Trimming circuit for operational amplifier circuit

Abstract

The invention relates to a trimming circuit for an operational amplifier circuit. The trimming circuit is composed of a first variable resistor, a first current source, an input terminal 1, an output terminal 1, a first limiting resistor, a second variable resistor, a second current source, an input terminal 2, an output terminal 2, a second limiting resistor, a constant current source and a power supply. The operational amplifier has the advantages that the circuit has a flexible input offset voltage range, bidirectional trimming is set, and bidirectional flexible correction of operational amplifier input precision can be achieved. Therefore, the operational amplifier circuit can be flexibly used in actual use, and the use requirements of various occasions can be met through a trimming technology on a wafer, namely a test, of the circuit according to actual requirements.

Description

technical field [0001] The invention relates to a trimming circuit for an operational amplifier circuit. Background technique [0002] Operational amplifiers are one of the indispensable modules in large-scale integrated circuits. Operational amplifiers can be used in various integration circuits, digital-to-analog conversion circuits, differential circuits, analog-to-digital conversion circuits, etc. However, there are many types of models, and the specific requirements for use are different; at the same time, in the actual production of a qualitative operational amplifier circuit, due to the processing deviation caused by etching, injection, film formation, cleaning and other processes in the production process, it will As a result, different areas on the same wafer, the input offset voltage of the operational amplifier circuit, and the actual deviation of the output accuracy parameters are very large. [0003] Therefore, it is necessary to design a trimming circuit that...

AI Technical Summary

Problems solved by technology

However, there are many types of models, and the specific requirements for use are different; at the same time, in the actual production of a qualitative operational amplifier circuit, due to the processing deviation caused by etching, injection, film formation, cleaning and other processes in the production process, it will Cause different areas on the same wafer, the input offset voltage of the operational amplifier circuit, and the actual deviation of the output accuracy parameters is very large

[0003] Therefore, it is necessary to design a trimming circuit that can meet all requirements through wafer-level testing and avoid the parameter dispersion brought about by production, so as to reduce the trouble that customers cannot choose when using it.

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