An Offset Voltage Reduction Method and Data Converter Based on Error Feedback

Abstract

The invention proposes an error feedback-based offset voltage reduction method and a data converter. The method includes the steps of receiving an input signal, receiving an output signal, comparing a first difference between the input signal and the output signal, determining a feedback signal, and adjusting parameters of the feedback circuit based on the feedback signal. The method is applied in a circuit comprising an operational amplifier, and the circuit comprises an N-bit probability register; the N-bit probability register can store N probability values, and the probability value is determined based on an output value or a feedback value; based on the N The bit probability register stores a plurality of probability values ​​for determining the feedback signal. The present invention also proposes a data converter including a comparator, the comparator reduces the offset voltage at the input of the operational amplifier based on the state of the probability value stored in the N-bit probability register by receiving the output signal of the operational amplifier .

Description

A method for reducing offset voltage based on error feedback and data converter technical field The invention belongs to the technical field of integrated arithmetic circuits, and in particular relates to a kind of offset voltage reduction based on error feedback methods and data converters. Background technique Integrated operational circuit is a precision operational circuit used to amplify weak signals, and the model and peripheral components of integrated operational amplifiers The size of the parameter is directly related to the operation precision and stability of the operation circuit. Working on Integrated Operational Amplifier Application Circuits When designing, for the sake of simplicity, the integrated op amp is often regarded as an ideal op amp. But the actual op amp is not ideal, there are offsets, temperature drift error, and closed-loop gain error. That is, when there is no signal input at the input terminal, the output terminal still outputs a non...

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Problems solved by technology

[0007] However, although the existing technology considers the use of error feedback to control the offset voltage at the input terminal, it does not consider that the accumulation of errors will lead to further expansion of the offset voltage; in addition, in the process of multiple comparator outputs or multiple analog-to-digital converter outputs, only The feedback signal can only be generated when an error occurs, resulting in a lag in the control of the offset voltage, resulting in a longer cycle of the voltage, which is not conducive to the fast and accurate output of the comparator or fuzzy converter

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