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Frequency compensation of MOS operational transconductance amplifiers
Author(s) -
Kothapalli Ganesh
Publication year - 1991
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.4490190304
Subject(s) - frequency compensation , compensation (psychology) , capacitor , transconductance , context (archaeology) , operational amplifier , phase margin , amplifier , electronic engineering , flexibility (engineering) , compensation methods , operational transconductance amplifier , engineering , control theory (sociology) , computer science , electrical engineering , voltage , mathematics , cmos , transistor , artificial intelligence , psychoanalysis , world wide web , biology , psychology , paleontology , control (management) , return on marketing investment , statistics , digital marketing
Operational transconductance amplifiers (OTAs) can be compensated by a capacitor placed in the differential‐to‐single‐ended (D/SE) conversion stage. the concept involved in shaping the magnitude and phase‐frequency response of OTAs is to realize a low‐frequency zero such that the effects of double poles prior to unity gain are not felt. It is sometimes possible to meet the objectives of gain and phase margin by providing compensation in more than one stage. the flexibility of the scheme devised is demonstrated by suggesting alternative ways (two‐capacitor compensation) to realize desired root locations. the key point in achieving proper compensation always remains the appropriate choice of capacitor size. Thus the size of the compensation capacitor and placement of the compensation network have been presented here from the context of suitability for implementation in MOS foundries. the compensation schemes discussed are suitable in the second or additional gain stages.