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Series feedback balance high-fidelity audio amplifying circuit

An audio amplifier circuit, series feedback technology, applied in negative feedback circuit layout, differential amplifier, DC-coupled DC amplifier, etc., can solve the problems of unstable output and low input impedance, and achieve stable circuit balance and common mode rejection ratio. High and wide frequency response

Inactive Publication Date: 2015-07-01
王文平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current known balanced amplifier circuit is the feedback method of directly applying the differential circuit, and the loop feedback resistor is connected to the output terminal of the inverting side of the amplifier circuit from the two input terminals respectively, which is parallel feedback, not only the input impedance is low, but also The feedback of the circuit is negative feedback only when each side is output separately. When the output is balanced, the output signal of the original side and the input terminal are in phase. feedback, resulting in unstable output

Method used

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  • Series feedback balance high-fidelity audio amplifying circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] figure 1 , series feedback balanced high-fidelity audio amplifier circuit, all components are symmetrically connected with different polarities up and down, and symmetrically connected with the same polarity left and right. The sources of the four field effect input tubes QA1, QB1, QA2, and QB2 are respectively connected to the square resistor network RA2 , RB2, RA3, RB3, RA4, RB4, RA5, RB5, RA6, RB6, R7, R8 four corners, two loop feedback resistors RA9, RB9 are respectively connected to the square resistor network RA2, RB2, RA3, RB3, RA4, Midpoints A and B on one side of RB4, RA5, RB5, RA6, RB6, R7, and R8, that is, the midpoints A and B of the source resistance network of two upper and lower symmetrical field effect input transistors with opposite polarities on one side, and the other ends respectively Connect the middle points C and D of the output terminals on the same side of the amplifier circuit to form a fully symmetrical series negative feedback balance circuit...

Embodiment 2

[0017] figure 2 , series feedback balanced high-fidelity audio amplifier circuit, all components are symmetrically connected with different polarities up and down, and symmetrically connected with the same polarity left and right. The sources of the four field effect input tubes QA1, QB1, QA2, and QB2 are respectively connected to the square resistor network RA2 , RB2, RA3, RB3, R4, R5, RA6, RB6 four corners, one end of two loop feedback resistors RA9, RB9 respectively connected to one side of the square resistor network RA2, RB2, RA3, RB3, R4, R5, RA6, RB6 The midpoints A and B, that is, the midpoints A and B of the source resistance network of two upper and lower symmetrical field effect input transistors with opposite polarities on one side, and the other ends are respectively connected to the midpoints C and D of the output terminals on the same side of the amplifying circuit, forming a complete left and right Symmetrical series negative feedback balance circuit structure...

Embodiment 3

[0021] image 3 , series feedback balanced high-fidelity audio amplifier circuit, all components are symmetrically connected with different polarities up and down, symmetrically connected with the same polarity left and right, and the emitters of four bipolar triode input tubes QA1, QB1, QA2, QB2 are respectively connected to the square Four corners of resistor nets RA2, RB2, RA3, RB3, RA4, RB4, RA5, RB5, RA6, RB6, R7, R8, two loop feedback resistors RA9, RB9 are connected to square resistor nets RA2, RB2, RA3, RB3 respectively , RA4, RB4, RA5, RB5, RA6, RB6, R7, R8 side midpoints A, B, that is, two upper and lower opposite polarity symmetrical bipolar triode input tube emitter resistance network midpoint A, B, the other end is respectively connected to the middle points C and D of the output end of the same side of the amplifier circuit, forming a fully symmetrical series negative feedback balance circuit structure.

[0022] As a further preferred embodiment, the center poin...

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Abstract

The invention discloses a series feedback balance high-fidelity audio amplifying circuit. All elements are in balanced connection in an up-down hetero-polar symmetry and left-right homo-polar symmetry; in-phase output poles of four input tubes are connected to four corners of a square resistance network respectively; certain ends of two loop feedback resistors are connected with a middle point of a side edge of the square resistance network respectively, namely the middle point of the resistance of the in-phase output poles of the two input tubes in the up-down hetero-polar symmetry, and the other ends are connected with a middle point of an output end on a same side of an amplifying circuit respectively to constitute the series negative feedback balance circuit structure in complete bilateral symmetry.

Description

technical field [0001] The invention relates to an audio amplifier circuit, in particular to a series feedback balanced high-fidelity audio amplifier circuit. Background technique [0002] The current known balanced amplifier circuit is the feedback method of directly applying the differential circuit, and the loop feedback resistor is connected to the output terminal of the inverting side of the amplifier circuit from the two input terminals respectively, which is parallel feedback, not only the input impedance is low, but also the The feedback of the circuit is negative feedback only when each side is output separately. When the output is balanced, the output signal of the original side and the input terminal are in phase. feedback, resulting in unstable output. Contents of the invention [0003] The invention provides a high-quality serial feedback balanced high-fidelity audio amplifier circuit. [0004] The technical scheme used by the present invention to solve the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/34
Inventor 王文平
Owner 王文平
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