Title :
On the effect of op-amp finite gain in delta-sigma modulators
Author :
Leuciuc, Adrian ; Mitrea, Cristian
Author_Institution :
Dept. of Electr. & Comput. Eng., State Univ. of New York, Stony Brook, NY, USA
Abstract :
The effect of finite gain of op-amps in both discrete-time (switched-capacitor) and continuous-time (Gm-C) implementations of delta-sigma modulators is studied. It is shown that a continuous-time realization is less sensitive to finite gain of op-amps. Specifying a maximum admissible drop in the SNR due to the finite gain of op-amps, the values of these gains for each of the delta-sigma integrating stages can be determined. The results are obtained using the linear model for the quantizer and are validated by performing direct simulations of the delta-sigma modulators
Keywords :
continuous time systems; delta-sigma modulation; discrete time systems; operational amplifiers; quantisation (signal); SNR; continuous-time implementation; delta-sigma modulators; direct simulations; discrete-time implementation; linear model; maximum admissible drop; op-amp finite gain; quantizer; Circuit topology; Complexity theory; Delay; Delta modulation; Intensity modulation; Operational amplifiers; Performance analysis; Performance gain; Power dissipation; Transfer functions;
Conference_Titel :
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
Conference_Location :
Geneva
Print_ISBN :
0-7803-5482-6
DOI :
10.1109/ISCAS.2000.856170
