Digital self-calibration chopper precision amplifier and implementation method

An amplifier, self-calibration technology, applied in the direction of amplifier, differential amplifier, amplifier type, etc., can solve the problem of high cost

Pending Publication Date: 2017-10-10
LINEARIN TECH CORP
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  • Abstract
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AI Technical Summary

Problems solved by technology

Ping-pong auto-zero technology requires multiple main amplifiers and auxiliary amplifiers, and the cost will be higher

Method used

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  • Digital self-calibration chopper precision amplifier and implementation method

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Embodiment Construction

[0019] figure 1 is one specific circuit implementation of the digital self-calibrating chopper precision amplifier of the present invention, although other configurations are possible. The digital self-calibrating chopper precision amplifier 100 includes a pair of input differential pairs 111, two pairs of differential current sources 112 and 113, an amplified output circuit 120, a chopper modulation (modulate) switch circuit 131 in the chopper circuit and a chopper demodulator ( demodulate) switch circuits 132 and 133, a comparison output circuit 140, a bisection successive approximation register logic (SAR logic) circuit 150 predetermined to be N bits, and an N-digit digital-to-analog converter (Calibration DAC) circuit for calibrating amplifier mismatch 160. The amplified output circuit 120 includes gain boost fully differential amplifiers A1 and A2 and a fully differentially driven Class AB (Class AB) output amplifier.

[0020] The class AB output amplifier with full dif...

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Abstract

The invention provides a high-performance digital self-calibration chopper precision amplifier which is low in cost and easy to implement and an implementation method. The amplifier mainly comprises a digital self-calibration loop and a chopper circuit. After the amplifier is energized, the amplifier is configured as a digital self-calibration state within a period of time, and the chopper circuit and an amplifier output circuit are switched off. The calibrated digital quantity is stored in a register, and input offset voltage of the amplifier is calibrated through a digital analog converter. After the digital self-calibration state is finished, a comparison output circuit is switched off, the amplifier is configured as a chopper magnifying state, and the chopper circuit and the amplifier output circuit work, so that the input offset voltage of the amplifier, temperature drift of the offset voltage and flicker noise are lowered.

Description

technical field [0001] The present invention relates to the field of amplifiers in analog integrated circuits, and more particularly relates to a technique for improving the precision of the amplifier. Background technique [0002] In the current industrial control system, instrumentation, medical equipment, security, automobile, aerospace and consumer electronics and other fields, precision amplifier integrated circuits have a wide range of applications. Input offset voltage, temperature drift (drift) of offset voltage, and flicker noise (1 / f noise) are important technical indicators indicating the accuracy of the amplifier, and their performance directly affects the accuracy indicators of the above-mentioned application equipment and systems. [0003] In the process of manufacturing integrated circuits using semiconductor processes, many factors will affect the accuracy of amplifiers, such as device mismatch, flicker noise, temperature drift of device parameters, and packa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F1/30H03F3/45
CPCH03F1/26H03F1/301H03F3/45179H03F2200/372H03F2200/271H03F2200/15H03F2203/45354
Inventor 王绍栋余晓舰
Owner LINEARIN TECH CORP
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