Positive feedback isolating dynamic latch comparator

Abstract

The invention discloses a positive feedback isolating dynamic latch comparator. The comparer comprises a cross coupling input unit, an input reset unit, a CMOS isolating switch unit, a cross coupling latch structure unit, a latch reset unit, an output shaping unit and a positive feedback unit. The cross coupling input unit converts an input voltage signal into a current. The cross coupling latch structure unit and the latch reset unit finish comparison functions. The CMOS isolating switch unit isolates the cross coupling input unit and the cross coupling latch structure unit at a reset stage, thereby reducing the influence of kickback noises. The input reset unit resets the output end of the cross coupling input unit at the reset stage. The positive feedback unit is controlled by the output of the output shaping unit and amplifies the current at a comparison stage. CLK and NCLK are two non-overlap clocks and provide a time sequence for the whole dynamic latch comparator. According to the comparer, the speed and precision of the dynamic latch comparator can be remarkably improved, and the power consumption is reduced.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a positive feedback isolation dynamic latch comparator applied to an analog-to-digital converter. Background technique [0002] With the rapid development of semiconductor technology, electronic components based on digital circuits are increasingly integrated into all aspects of people's lives, and the analog-to-digital converter (ADC), as a bridge connecting analog signals and digital signals, is particularly important in the entire system. [0003] The comparator is the core module of the ADC, and its accuracy, speed, power consumption, offset and other indicators have an important impact on the performance of the entire ADC, and even affect the performance of the entire system. The conventional pre-amplified dynamic latch comparator has higher speed and lower power consumption compared with the static comparator, but its precision is lower. Conventional dynamic latchi...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of low speed, high power consumption, low precision and poor performance of existing dynamic latch comparators, and proposes a positive feedback isolation dynamic latch comparator

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