Amplifier circuit

An amplifier circuit and amplifier technology, applied in the direction of amplifiers, power amplifiers, and improved amplifiers to reduce the impact of noise, can solve problems such as signal distortion, insufficient loop gain, and poor performance in high-frequency areas, and achieve the goal of improving the output power supply rejection ratio Effect
CN103546103AActive Publication Date: 2014-01-29MEDIATEK INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MEDIATEK INC
Publication Date
2014-01-29

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Abstract

An amplifier circuit is disclosed. The amplifier circuit is used for receiving a first supply power source and a second supply power source. The amplifier circuit includes a detection circuit, a control amplifier circuit and an output stage. The detection circuit detects disturbances occurring in a first supply voltage and provides detection results. The control amplifier circuit controls a first voltage provided to a first control node and a second voltage provided to a second control node in response to the detection results. The output stage circuit includes a first output power transistor coupled to the control amplifier circuit at the first control node and a second output power transistor coupled to the control amplifier circuit at the second control node. The first voltage and the second voltage are controlled differently when a disturbance is detected to have occurred.
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Description

technical field

[0001] The present invention relates to an amplifier circuit design, in particular to an amplifier circuit design that strengthens the power supply rejection ratio at the output stage. Background technique

[0002] Amplifiers are generally used in a variety of applications, including audio signal processing, video signal processing, communication systems, control systems, satellite systems, etc. In the low power amplifier design, the Total Harmonic Distortion (THD) of the amplifier usually performs poorly in the high frequency region due to insufficient loop gain. In particular, when the output stage of a low power amplifier is disturbed by power supply noise, the noise generated by the power supply will eventually exist in the output signal, resulting in signal distortion.

[0003] Therefore, various amplifier circuit designs that enhance the Power Supply Rejection Ratio (PSRR) at the output stage are required. Contents of the invention

[0004] In view ...

Claims

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