Third-order feedforward Sigma-Delta modulator based on successive comparison quantizer

Abstract

The invention discloses a third-order feedforward Sigma-Delta modulator based on a successive comparison quantizer. The Sigma-Delta modulator comprises three integrators (1), a multi-bit successive comparison quantizer (2), a digit circuit (3), a feedback digital-analog converter (4), a first summator unit (5) and a second summator unit (6), wherein the digit circuit (3) is used for transforming a binary code to a temperature code; the first summator unit (5) is used for calculating the difference between an input signal and the output signal of the feedback digital-analog converter; and the second summator unit is directly composed of multi-input sampling switched capacitor arrays of a successive comparator on a feedforward path. An additional analog summator function circuit or a digital summator function circuit is replaced by the summator units at present. The Sigma-Delta modulator disclosed by the invention has the characteristics of ultra-low power consumption and high resolution.

Description

technical field [0001] The invention relates to a Sigma-Delta analog-to-digital converter, which belongs to the field of integrated circuits. Background technique [0002] With the rapid development of consumer electronics and the wide application of digital technology, the demand for high-precision, low-power, and low-cost analog-to-digital converters is increasing. However, the continuous update of integrated circuit technology leads to the reduction of power supply voltage and the intrinsic gain of transistors. The decline makes the analog circuit design more difficult. Therefore, we need to further adopt innovative low-power consumption design at low voltage to meet the requirements of the system. For the design of low power consumption, high precision, and low cost analog-to-digital converters, it has become a trend to adopt feed-forward Sigma-Delta structured analog-to-digital converters. The key part is the Sigma-Delta modulator. [0003] The input signal of the fe...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of consumer electronics and the wide application of digital technology, the demand for high-precision, low-power, and low-cost analog-to-digital converters is increasing. However, the continuous update of integrated circuit technology leads to the reduction of power supply voltage and the intrinsic gain of transistors. The decline makes analog circuit design more difficult

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