Comparator based on pre-amplification stage structure and analog-to-digital converter

Abstract

The invention is applicable to the technical field of integrated circuits, and provides a comparator and an analog-to-digital converter based on a pre-amplification stage structure, and the comparator comprises a first pre-amplification stage, the input end of which is connected with a differential input signal, amplifies and outputs the differential input signal, and outputs a first differential output signal; the input end of the second pre-amplification stage is connected with the first differential output signal, the first differential output signal is amplified and output, a second differential output signal is output, a positive feedback unit is arranged between the output end and the input end of the second pre-amplification stage, and the voltage gain of the second pre-amplification stage is improved through the positive feedback unit; the input end of the latch is connected with a second differential output signal; the voltage gain of the second pre-amplification stage is improved through the positive feedback unit, especially the voltage gain of a small signal is improved, and thus the equivalent input noise of the comparator can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a comparator and an analog-to-digital converter based on a pre-amplification stage structure. Background technique [0002] In recent years, with the continuous development of integrated circuit manufacturing technology, the feature size of CMOS devices has been continuously reduced, and the operating voltage of integrated circuits has also been continuously reduced. Under the deep submicron process, the working speed of the analog-to-digital converter has been greatly improved, and at the same time, the power consumption has been further reduced. However, as the core component of the analog-to-digital converter, the performance of the comparator has become a bottleneck in the design of high-speed and low-power consumption. Several traditional comparator structures are difficult to meet the requirements of speed, power consumption and low power supply voltage at the ...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a comparator and an analog-to-digital converter based on a pre-amplification stage structure to solve the problem of high noise in the comparator in the prior art

Images