Continuous approximation analog-to-digital conversion circuit and method

Abstract

A continuous approximation type analog-to-digital conversion circuit and a method therefor are disclosed. The method comprises the following steps: a continuous approximation type analog-to-digital converter is used for performing a sampling operation and a comparison operation according to a conversion clock pulse so as to convert an analog input signal into a digital output signal; when a continuous approximation motion is completed during the comparison operation, and a sampling and digital-to-analog conversion circuit of the continuous approximation type analog-to-digital converter is reset. Via the continuous approximation type analog-to-digital conversion circuit and the method therefor disclosed in the invention, design costs of an input buffer device used for driving the continuous approximation type analog-to-digital converter and a reference buffer device used for pushing the sampling and digital-to-analog conversion circuit can be reduced.

Description

technical field [0001] The invention relates to an analog-to-digital conversion technology, in particular to a continuous approximation analog-to-digital conversion circuit and a method thereof. Background technique [0002] Analog-to-digital converters (analog-to-digital converters, ADCs) have various architectures and each has its own advantages. Among them, the Successive Approximation Register (SAR) ADC has the characteristics of low power consumption, small area and low cost, and has been widely used in electronic devices in recent years. [0003] With the improvement of architecture and technology, SAR ADCs are also beginning to develop high-speed applications, especially timing-interleaved (TI) SAR ADCs are often used. Since the SAR ADC uses a binary search algorithm (binary search algorithm) to obtain a digital output signal that matches the analog input signal. Therefore, SARADC needs a higher bit cycle clock (Bit cycling clock) than the sampling frequency to real...

AI Technical Summary

Problems solved by technology

The continuous approximation analog-to-digital converter performs a sampling operation and a comparison operation according to a conversion clock to convert an analog input signal into a digital output signal

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