ghl@tybalt.caltech.edu (Gwoho H. Liu) (03/17/90)
i have a feedback amplifier that seems to over shoot a step by over 100% then it jiggles a bit and flattens out. it does not ossilate for ever and ever. can someone explain this?
ankleand@mit-caf.MIT.EDU (Andrew Karanicolas) (03/17/90)
In article <1990Mar16.204939.1176@spectre.ccsf.caltech.edu> ghl@tybalt.caltech.edu (Gwoho H. Liu) writes: >i have a feedback amplifier that seems to over shoot a step by over >100% then it jiggles a bit and flattens out. it does not ossilate >for ever and ever. can someone explain this? One way to achieve more than 100% overshoot with a stable amplifier is with a closed loop zero. In this case, the step response is not the classic two-pole feedback system step response. If you can supply more circuit details, then the origin of this closed loop zero could be investigated. Andrew Karanicolas MIT Microsystems Laboratory ankleand@caf.mit.edu