Title :
Switched current sigma-delta modulators
Author :
Yilmaz, A. ; Wong, K.C. ; Chao, K.S.
Author_Institution :
Dept. of Electr. Eng., Texas Tech. Univ., Lubbock, TX, USA
fDate :
31 May-2 Jun 1995
Abstract :
Oversampling sigma-delta (ΣΔ) modulators using switched current (SI) techniques are presented. The first modulator is a 1-1 MASH modulator. The second structure is a second-order loop which is formed by a 1-bit quantizer with two feedback loops. The device ratio insensitive SI integrator is designed by using two class AB-regulated cascode dynamic current copiers. The effects of the current copier and SI integrator errors on the performance of the modulators are also discussed
Keywords :
CMOS integrated circuits; circuit feedback; errors; integrating circuits; modulators; sigma-delta modulation; switched current circuits; 1-1 MASH modulator; 1-bit quantizer; SI integrator errors; cascode dynamic current copiers; class AB-regulated current copiers; device ratio insensitive SI integrator; feedback loops; oversampling ΣΔ modulators; second-order loop; sigma-delta modulators; switched current techniques; CMOS technology; Capacitors; Chaos; Circuits; Delta-sigma modulation; Feedback loop; Multi-stage noise shaping; Signal processing; Switches; Voltage;
Conference_Titel :
VLSI Technology, Systems, and Applications, 1995. Proceedings of Technical Papers. 1995 International Symposium on
Conference_Location :
Taipei
Print_ISBN :
0-7803-2773-X
DOI :
10.1109/VTSA.1995.524721
