Composite comparator

Abstract

The invention discloses a composite comparator, which is used for comparing a single-path input signal with multi-path fixed reference voltage. The composite comparator comprises a resistive voltage division module, a bias circuit module and a multi-input differential composite comparator module, wherein the resistive voltage division module is connected with a reference voltage signal Vref, and divides the reference voltage signal Vref into a group of reference voltages Vrefi to form n+1 voltage range sub-domain intervals, i=1, 2, ..., n, and n is a natural number; the bias circuit module is connected with a power end Vcc, and provides bias power for the multi-input differential composite comparator module; and the multi-input differential composite comparator module is connected with the single-path input signal Vin, the reference voltage signal Vref and the bias circuit module respectively, and outputs n comparison results to determine a voltage range sub-domain interval with the single-path input signal Vin. The size of a chip design is reduced, and the power consumption of the composite comparator is only 2I regardless of the distribution and size of a range with the input signal.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a multi-input composite comparator. Background technique [0002] In integrated circuit design, especially in the sampling and quantization process of the analog-to-digital converter, it is necessary to determine the sub-domain interval of the voltage range where the analog input sampling signal is located. Usually, a simple and commonly used method is to compare the analog input signal with multiple fixed reference voltages, and when the state of the comparator array changes, the subfield interval of the voltage range of the input signal can be obtained. [0003] figure 1 (a) shows a typical circuit schematic for comparing a single input signal with multiple fixed reference voltages. Vref is a reference voltage not related to power supply and temperature. The reference voltage Vref is divided into N reference voltages arranged in ascending order through N+1 resisto...

AI Technical Summary

Problems solved by technology

This makes it necessary to face the problem of chip size and power consumption design composed of multiple comparators when comparing a single input signal with multiple fixed reference voltages.

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