Analog-to-digital conversion circuit

Abstract

The invention relates to an analog-to-digital conversion circuit comprising at least two side-by-side analog-to-digital conversion units. Each analog-to-digital conversion unit comprises a NMOS transistor, wherein the grid electrode of the NMOS transistor is connected with an input voltage; the source electrode and the drain electrode of the NMOS transistor are connected to the two ends of a first capacitor respectively; the source electrode is grounded; and the drain electrode is connected with a power supply through the drain electrode and the source electrode of a first PMOS transistor. The grid electrode of the first PMOS transistor is connected with a clock circuit; and the drain electrode of the NMOS transistor and the drain electrode of the first PMOS transistor are connected with the grid electrode of a second PMOS transistor together through a first inverter. The source electrode of the second PMOS transistor is connected with the power supply, and the drain electrode is output through a resistor and a first switch and through a second switch and a second capacitor, wherein the second switch and the second capacitor are connected in parallel and one end of the second switch and one end of the second capacitor are grounded. The first switch and the second switch are controlled by the clock circuit and on / off time are opposite. The analog-to-digital conversion circuit is simple in overall structure and suitable for a single-ended circuit; internal reference and a non-overlapping clock are not needed, and the analog-to-digital conversion circuit can be well suitable for application with ultra-low power consumption; besides, an operational amplifier is not needed, and the analog-to-digital conversion circuit is suitable for nanoscale technology and can be well suitable for application of high-speed analog-to-digital conversion.

Description

technical field [0001] The present invention relates to electronic circuits, in particular to analog-to-digital conversion circuits. Background technique [0002] Today's world is a highly information-based society. The ever-changing digital communication technology promotes the rapid development of society. It has become a common choice to use digital signal processing systems for information processing. However, various objects and signals in the real world are analog, so An analog-to-digital converter is needed to convert the analog signal to a digital signal. [0003] The most important parameters of an analog-to-digital converter (ADC) are the conversion accuracy and conversion rate. Usually, the accuracy is expressed by the number of binary digits of the output digital signal, and the rate is expressed by the number of conversions per second. The more digits the converter can accurately output the digital signal, the stronger the ability of the converter to distinguis...

AI Technical Summary

Problems solved by technology

However, time-based analog-to-digital converters still have problems such as complex system structure and low precision, and cannot meet the needs of current corresponding mode converters.

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