This is an error amplifier used in controllers. Here is how to derive the transfer function:
First, bring R2, C1 and C2 under one component, Z2. R2 is in series with C2 and both in parallel with C1.
Z2 = ((R2+(sC2)
-1)
-1+sC1)
-1The amplifier becomes a differential amplifier in AC, with the components in the non-inverting input removed. The transfer function is:
V
COMP=REFERENCE*(1+Z2/R1)-V
OUT*Z2/R1
The differential amplifier transfer function is explained here:
http://masteringelectronicsdesign.com/the-differential-amplifier-transfer-functi....