Title :
Oversampling sigma-delta modulator stabilized by two local nonlinear feedback loop techniques
Author :
Ho, Chian C. ; Kuo, Chung J.
Author_Institution :
Inf. Appliance Tech. Lab., Chunghwa Telecom Labs., Taoyuan, Taiwan
Abstract :
The proposed scheme relates to techniques called “local nonlinear feedback loop (LNFL)” and “enhanced-LNFL” for stabilization of oversampling sigma-delta modulators. SDM stabilized by LNFL or enhanced-LNFL techniques avoids the instability limitation without SNR degradation. Besides, both proposed approaches to suppress the signal´s swing range can be applied to various configurations of SDMs, such as multiple-loop and single-loop structures, for high stability and low power VLSI applications
Keywords :
VLSI; circuit feedback; circuit stability; low-power electronics; sigma-delta modulation; enhanced-LNFL; instability limitation; local nonlinear feedback loop techniques; low power VLSI; multiple-loop structures; oversampling sigma-delta modulator; single-loop structures; stability; Amplitude modulation; Circuit stability; Degradation; Delta-sigma modulation; Feedback loop; Laboratories; Multi-stage noise shaping; Noise shaping; Quantization; Signal to noise ratio;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921930
