Litigation involving the intellectual property of your company can run the gamut from liability lawsuits to patent action.  In either case one wants both an expert opinion about how a circuit works and independent confirmation of the same.  I can provide you with one of those opinions.  

One can concentrate on idealized concepts conceived with ideal components or one can look at the performance limit of a very specific circuit constructed with a specific type of parts (or indeed a specific component).  In either type of problem I may be able to enhance your understanding of a specific circuit.

Let me know what you need!