A high resolution sigma-delta modulator with extended dynamic range

2002 ◽  
Author(s):  
L.A. Williams ◽  
B.A. Wooley
Keyword(s):  
High Resolution ◽  
Dynamic Range ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Extended Dynamic

A High-Resolution Lowpass Sigma-Delta Modulator Applied in Micro-Gyroscope

2014 ◽  
Vol 609-610 ◽  
pp. 964-967
Author(s):  
Jia Jun Zhou ◽  
Di Wang ◽  
Ying Kai Zhao ◽  
Hong Lin Xu ◽  
Xiao Wei Liu
Keyword(s):  
High Resolution ◽  
Dynamic Range ◽  
Sampling Frequency ◽  
Cmos Process ◽  
Effective Number ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
The Stability ◽  
Oversampling Ratio ◽  
Input Level

In this paper, in order to enhance resolution and guarantee the stability of the micro-gyroscope, a high-resolution lowpass sigma-delta modulator is proposed. It employs single-loop fourth-order and full differential structure. The simulated result on the Simulink platform shows that the SNDR is 105.4dB and the effective number of bits (ENOB) is 17.22bits. The entire circuits are implemented with 0.5μm CMOS process. The simulated result on Cadence shows that the SNDR is 99.7dB. The modulator operates at a sampling frequency of 25.6MHz and the signal bandwidth is 100kHz with 128 oversampling ratio (OSR). The dynamic range (DR) is 120 dB approximately and the SNDR changes linearly with the input level.

scholarly journals Second-order sigma-delta modulator in standard cmos technology

2004 ◽  
Vol 1 (3) ◽  
pp. 37-44 ◽  
Author(s):  
Dragisa Milovanovic ◽  
Milan Savic ◽  
Miljan Nikolic
Keyword(s):  
Dynamic Range ◽  
Cmos Technology ◽  
Second Order ◽  
Clock Frequency ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Power Meter ◽  
Sampling Ratio

As a part of wider project sigma-delta modulator was designed. It represents an A/D part of a power meter IC. Requirements imposed were: SNDR and dynamic range > 50 dB for maximum input swing of 250 mV differential at 50 Hz. Over sampling ratio is 128 with clock frequency of 524288 Hz which gives bandwidth of 2048 Hz. Circuit is designed in 3.3 V supply standard CMOS 0.35 ?m technology.

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