Successive approximation register analog-to-digital converter based on voltage-controlled oscillator quantization

Abstract

The invention provides a successive approximation register analog-to-digital converter based on voltage-controlled oscillator quantization, and belongs to the technical field of analog integrated circuits. The successive approximation register analog-to-digital converter comprises a clock multiplier module, a sampling and holding circuit, a quantizer based on a voltage-controlled oscillator, a successive approximation register, and a digital-to-analog conversion circuit. The quantizer based on a voltage-controlled oscillator comprises a differential input voltage-controlled oscillator and a counter. The differential input voltage-controlled oscillator has positive and negative input ends and an output end, the positive input end is connected with a sampling signal, the negative input end is connected with a comparison reference signal, and the output end is connected with the counter. High and low logic levels quantified by the counter are transferred to the successive approximation register. The defect that a successive approximation register analog-to-digital converter of a traditional structure has high resolution but low sampling rate is overcome. High-speed quantization can be realized. The system bandwidth of the analog-to-digital converter can be increased. High-resolution quantization can be realized at a sampling frequency. The successive approximation register analog-to-digital converter can be used in high-speed and high-precision analog-to-digital conversion.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a successive approximation register type analog-to-digital converter using a voltage-controlled oscillator as a quantizer. Background technique [0002] With the rapid development of electronic technology and the wide application of computers in automatic detection and automatic control, what are processed and transmitted by digital electronic computers are discontinuous digital signals, but most of them are continuously changing analog quantities in practice. After the analog quantity is collected and converted into an analog quantity of an electrical signal by a sensor, it needs to be converted into a digital signal through analog-to-digital conversion, and then input to the digital system for processing and control. The analog-to-digital converter is used as a bridge from analog to digital signal The key to the development of today's electronic t...

AI Technical Summary

Problems solved by technology

In order to achieve high quantization accuracy, the op amp in the comparator needs to provide a large enough gain. However, it is very difficult to design a high-gain, high-speed op amp, which makes it difficult to design a high-bandwidth, high-precision successive approximation register-type analog-to-digital converter.

Therefore, the design of the comparator in the successive approximation register analog-to-digital converter is a compromise between accuracy and speed, and the successive approximation register analog-to-digital converter with high quantization accuracy will have a lower speed

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