A comparator delay correction circuit and method in adc and adc

Abstract

A comparer delay correction circuit in an ADC. A logic circuit (310) connected to a latch (320) is provided in a data register (300); the logic circuit (310) controls the latch (320) such that same can output a pre-set level signal within an initial pre-set duration of a current ADC clock period; and after the pre-set duration, an output of the latch (320) depends on an output of a comparer (200). Thus, at an initial stage of each ADC clock period, the latch (320) of a corresponding bit can be forced to output and input a level signal with the same signal, namely, it is guaranteed that a hypothetical pre-set level signal is output by the latch (320) of the corresponding bit, without being affected by an output delay of the comparer (200) in the last clock period, also namely, the conversion of the next-bit of the ADC being not affected by an output delay of a comparison result of the last bit, thereby guaranteeing a normal operation of the ADC.

Description

technical field [0001] The present application relates to the technical field of analog-to-digital converters, and more specifically relates to an ADC (Analog-to-Digital Converter, analog-to-digital converter) comparator delay correction circuit, method and ADC. Background technique [0002] ADCs are widely used in industrial control, medical equipment, and microprocessor-assisted analog-to-digital conversion interfaces to convert analog signals into digital signals. [0003] The comparator is an important module in the ADC, and the transmission delay of the comparator is one of the important factors determining the conversion speed of the entire ADC. [0004] For example, a SAR (Successive Approximation Register) type ADC performs comparison bit by bit, that is, it can only be compared once per clock cycle, and N bits need to be compared N times. When the voltages of the two inputs of the comparator are infinitely close, the output of the comparator is delayed by more than...

AI Technical Summary

Problems solved by technology

[0007] In view of this, the application provides a comparator delay correction circuit, method and ADC in the ADC to solve the technical problem that the analog-to-digital conversion machine cannot work normally when the voltages input by the two input terminals of the comparator are infinitely close , the application provides the following technical solutions:

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