Amplifier offset cancellation using amplifier supply voltage

A power supply voltage, amplifier technology, applied in the field of eliminating amplifier offset, can solve problems such as amplifier offset, aggravate offset, etc., to achieve the effect of eliminating shortcomings and problems

Active Publication Date: 2019-12-31
CIRRUS LOGIC INT SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a mismatch between such resistors can cause an offset in the amplifier, which is applied to the signal to be amplified, and this offset can also be amplified by the amplifier itself, further exacerbating the presence of the offset

Method used

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  • Amplifier offset cancellation using amplifier supply voltage
  • Amplifier offset cancellation using amplifier supply voltage
  • Amplifier offset cancellation using amplifier supply voltage

Examples

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Embodiment Construction

[0018] According to an embodiment of the present disclosure, an integrated circuit used in an audio device (such as a personal audio device, e.g., a mobile phone, a portable music player, a tablet computer, a personal digital assistant, etc.) may include signal paths having digital Path sections (eg, audio compressors) and analog path sections (eg, audio expanders). The analog path section may include a TCFC amplifier for receiving the analog signal generated by the digital path section and applying gain to the analog signal to generate an output signal that may be routed to speakers for playback and / or to other circuit for processing.

[0019] The integrated circuits described above may be used in any suitable system, device or apparatus, including but not limited to personal audio equipment. figure 1 is a diagram of an example personal audio device 1 according to an embodiment of the present disclosure. figure 1 Personal audio device 1 is depicted coupled to headphones 3 i...

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PUM

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Abstract

In accordance with embodiments of the present disclosure, a method for power supply rejection for an amplifier may include generating a correction signal by multiplying a quantity indicative of a power supply voltage of the amplifier by a transfer function defining a response from the power supply voltage of the amplifier to an output signal of the amplifier and subtracting the correction signal from a signal within a signal path of a circuit comprising the amplifier.

Description

technical field [0001] The present disclosure relates generally to circuits for audio devices, including but not limited to personal audio devices such as wireless phones and media players, and more particularly to canceling amplifier offset by applying transfer functions to amplifier supply voltages. Background technique [0002] Personal audio devices including wireless phones (such as mobile / cellular phones, cordless phones, mp3 players) and other consumer audio devices are in widespread use. Such personal audio equipment may include circuitry for driving a pair of headphones or one or more speakers. Such circuitry typically includes a power amplifier to drive the audio output signal to headphones or speakers. Typically, such power amplifiers are implemented using impedance (eg, resistors), among other circuit elements (eg, operational amplifiers, etc.), to set the gain of the power amplifier. However, a mismatch between such resistors can cause an offset in the amplifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/187H03F3/213H03F1/02H03F3/45H03F1/30
CPCH03F1/0227H03F1/025H03F1/30H03F3/187H03F3/213H03F3/45475H03F2200/03H03F2200/375H03F2200/511H03F2203/45528H03F2203/45588H03F2203/45594H03F2203/45596H03F2203/45601H03F3/45973H03F3/45982H03F2203/45042H03F2203/45152H03F2203/45681G05F1/565H03F1/3223H03F1/3264H03F3/183H03F3/45H03F3/45744H03F3/45968H03F1/0233H03F2203/45022H03F2203/45212
Inventor 格雷姆·G·麦凯朱磊何苦瓦希克里希那·帕鲁帕里
Owner CIRRUS LOGIC INT SEMICON
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