Low-offset high-precision static comparator

Abstract

The invention relates to a low-offset high-precision static comparator, and belongs to the technical field of integrated circuits. The comparator comprises: a bias circuit, which is used for controlling a bias current source and adjusting a resistance value, i.e., an output value of a reference current; the first-stage amplifier, the second-stage amplifier and the third-stage amplifier are used for amplifying input signals step by step; the latch circuit is used for latching an input signal and outputting the input signal to the latch output stage; the latch output stage is used for receivingthe signal of the latch circuit, amplifying the latch signal to full swing, and enhancing the driving capability of the output signal; and the digital control logic is used for receiving the signal ofthe latch output stage and controlling the controllable current source after level judgment so as to calibrate the offset of the comparator. By adopting the low-offset high-precision static comparator provided by the invention, the offset voltage of the comparator can be reduced, the precision of the comparator is improved, and the power consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, in particular to a static comparator with low offset and high precision. Background technique [0002] Comparing two or more data items to determine whether they are equal, or to determine the size relationship and arrangement order between them is called comparison. A circuit or device capable of performing this comparison function is called a comparator. A comparator is a circuit that compares an analog voltage signal to a reference voltage. The two inputs of the comparator are analog signals, and the output is a binary signal 0 or 1. When the difference between the input voltages increases or decreases and the positive and negative signs remain unchanged, the output remains constant. [0003] Comparators are important circuits for converting analog signals into digital signals, and are widely used in circuits such as sensors, analog-to-digital converters, and high-speed interface...

AI Technical Summary

Problems solved by technology

The offset voltage of the above technical solution does not adopt a special calibration method, which will prevent the increase of large series and naturally reduce the equivalent input offset of the latch

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