Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Sigma-Delta analog-to-digital converter

A technology of analog-to-digital converters and converters, applied in the direction of incremental modulation, etc., can solve the problems of inability to eliminate quantization noise, large harmonic distortion, and low precision of the first-stage Σ-Δ modulation circuit, and achieve high SNR, total Harmonic distortion is small and the effect of eliminating quantization noise

Inactive Publication Date: 2010-06-09
海宁市盐官工业投资有限公司
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing Σ-Δ AD converter cannot eliminate the quantization noise of the first-stage Σ-Δ modulation circuit, resulting in relatively large harmonic distortion and low precision

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sigma-Delta analog-to-digital converter
  • Sigma-Delta analog-to-digital converter
  • Sigma-Delta analog-to-digital converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: b=0.9; a1=a2=1; a3=1.5; b1=1; c1=c2=1; c3=1.5; d1=1; k=4 / 9. Among them, through the matching of various parameters, the quantization noise of the first-stage Σ-Δ modulation circuit can be eliminated, and a higher signal-to-noise ratio can be achieved. As shown in 3, the signal-to-noise ratio of the output signal has reached more than 150dB. The total harmonic distortion is very small, such as Figure 4 As shown, the total harmonic distortion THD is almost zero.

Embodiment 2

[0049] Embodiment 2: b=-0.5; a1=0.1; a2=0.2; a3=0.2; b1=0.5; c1=0.1; c2=0.2; c3=0.2; d1=0.5; k=1.

Embodiment 3

[0050] Example 3: b=-0.3; a1=0.1; a2=0.2; a3=0.2; b1=0.1; c1=0.1; c2=0.2; c3=0.2; d1=0.1; k=1 in the above groups of data In the case where the quantizers 8 and 22 are two-bit quantizers and multi-bit quantizers respectively, there are preferred embodiments. Quantization noise E introduced by quantizer 8 1 does not affect the final output Y, and the quantization noise E introduced by the quantizer 22 2 Plays a vital role in the final output signal Y. Thus, reducing the quantization noise E 2 , THD (Total Harmonic Distortion) of the modulator will decrease accordingly, and the signal-to-noise ratio SNR will increase.

[0051] Integrator 10 introduces transfer function 1 / A(Z), namely the function A(z) related to z. Its setting purpose is to: eliminate The output signal Y of the first stage Σ-Δ modulation circuit A1 1 and the output signal Y of the second stage Σ-Δ modulation circuit A2 2 The quantization error E introduced by the quantizer 8 1 , and the quantization error...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides a Sigma-Delta analog-to-digital converter, which comprises first and second adders, first and second integrators, a first quantizer, a first-order Sigma-Delta modulation circuit of a first DA converter, third and fourth adders, third and fourth integrators, a second quantizer, a second-order Sigma-Delta modulation circuit of a second DA converter, and a noise shaping circuit for shaping the noises of the first-order Sigma-Delta modulation circuit and the second-order Sigma-Delta modulation circuit. The noise shaping circuit performs the integration and scale conversion on digital signals output by the first quantizer, performs the scale conversion on digital signals output by the second quantizer, and then adds up and outputs the converted signals. The Sigma-Delta analog-to-digital converter eliminates quantizing noise of the first-order Sigma-Delta modulation circuit and can improve SNR (signal to noise ratio) and reduce total harmonic distortion by cascading two Sigma-Delta modulation circuits of second order or more than two order and then performing noise shaping on signals output by the second-order Sigma-Delta modulation circuits.

Description

technical field [0001] The present invention relates to a sigma-delta (Σ-Δ) type analog-digital (AD) converter used in the fields of audio power amplifier and signal communication, and in particular to a Σ-Δ modulation circuit with two or more stages Perform cascaded sigma-delta analog-to-digital converters. Background technique [0002] With the speed of VLSI becoming faster and more integrated, Σ-Δ modulation, as an effective way to realize high-resolution analog-to-digital (A / D) conversion, has attracted more and more attention. The sigma-delta AD converter performs coarse quantization in one or more feedback loops. By sampling at a frequency much larger than the signal bandwidth, the feedback loop can modulate the quantization noise so that most of the noise Move outside the signal bandwidth. The Σ-Δ type AD converter digitizes the analog signal at a very high repetition sampling rate, and at the same time completes the noise shaping that pushes the noise to the high f...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/02
Inventor 马双双李海张礼振杨云冯卫
Owner 海宁市盐官工业投资有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com