If the Howland current pump of Fig. 2.6a is implemented with four 10-kΩ resistances and an op amp having a0 = 105 V/V, ft = 1 MHz, rd = ∞, and ro = 0, sketch and label the magnitude plot of the impedance Zo seen by the load. Justify using physical insight.
2. The negative-resistance converter of Fig. 1.21b is implemented with three 10-kΩ resistances and an op amp with GBP = 1 MHz. Find its impedance Zeq. How does it change as f is swept from 0 to ∞?
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