Comparator and analog-to-digital converter

Abstract

The invention provides a comparator and an analog-to-digital converter, the comparator comprises an input unit, a load unit, a control switch and an adjusting unit, the input end of the input unit receives a first input signal and a second input signal, and the load unit is connected with the input unit; the gain of the comparator is adjusted by adjusting the gain of the load unit to adjust the gate voltage of the geminate transistor, and the adjusting unit is connected with the input unit and adjusts the gain to adjust the gate voltage of the geminate transistor according to the enabling state of the control switch; the invention further provides an analog-to-digital converter, the gain of the comparator is small in an offset elimination state, so that the offset voltage amplification factor of the comparator is small, the gain of the comparator is large in a signal amplification state, the input differential mode signal amplification factor of the comparator is large, and the influence of the offset voltage of the comparator on the comparison result of the comparator is eliminated. The comparator speed is improved, the layout area is reduced, and the offset voltage of the comparator is obviously eliminated.

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. 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 analog-to-digital converters has been greatly improved. Improve, at the same time, power consumption is 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 same time. [0003] In the case of low precision req...

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