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Universal basis for ranking small‐signal aspects of compensation techniques for operational amplifiers
Author(s) -
Cherry Edward M.
Publication year - 2011
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.689
Subject(s) - bandwidth (computing) , capacitor , topology (electrical circuits) , gain–bandwidth product , electronic engineering , computer science , compensation (psychology) , amplifier , capacitance , operational amplifier , transistor , electrical engineering , control theory (sociology) , engineering , telecommunications , physics , voltage , psychology , control (management) , electrode , quantum mechanics , artificial intelligence , psychoanalysis
A multi‐pole gain‐bandwidth theorem sets an upper bound to the bandwidth that can be achieved with specified DC gain and external load capacitance, for a given selection of transistors and operating points. A product of the poles and zeros is constrained by ∏( g m / C ) evaluated over the forward‐path active devices. Most practical compensation techniques degrade the actual bandwidth, by factors which the paper explores in detail; depending on the circuit topology, some compensating capacitors can add to the intrinsic device capacitances. A few techniques achieve the ideal. Copyright © 2010 John Wiley & Sons, Ltd.