Title :
A 200-MHz continuous-time CMOS delta-sigma modulator featuring nonlinear feedback control
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
We present the design and the experimental verification of a stabilized 200 MHz single-bit fifth-order continuous-time delta-sigma modulator. The integrated circuit is developed in a 0.35 μm triple-metal double-poly CMOS process and includes both modulator and nonlinear feedback controller operating from a 3.0 V supply. Our controller architecture, valid for loop filters of any finite order, guarantees stability under mild conditions and is based on advanced switching concepts derived from variable-structure theory. Theoretical, simulation and experimental results are provided.
Keywords :
CMOS integrated circuits; analogue-digital conversion; circuit feedback; circuit stability; delta-sigma modulation; integrated circuit design; variable structure systems; 0.35 micron; 200 MHz; 3.0 V; ADC; CMOS delta-sigma modulator; continuous-time modulator; finite order loop filters; nonlinear feedback control; single-bit fifth-order modulator; stability; variable-structure switching theory; Adaptive control; CMOS integrated circuits; CMOS process; Delta modulation; Detectors; Feedback control; Filtering theory; Filters; Mixed analog digital integrated circuits; Stability;
Conference_Titel :
Custom Integrated Circuits Conference, 2003. Proceedings of the IEEE 2003
Print_ISBN :
0-7803-7842-3
DOI :
10.1109/CICC.2003.1249377
