Title :
Feed-forward gain compensation for CMOS continuous-time ΣΔ modulators
Author :
Luh, Louis ; Choma, John, Jr. ; Draper, Jeffrey
Author_Institution :
Univ. of Southern California, Los Angeles, CA, USA
Abstract :
Feed-forward gain compensation schemes can stabilize the loop gains of CMOS continuous-time ΣΔ modulators without introducing extra feedback loops. These methods accurately control the gain of each integrator in the modulator to optimize the modulator´s dynamic range. Without internal feedback for the integrators, these modulators can operate at much higher speeds. Two different gain compensation schemes, one with reference current generators and the other with voltage-controlled voltage-to-current converters, are presented. Their circuit design issues and performance limitations are discussed and compared
Keywords :
CMOS integrated circuits; compensation; continuous time systems; feedforward; gain control; integrated circuit design; modulators; sigma-delta modulation; CMOS continuous-time ΣΔ modulators; circuit design issues; dynamic range; feedforward gain compensation; integrator gain control; loop gains; performance limitations; reference current generators; voltage-controlled V-I converters; voltage-to-current converters; Capacitors; Circuit synthesis; Delta modulation; Dynamic range; Feedback loop; Feedforward systems; Quantization; Resistors; Sampling methods; Voltage control;
Conference_Titel :
Electronics, Circuits and Systems, 1999. Proceedings of ICECS '99. The 6th IEEE International Conference on
Conference_Location :
Pafos
Print_ISBN :
0-7803-5682-9
DOI :
10.1109/ICECS.1999.814499
