Delta-sigma analog-to-digital conversion apparatus and method thereof

Abstract

The invention provides a delta-sigma analog-to-digital conversion apparatus and a method thereof. The delta-sigma analog-to-digital conversion apparatus for receiving an analog input signal to generate a digital output signal includes a subtracting unit, a quantizer, a feedback unit and a transition function compensation unit, wherein the subtracting unit is utilized for performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal; the quantizer is coupled to the subtracting unit and utilized for performing quantization to generate a quantized signal according to the subtracted signal, the feedback unit is coupled between the subtracting unit and the quantizer, and utilized for providing the feedback signal to the subtracting unit according to the quantized signal, the transition function compensation unit is coupled to the quantizer and used for compensating the transition function variation of the quantized signal and generating a digital output signal, the subtracting unit is arranged to reduce signal input swing of the quantizer. All the delta-sigma analog-to-digital conversion apparatus and the method thereof can effectively improve system stability, improve operation speed, and reduce energy consumption.

Description

technical field [0001] The present invention relates to an analog-to-digital conversion scheme, and particularly to a delta-sigma (delta-sigma) analog-to-digital conversion device and a delta-sigma analog-to-digital conversion method. Background technique [0002] Conventional analog-to-digital conversion devices with continuous-time delta-sigma modulation typically include quantizers. Quantizers are typically implemented using flash ADCs, that is, ADCs with high-speed signal processing. If the flash ADC includes multi-bit outputs, more comparators are required to implement the above flash ADC. A very large number of comparators will bring more expense to conventional analog-to-digital conversion equipment. In addition, a digital-to-analog converter (DAC), which is generally used to directly feed back a feedback signal from the output terminal of the quantizer to the input terminal of the quantizer, may not be able to achieve system stability, and it has a large bandwidth / ...

AI Technical Summary

Problems solved by technology

A very large number of comparators will add more expense to conventional analog-to-digital conversion equipment

In addition, a digital-to-analog converter (DAC), which is generally used to directly feed back a feedback signal from the output terminal of the quantizer to the input terminal of the quantizer, may not be able to achieve system stability, and it has a large bandwidth / Limitation of high operating speed

Both of the above problems cause serious trouble

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