An ideal inverting op-amp circuit is to be designed with a closed-loop voltage gain of Aυ = –1000. The largest resistor value to be used is 500 kΩ. (a) If the simple two-resistor design shown in Figure 9.8 is used, what is the input resistance? (b) If the T-network design shown in Figure 9.12 with R3 = 500 kΩ and R2 = R4 = 250 kΩ is used, what is the input resistance?
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