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Single-bit sigma delta DAC circuit

A single-bit, circuit technology, applied in the field of signal processing, can solve the problems of high frequency requirements, reduce the switching frequency of 1-bit DAC signals, etc., to achieve the effect of reducing operating frequency requirements, reducing dynamic range, and saving circuit costs

Pending Publication Date: 2022-06-17
HANGZHOU NATCHIP SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-performance single-bit sigma delta DAC circuit that reduces the signal switching frequency of 1-bit DAC for the high-performance single-bit sigma delta DAC.

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  • Single-bit sigma delta DAC circuit

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the embodiments. The following embodiments are only specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any non-substantial changes to the present invention by using this concept should belong to the protection scope of the present invention.

[0018] like figure 1 As shown, a single-bit sigma delta DAC circuit includes an upsampling filter UP, a high-order single-bit sigma delta modulator SDM with adjustable threshold, a 1-bit DAC circuit and a threshold generation module T. The higher-order single-bit sigmadelta modulator SDM includes a noise shaping filter F and a quantizer Q with an adjustable threshold. The signal input terminal 1 of the sampling filter UP receives an external digital signal, the signal output terminal 2 is connected to the signal input terminal 3 of the noise shaping filter F, and the signal output termi...

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Abstract

The invention discloses a single-bit sigma delta DAC (Digital to Analog Converter) circuit. The high-order single-bit sigma delta modulator comprises an up-sampling filter, a high-order single-bit sigma delta modulator, a 1-bit DAC (Digital-to-Analog Converter) circuit and a threshold generation module, wherein the high-order single-bit sigma delta modulator comprises a noise shaping filter and a quantizer. The threshold value generation module comprises a unit time signal high-low level conversion frequency counting device, a maximum threshold value limiting device and a threshold value adjusting device. The high-low level conversion frequency counting device counts the high-low level conversion frequency of the quantizer output signal in unit time; the maximum threshold limiting device determines a maximum threshold according to the amplitude of the input signal; and the threshold value adjusting device receives the high-low level conversion times and the maximum threshold value of the output signal of the quantizer, and inputs the current threshold value into the quantizer in combination with the built-in set times. According to the invention, the circuit cost is saved, the introduced nonlinear error is avoided, and the cost and implementation difficulty of the 1-bit DAC are reduced.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to the technical field of digital-to-analog conversion circuits (DAC), and relates to a high-performance single-bit sigma delta DAC circuit with bit width modulation. Background technique [0002] DAC converts digital signals into analog signals and is a functional module commonly used in modern digital signal processing. Sigma delta DAC is a DAC technology based on oversampling and noise shaping, which is widely used in the field of low-to-medium-speed and high-precision DACs. Sigma delta DAC is divided into single-bit quantization and multi-bit quantization. Since single-bit quantization has a natural high linearity, it avoids the requirement of component matching accuracy and becomes an important field. [0003] Existing single-bit sigma delta DACs use a high-order single-bit sigma delta modulator to generate a 1-bit data stream followed by a 1-bit DAC. To achieve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/00
CPCH03M3/39H03M3/50
Inventor 梁骏叶丰王洪海陈余浪杨智健李俊立
Owner HANGZHOU NATCHIP SCI & TECH
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