Modeling Op Amp Nonlinearity in Switched-Capacitor Sigma-Delta Modulators

Author

Abdelfattah, Khaled ; Razavi, Behzad

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA

fYear

2006

Firstpage

197

Lastpage

200

Abstract

A system-level methodology for the inclusion of op amp nonlinearity in discrete-time integrators and SigmaDelta modulators is proposed that consists of a hyperbolic tangent model for the input/output characteristic of op amps and a recursive solution of nonlinear integrators. Simulations at different levels of abstraction indicate that the methodology incurs an error of no more than 1.1 dB in the magnitude of harmonics while providing a 50times advantage in the simulation speed with respect to transistor-level implementations

Keywords

analogue circuits; circuit simulation; integrating circuits; modulators; operational amplifiers; sigma-delta modulation; switched capacitor networks; SigmaDelta modulators; discrete-time integrators; hyperbolic tangent model; nonlinear integrators; op amp nonlinearity; recursive solution; switched-capacitor sigma-delta modulators; Bandwidth; Clocks; Delta-sigma modulation; Frequency; Linearization techniques; Mathematical model; Operational amplifiers; Switches; Switching circuits; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference, 2006. CICC '06. IEEE

Conference_Location

San Jose, CA

Print_ISBN

1-4244-0075-9

Electronic_ISBN

1-4244-0076-7

Type

conf

DOI

10.1109/CICC.2006.320908

Filename

4114938