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Transistor series connection single end direct coupled class-a power amplification circuit

A power amplifier circuit and transistor technology, applied in power amplifiers, improving amplifiers to reduce nonlinear distortion, etc., can solve the problems of under-excitation of the circuit, excessive fluctuation of the potential at the output terminal, and the circuit cannot work normally.

Inactive Publication Date: 2008-01-30
李希强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] 5. In order to finally realize the direct coupling of the output load, it is necessary to completely solve the problem of zero drift that cannot be determined due to excessive potential fluctuations at the output end of the original circuit
[0029] 6. The original "common source-common drain" circuit can only amplify small signals. If the original mode is copied, the circuit will be under-excited and eventually the circuit will not work properly.

Method used

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  • Transistor series connection single end direct coupled class-a power amplification circuit
  • Transistor series connection single end direct coupled class-a power amplification circuit
  • Transistor series connection single end direct coupled class-a power amplification circuit

Examples

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Comparison scheme
Effect test

Embodiment 1

[0071] Fig. 4B is the simplest form of the circuit of the present invention: a practical circuit diagram of transistors "common source-common drain" connected in series with a single-ended direct-coupled Class A power amplifier circuit. It is formed by adding a first-stage source output driver on the basis of the schematic diagram in Figure 4A. In Figure 4B, as the pre-source follower Q 1 in a small-signal “common-drain” configuration, so Q 1 produces less distortion when a sinusoidal signal is passed by C 1 Front-end input via Q 1 Source output, then added to the lower output tube Q 2 The signal on the gate can still be considered as a sinusoidal signal, and the circuit flow and analysis method are shown in Figure 4A.

[0072] By the following parameters:

[0073] C 1 : 1µF C 2 : 30MF C 3 : 3.3µF

[0074] R G1 : 330K R G2: 560KR S1 : 200ΩR S2 : 2.2ΩR S3 : 0.91Ω

[0075] Q 1 : 2SK213Q 2 : 2SC15A / 200V Q 3 : 20N20

[0076] +V DD : +24.2V-V DD : -24.2V V G +...

Embodiment 2

[0085] Fig. 5B is the second form of expression of the present invention: a practical circuit diagram of transistors "common drain-common gate-common drain" connected in series with single-ended direct coupling Class A power amplifier circuit, which is the basis of the schematic diagram in Fig. 5A It is formed by adding a stage of front-end source output driver. As in Figure 4B, as the source of the front, the follower Q 1 in the small-signal “common-drain” configuration, therefore, Q 1 Produces less distortion. When a sinusoidal signal by C 1 Front-end input, through Q 1 source output, then added to the source follower Q 2 The signal on the gate can still be regarded as a sinusoidal signal, and the flow and analysis method of the circuit afterwards are shown in Figure 5A.

[0086] By the following parameters:

[0087] C 1 : 1µF C 2 : 30MF C 3 : 3.3µF

[0088] R G1 : 160KR G2 : 750K R S1 : 56ΩR S2 : 1.5ΩR S3 : 0.47Ω

[0089] Q 1 : 2SJ76Q 2 : 2SA15A / 200V Q 3 ...

Embodiment 3

[0100] Fig. 6B is the third expression form of the present invention: a practical circuit diagram of transistors "common source-common gate-common drain" connected in series with a single-ended direct-coupled Class A power amplifier circuit. It is formed by adding a pre-stage source output driver on the basis of Figure 6A, and the source follower Q 1 The function of the circuit is shown in Figure 5B, and the flow and analysis method of the circuit is shown in Figure 6A. In the power supply system of the circuit, because |+V DD |=|-V ss |-|V G+ |, while the auxiliary power supply V in this embodiment G+ The value is +24V, which can no longer be ignored, so this example adopts the high-voltage power supply and output transformer coupling output mode with the style of vacuum tube power amplifier, but this output transformer is different from the previous vacuum tube output transformer, it is a DC magnetic flux-free Single-ended output transformer, because the circuit in this ...

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Abstract

The invention relates to an A-class single-ended straight coupling power amplifier with transistors connected in series which has three different manifestations: 'common source-common leakage', 'common leakage-common gate-common leakage', 'common source-common gates-common leakage'. The circuit achieves the coexistence of the even harmonics and the single ended straight coupling rich in the output signal and has the advantages of low noise, high gains, good step response, and high output efficiency, and is an effective method to improve the sound quality of the transistor power and simplify the vacuum tubes.

Description

[0001] Field [0002] The invention relates to a class A power amplifier circuit with transistors connected in series and single-ended direct coupling. The power amplifier circuit can have three forms: transistor "common source-common drain", "common drain-common gate-common drain" " and "common source - common gate - common drain" are connected in series with a single-ended direct-coupled Class A power amplifier circuit. Background technique [0003] In recent years, vacuum tube power amplifiers have made a comeback, and they have established a strong trend in the high-end market of main power amplifiers. Although the vacuum tube power amplifier drags a stupid, big, black, thick, infinitely lazy body, and has caused a huge devour of energy and resources, its clear and mellow sound like the sound of nature is fascinating, let us The aftertaste is meaningful. [0004] The classic, vacuum tube direct-heating triode single-tube Class A amplifier, which is talked about in the au...

Claims

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Application Information

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IPC IPC(8): H03F3/21H03F1/32
Inventor 李希强
Owner 李希强