Title :
Nonlinear settling behavior in oversampled converters
Author :
Wang, Feng ; Harjani, Ramesh
Author_Institution :
Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA
Abstract :
We present a new analytical model for opamp induced nonlinearity in oversampled converters. This model incorporates both finite slew rate and finite gain bandwidth effects and is valid for both first order and higher order modulators. Theoretical predictions agree very well with measured results from fabricated ICs. The model consists only of circuit design parameters, and can be utilized to explore design tradeoffs and optimize converter performance. For our design the use of our model resulted in a 40% reduction in power consumption without loss of performance
Keywords :
integrated circuit design; integrated circuit measurement; integrated circuit modelling; operational amplifiers; sigma-delta modulation; circuit design parameters; design tradeoffs; finite gain bandwidth effects; finite slew rate; first order modulators; higher order modulators; nonlinear settling behavior; opamp induced nonlinearity; oversampled converters; power consumption; sigma-delta modulators; Analytical models; Bandwidth; Capacitors; Circuits; Clocks; Computer simulation; Design optimization; Energy consumption; Feedback; Power system modeling;
Conference_Titel :
Custom Integrated Circuits Conference, 1997., Proceedings of the IEEE 1997
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-3669-0
DOI :
10.1109/CICC.1997.606675
