sreid,
Basically I'm still at the same point as my last post. There have been continuing discussions here of trying to create a stable 1/1-s function block by using different circuit topologies - all of which are unstable. The issue then is further confused by dissecting the open-loop response...
sreid and dford-
Thanks. With your help I now have a better understanding of what can and can't be done. My control theory skills are a little rusty. The Astrom paper showed that a RHP in the system function can be stabilized.
I have been able to simulate a PSPICE circuit using real opamp...
sreid - Thanks for the paper. I will check it out in depth ASAP.
dford - Thanks for the suggestion - so you are saying it can be done? Maybe it can be built, but will it be stable? For example, certainly the transfer function of an ocsillator could also be implemented but would it respond to an...
Thank you sreid for your reply. What a relief to get another unbiased opinion on this confusing subject. I appreciate your feedback.
You have my agreement 100% that what is being proposed is a predictive, non-causal device that would be a revolutionary 'miracle cure' for many areas of science...
Help. My boss thinks we can build a low pass circuit with 90 degree phase lead (i.e. normalized transfer function 1/1-s). I think this is clearly impossible but he disagrees. A conventional phase lead network is not good enough for him because it increases magnitude with frequency. I thought...
