Figure P11-70 shows an interconnection of three basic OP AMP modules.

(a) Does this interconnection involve loading?

(b) Find the overall transfer function of the interconnection and locate its poles and zeros.

(c) Build this circuit in Multisim. Do an ac sweep from 10 \(\mathrm{Hz}\) to \(100 \mathrm{kHz}\). Locate the maximum or the minimum. Use \(\mathrm{dB}\) for the magnitude axis.

(d) Can you think of a use for this circuit?