T. Tsukutani et al., CANCELLATION TECHNIQUE OF PARASITICS IN ACTIVE-FILTER DESIGN, IEICE transactions on fundamentals of electronics, communications and computer science, E76A(6), 1993, pp. 957-960
This letter presents a technique to cancel the parasitic effects of op
erational amplifier (op amp) in active filter design. To minimize the
effects, an op amp model considering the parasitics (i.e. both parasit
ic poles and zeros) is utilized. It is shown that undesirable factors
in the transfer function due to the parasitics can be canceled well by
predistorting the passive element values of the circuit. As an exampl
e, an active-R highpass filter is evaluated both theoretically and num
erically. In this way, the proposed technique can be effectively incor
porated into the design of active filters.