For the circuit in Fig. P17.89: I1 Gm2 C Gm1 + + + 1 2 V1 Zin V1 I1 Figure P17.89 (a)
Chapter 17, Problem 17.89(choose chapter or problem)
For the circuit in Fig. P17.89: I1 Gm2 C Gm1 + + + 1 2 V1 Zin V1 I1 Figure P17.89 (a) Show that the input impedance Zin is that of an inductance L and find an expression for L. (b) Use the inductance generated at the input to form an LCR resonator. To realize the resistance R, use a third transconductor Gm3. (c) Use a fourth inverting transconductor Gm4 with its input connected to an input voltage Vi and its output connected to node 1. Compare the circuit thus created to the two-integrator-loop GmC filter of Fig. 17.37(b). (d) What filter function is (i) V1/Vi , (ii) V2/Vi ?
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