Power amplifier module

A technology for power amplifiers and single-ended amplifiers, applied in amplifiers, amplifier combinations, differential amplifiers, etc., can solve the problems of unsuitable for asymmetrical input, insufficient stability, inaccurate quiescent current control, etc., to achieve accurate quiescent current control, The effect of quiescent current control enhancement
CN1575541AInactive Publication Date: 2005-02-02NXP BV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NXP BV
Publication Date
2005-02-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a power amplifier module comprising single-ended amplifiers (101 and 102) which are arranged in a BTL configuration. The single-ended amplifiers (101 and 102) have low-impedance inverting inputs coupled by a resistor R1 for improved stability and quiescent current control.
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Description

technical field

[0001] The present invention relates to a power amplifier module, in particular to an audio power amplifier. Background technique

[0002] The prior art shows many power amplifiers that can be used for audio amplification. Specifically, US Patent No. 5,216,381 shows a unity-gain final stage, especially for a monolithically-integrable power amplifier using an AB-driver type N-channel MOS transistor as a power supply device. The power amplifier includes a high-gain feedback differential amplifier, the inverting input of which is connected to the input of the power amplifier. This prior art amplifier has some important drawbacks: inaccurate quiescent current control and insufficient stability.

[0003] figure 1 A corresponding unity-gain final stage comprising a pair of terminal N-channel MOS power transistors 1 and 2 is shown. The first transistor 1 has its drain connection connected to a supply voltage 3 and its source connection is connected to the drain ...

Claims

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