scholarly journals A wideband high-resolution time-interleaved sigma-delta modulator with VCO-based quantizer

2011 ◽  
Vol 8 (23) ◽  
pp. 1972-1977
Author(s):  
Xiao Zhao ◽  
Huajun Fang ◽  
Jun Xu
Keyword(s):  
High Resolution ◽  
Resolution Time ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Time Interleaved

Design of a Fourth-Order Sigma-Delta Modulator for Audio Application

2013 ◽  
Vol 380-384 ◽  
pp. 3580-3583
Author(s):  
Ming Yuan Ren ◽  
Tuo Li ◽  
Chang Chun Dong
Keyword(s):  
High Resolution ◽  
Fourth Order ◽  
High Performance ◽  
Sampling Frequency ◽  
Cmos Process ◽  
Sigma Delta Modulator ◽  
Sigma Delta

Based on requirements on high performance and high resolution of modulators, a fourth-order Sigma-Delta modulator for audio application is developed in this paper. The modulator is designed under the commercial 0.5μm CMOS process and the circuits are given simulations by Spectre. The sampling frequency of sigma-delta modulator is 11.264 MHz, and OSR is 256 within the 22 kHz signal bandwidth. Measure performance shows that Sigma-Delta modulator enables its maximum SNR to achieve 103.5dB, and the accuracy of Sigma-Delta modulator is up to 16 bit.

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