Time domain A/D converter group

Abstract

The invention provides a time domain A / D converter group that comprises a plurality of A / D converters. Each A / D converter comprises: a delay lock loop circuit, which takes a main clock supplying a clock to an integrated circuit as an input, performs frequency division on the main clock to output a multi-phase clock with different time sequences; a logic circuit, which synthesizes a plurality of clocks corresponding to Gray codes according to the multi-phase clock; and a plurality of A / D converters next to each other in space. The delay lock loop circuit and the logic circuit are dispersed in the integrated circuit; the A / D converters supply multiple clocks to one A / D converter module; each A / D converter comprises a comparator that compares an input signal with a reference voltage to generate a comparison output signal and an internal A / D converter; and the internal A / D converter comprises a latch, which maintains the logic state of the multi-phase clock according to the time sequence provided by the comparison output signal and a counter, which counts the clock having the largest width of the plurality of clocks and stops counting according to the comparator.

Description

[0001] This application is a Chinese invention patent application submitted on April 8, 2020, with the application number 201880065606.X, and the title of the invention is "Time Domain A / D Converter Group and Sensor Device Using the Time Domain A / D Converter" divisional application. technical field [0002] The present disclosure relates to a time domain A / D converter and a sensor device using the time domain A / D converter. More specifically, it relates to a time-domain A / D converter, which has: an input signal level determination part; a plurality of reference signal generation circuits, at least one of which generates a signal capable of converting The reference signal of the full-scale (Full Scale) input signal, one of the other reference voltage generation circuits generates a reference signal that periodically scans the limited voltage range multiple times and performs averaging processing; or a delay-locked loop circuit, the delay-locked loop The circuit is used to outp...

AI Technical Summary

Problems solved by technology

However, in order to suppress noise, a large capacitor of 10pF to 20pF is often used, resulting in not only an increase in area, but also an increase in power consumption

[0025] Therefore, A / D converters used in existing sensor devices cannot achieve the high dynamic range required by sensors at high speed and low power consumption

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