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Questions related from Lutz von Wangenheim
By chance, I discovered an interesting property of the "Butterworth" approximation: The product of the quality factors Qp for each pole is constant. This applies to any filter order n. * Even n:...
03 March 2019 9,626 10 View
Simple question (back to basics): For a classical diff. amplifier (Q1 and Q2, finite dynamic resistance re in the common emitter leg): How do we calculate the input resistance at the base of Q1 ?
03 March 2019 4,512 35 View
Are there opamp-based circuits which, normally, are designed assuming idealized opamp parameters - however, when simulated based on idealized opamp models (VCVS) they do not function at all?
09 September 2017 1,280 7 View
I am aware that linear oscillators must contain a non-linear part to limit loop gain (or amplitudes) after the start-up phase. Simple case: Amplitude clipping due to supply rails. Then, using the...
07 July 2013 7,497 12 View
My question is: Does anybody know if resp. how it is possible to demonstrate the case of a negative group velocity using any standard simulation program?
07 July 2013 9,573 3 View