Sample problems Topic: Operational Amplifiers Statement of problem The opamps in the circuit are ideal. -+-+ai5V−5V−5V5V400mV30kΩ120kΩ1kΩ90kΩ15kΩ500mV(a) Findai. (b) Find the value of the right source voltage for which0ai=. Solution (a) The idea is to find out output voltages of the two opamps, and then to find out the current in between. The left opamp is virtually grounded, so the current flowing through the left source is 150033.315mViAkμ−== −ΩThen its output voltage is obtained using KVL 11903ovikV= − ×Ω =(1) Repeating the same process for the right source and opamp, its output voltage is obtained
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