A triple-mode feed-forward sigma-delta modulator design for GSM / WCDMA / WLAN applications

2007 ◽  
Author(s):  
B. R. Jose ◽  
J. Mathew ◽  
P. Mythili ◽  
D. K. Pradhan
Keyword(s):  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Feed Forward ◽  
Triple Mode

Design of Third-Order Single-Loop Full Feed-Forward Sigma Delta Modulator

2014 ◽  
Vol 609-610 ◽  
pp. 1176-1180
Author(s):  
Liang Liu ◽  
Song Chen ◽  
Chong He ◽  
Liang Yin ◽  
Xiao Wei Liu
Keyword(s):  
Model Building ◽  
Inertial Sensors ◽  
Sampling Rate ◽  
Third Order ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Feed Forward ◽  
Single Loop ◽  
Local Feedback ◽  
Sigma Delta Adc

Sigma Delta modulator is widely used in ADC for kinds of micro inertial sensors, Sigma Delta ADC can be easily integrated with digital circuits. It possesses some performances of good linearity and high accuracy, while it has no such strict requirements for the match of device dimensions. In this paper, the design of third-order Sigma Delta modulator with a structure of single-loop full feed-forward is accomplished, meanwhile it uses local feedback for zero optimization to improve the shaping capacity of the modulator noise within the signal bandwidth. The OSR (over-sampling rate) of the modulator is 128 and the signal bandwidth is 10 kHz. By the system model building and simulation in the Simulink of MATALAB, the SNR is 96.3 dB and the ENOB is 15.71 bits. Then the modulator is implemented into transistor-level circuits with 0.5um process, by the simulation in Spectre of Cadence, the SNR is 88.5 dB and the ENOB is 14.41 bits. 搜

A Feed-Forward Sigma-Delta Modulator Applied in Silicon Gyroscope

2015 ◽  
Vol 645-646 ◽  
pp. 657-661
Author(s):  
Qi Shao ◽  
Qiu Ye Lv ◽  
Hao Meng ◽  
Qiang Fu ◽  
Xiao Wei Liu
Keyword(s):  
Sampling Rate ◽  
Ideal Model ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Feed Forward ◽  
Single Loop ◽  
Local Feedback ◽  
Signal Band

Aiming to be applied in silicon gyroscope, a three-order single loop feedforward modulator with three-bit quantizer and local feedback is designed in this paper. Signal band is 200 KHz, sampling rate is 25.6 MHz, OSR is 64. Ideal modulator is then designed and simulated in MATLAB, getting SNR 125dB. Non-ideal factors are also added to ideal model, DWA technology is adopted to restrain the nonlinearity of multi-bit quantizer, getting SNR 104dB. Finally, transistor-level full-difference modulator is designed and simulated in Cadence, fetting SNR 101.3dB.

Wide dynamic-range sigma–delta modulator with adaptive feed-forward coefficients

2010 ◽  
Vol 4 (2) ◽  
pp. 99 ◽  
Author(s):  
R.-G. Chang ◽  
C.-Y. Chen ◽  
J.-H. Hong ◽  
S.-Y. Lee
Keyword(s):  
Dynamic Range ◽  
Wide Dynamic Range ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Feed Forward
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