Offset voltage correction circuit, integrated circuit, system and method

Abstract

The invention provides an offset voltage correction circuit, an integrated circuit, a system and a method, and the circuit comprises: a current generation circuit which is used for generating an input current at least comprising an offset current; an offset voltage storage circuit which is used for storing an offset voltage corresponding to the offset current and outputting a first current according to the first offset voltage; an offset voltage pre-correction circuit which is used for generating correction current according to the first current and correcting the input current through the correction current; and a voltage output circuit which is used for outputting voltage corresponding to the corrected current. Therefore, the offset voltage correction circuit can directly output the corrected voltage, and the time that the offset voltage exists in the circuit is short, so that the influence on the performance of an instrument amplifier is reduced, and the dynamic range of an output signal processed by the instrument amplifier is improved.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an offset voltage correction circuit, integrated circuit, system and method. Background technique [0002] At present, the signals processed in the signal acquisition system are generally tiny analog signals, such as the output signals of bioelectrical signals, pressure sensors, and temperature sensors. However, most modern signal processing systems can quickly process digital signals, so the above-mentioned tiny analog signals need to be After the signal is amplified, the analog-to-digital conversion is performed, and then the converted digital signal is sent to the controller for processing. [0003] Instrumentation amplifiers are critical circuits that are often used for tiny analog signal processing. But when the small analog signal input to the instrumentation amplifier contains drift voltage, the instrumentation amplifier will amplify the signal, which will reduce the dy...

AI Technical Summary

Problems solved by technology

But when the small analog signal input to the instrumentation amplifier contains drift voltage, the instrumentation amplifier will amplify the signal, which will reduce the dynamic range of the instrumentation amplifier output, and even make the instrumentation amplifier not work properly.

Images