Low-offset full-motion comparator

Abstract

The invention discloses a low-offset full-motion comparator. Influences of offset voltage on a comparator are substantially reduced by adding a preamplifier circuit and an offset eliminating circuit to compensate the offset voltage at an input end of the comparator. Compared with conventional comparators with preamplifier circuits, the low-offset full-motion comparator has the advantages that a preamplifier of a full-motion structure is adopted without consuming static current so that power consumption is lowered.

Description

technical field [0001] The invention relates to a low offset full dynamic comparator and belongs to the field of comparators. Background technique [0002] For analog circuits such as digital-to-analog converters and analog-to-digital converters, comparators are very important circuit modules, and their offset characteristics and power consumption will significantly affect the performance and working status of the overall circuit. According to the working principle, the comparators commonly used in successive approximation analog-to-digital converters and flash analog-to-digital converters can be roughly divided into two categories: operational amplifier comparators and Latch comparators. The op amp structure comparator can distinguish smaller input signals, but at a slower speed; the Latch comparator is faster, but can only distinguish larger input signals. In high-speed and high-precision applications, there are high requirements on the accuracy and speed of the comparato...

AI Technical Summary

Problems solved by technology

But the offset voltage of the traditional Latch comparator will also affect the normal operation of the comparator

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