Sample problems Topic: Operational Amplifiers Statement of problem The opamp in the circuit is ideal. -+av+−bv+−ov+−18kΩ80kΩ64kΩ72kΩ54kΩ9V9V−biaiThe signal voltages avand bvare 500mV and 1200mV, respectively. (a) Calculate ovin volts. (b) Find aiand biin microamperes. Solution (a) The idea is to find out,,ovvv+−, respectively. Due to the virtual open circuit property, the circuit looks like -+av+−bv+−ov+−18kΩ80kΩ64kΩ72kΩ54kΩ9V9V−biaiv+v+From the right hand side circuit, it is easy to write down the KCL equation at the positive
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