Title :
Op-amp swing reduction in sigma-delta modulators
Author :
Kwon, Sunwoo ; Maloberti, Franco
Author_Institution :
Dept. of Electr. Eng., Texas Univ., Richardson, TX, USA
Abstract :
An integrator´s output swing reduction technique without deteriorating the SNR of a sigma-delta modulator is proposed. The structure uses input feed-forward signals and, for digital feed-forward, an additional extra quantizer. The swing of each integrator goes down by 85%. Moreover, the proposed structure reduces the influence of the harmonic distortion coming from the op-amp nonlinearity. Detailed analysis and various simulation results verify the operation of the method.
Keywords :
circuit simulation; feedforward; harmonic distortion; integrating circuits; low-power electronics; modulators; network analysis; operational amplifiers; sigma-delta modulation; SNR; digital feed-forward; harmonic distortion influence reduction; input feed-forward signal; integrator swing; modulator analysis; modulator simulation; op-amp nonlinearity; op-amp swing reduction; output swing reduction; quantizer; sigma-delta modulator; Circuits; Delta-sigma modulation; Dynamic range; Feedforward systems; Frequency; Harmonic distortion; Inspection; Operational amplifiers; Quantization; Transfer functions;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328247
