is to provide a kind of the employing to take out distorted signal and it is fed back to the scheme of power amplifier circuit input, to reduce the method and apparatus of power amplifier distortion.
The present invention comprises loud speaker (earphone) circuit signal sample circuit 1, comparison circuit 2, distorted signal amplifying circuit 3.Fig. 1 is its structure chart, and wherein, 4 is the elementary power amplifier of power amplifier, and 5 is power amplifier final stage power amplifier circuit, and 6 is loud speaker (earphone).Sample circuit 1 is connected in loud speaker (earphone) circuit, can take out the sampled signal of reflection loud speaker (earphone) circuit signal from it, and its amplitude equates with the range value of elementary power amplifier 4 input signals of power amplifier; The input of the elementary power amplifier 4 of positive input termination power amplifier of comparison circuit 2, negative input end accesses the output of sample circuit 1, compare producing signal on the input signal of power amplifier and loud speaker (earphone) the circuit signal sample circuit 1, thereby obtain to comprise power amplifier distortion and loud speaker (earphone) distortion at interior distorted signal; The distorted signal input signal amplifying circuit 3 that comparison circuit 2 produces amplifies, then the input of input power amplifier final stage power amplifier circuit 5.Sample circuit 1, comparison circuit 2, distorted signal amplifying circuit 3 can adopt discrete component to form, and also can adopt integrated circuit.
When undistorted signal produces in loud speaker (earphone) circuit, equate with the amplitude of the input signal of power amplifier that by the range value of the signal of obtaining on the sample circuit 1 therefore, comparison circuit 2 no signals are exported, the work of power amplifier is not exerted an influence.When in loud speaker (earphone) circuit, having distorted signal to produce, the signal that obtains in the sample circuit 1, compare with the input signal of power amplifier, in comparison circuit 2, just produce a distorted signal, the input of input power amplifier final stage power amplifier circuit 5 after distorted signal amplifying circuit 3 amplifies, 180 ° of the phasic differences mutually of the distortion that phase place and the power amplifier course of work of the distorted signal of input produced reduce so that the effect of the distortion of elimination power amplifier and loud speaker (earphone) circuit thereby play.
Advantage of the present invention is, just distortion played inhibitory action when it only produces distortion in the power amplifier course of work, and can not reduce gain, therefore, can reduce distortion to a great extent and need not the gain of step-down amplifier.Its Method and circuits is simple, is a kind of desirable scheme that reduces distortion.
The inventor has made model machine, and effect is remarkable.Fig. 2 is the embodiment circuit diagram.6 are the machine of raising one's voice; R
OSample resistance for sample circuit; Power amplifier is three grades of push-pull power amplifiers, and elementary power amplifier is that inverting amplifier adopts NE5532 integrated circuit, the BG in the secondary power amplifier
1Adopt the 2N5551 triode, BG
2Adopt the 2N5401 triode, the BG in the final stage power amplifier circuit
3Adopt the 2N3055 triode, BG
4Adopt the MJ2955 triode; Comparison circuit adopts the NE5532 integrated circuit; Distorted signal amplifying circuit 3 is made of the two poles of the earth, and the first order is for adopting the see-saw circuit of NE5532 integrated circuit.The second level is triode amplifier BG
5, adopt 2N5551, BG
6Adopt 2N5401, distorted signal is imported BG respectively after amplifying
3And BG
4Base stage.
Claims (4)
1, the method for a kind of minimizing power amplifier, loud speaker (earphone) distortion is characterized in that comprising following steps:
Take out the sampled signal of reflection loud speaker (earphone) circuit signal in loud speaker (earphone) circuit signal sample circuit, its range value equals the amplitude of power amplifier input signal;
The input signal of sampled signal and power amplifier is compared, thereby obtain distorted signal;
Distorted signal is amplified;
Input with the final stage power amplifier circuit of the distorted signal input power amplifier after amplifying forms negative feedback, to reduce the distortion of power amplifier, loud speaker (earphone).
2, a kind of device that reduces power amplifier, loud speaker (earphone) distortion is characterized in that comprising loud speaker (earphone) circuit signal sample circuit 1, comparison circuit 2, distorted signal amplifying circuit 3; Sample circuit 1 is connected in loud speaker (earphone) circuit, takes out the sampled signal of reflection loud speaker (earphone) circuit signal from it; The input of the elementary power amplifier 4 of positive input termination power amplifier of comparison circuit 2, negative input end accesses the output of sample circuit 1; The distorted signal of comparison circuit 2 output after distorted signal amplifying circuit 3 amplifies, the input of input power amplifier final stage power amplifier circuit 5.
3,, it is characterized in that wherein loud speaker (earphone) circuit signal sample circuit 1, comparison circuit 2, distorted signal amplifying circuit 3 adopt discrete component according to the described device that reduces power amplifier, loud speaker (earphone) distortion of claim 2.
4,, it is characterized in that wherein loud speaker (earphone) circuit signal sample circuit 1, comparison circuit 2, distorted signal amplifying circuit 3 adopt integrated circuit according to the described device that reduces power amplifier, loud speaker (earphone) distortion of claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93110987 CN1094548A (en) | 1993-04-24 | 1993-04-24 | A kind of method and device that reduces the power amplifier loudspeaker distortions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93110987 CN1094548A (en) | 1993-04-24 | 1993-04-24 | A kind of method and device that reduces the power amplifier loudspeaker distortions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1094548A true CN1094548A (en) | 1994-11-02 |
Family
ID=4988799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93110987 Pending CN1094548A (en) | 1993-04-24 | 1993-04-24 | A kind of method and device that reduces the power amplifier loudspeaker distortions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1094548A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101233683B (en) * | 2005-06-29 | 2011-04-13 | 诺基亚西门子网络公司 | Data processing method, transmitter, device, network element and base station |
-
1993
- 1993-04-24 CN CN 93110987 patent/CN1094548A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101233683B (en) * | 2005-06-29 | 2011-04-13 | 诺基亚西门子网络公司 | Data processing method, transmitter, device, network element and base station |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |