Title :
An equivalent circuit model for two-stage operational amplifiers
Author :
Yang, Howard C. ; Allstot, David J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Oregan State Univ., Corvallis, OR, USA
Abstract :
The two-pole equivalent-circuit model for frequency compensation has been improved to provide more accurate unity-gain phase margin calculations for a two-stage operational amplifier when the second-stage pole is dominant. The increased accuracy allows for minimum settling time compensation, which gives maximum speed in switched-capacitor circuit applications. The model also clarifies some confusion that has existed previously regarding pole-splitting compensation. SPICE2 simulations were used to verify the improved equivalent circuit model.<>
Keywords :
compensation; equivalent circuits; lumped parameter networks; operational amplifiers; switched capacitor networks; SPICE2 simulations; equivalent-circuit model; frequency compensation; operational amplifiers; pole-splitting compensation; settling time compensation; speed maximisation; switched-capacitor circuit applications; unity-gain phase margin calculations; CMOS technology; Capacitance; Circuit simulation; Equivalent circuits; Frequency; Gallium arsenide; Operational amplifiers; Semiconductor device modeling; Switched capacitor circuits; Switching circuits;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo, Finland
DOI :
10.1109/ISCAS.1988.15006
