A simple way to analyze op amp circuits is to take advantage of the fact
that in an op amp negative feedback circuit, the differential input
voltage is ideally zero. I call this the "Theory of the Happy Op Amp."
Generally, you can determine the voltage at the non-inverting input and
assume the voltage at the inverting input is the same, then analyze the
rest of the circuit using Ohm's Law based on that assumption. A sample of
using this technique (analysis of an instrumentation amplifier) is at
http://kauko.hallikainen.org/cuesta/et113/InstrumentationAmpAnalysis.pdf


Harold



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