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op_amp_problem5 - Sample problems Topic Operational...

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Sample problems Topic: Operational Amplifiers Statement of problem The circuit inside the shaded area is a constant current source for a limited range of values of L R . - + L R L i g i L i L R 9 V 9 V 47 k Ω 1.5 k Ω 3 V Find the value of L i for 2.5 L R k = Ω . Solution Due to the virtual open property at the negative port, the circuit looks like - + L i L R 9 V 9 V 47 k Ω 1.5 k Ω 3 V v v From the left hand side circuit, the voltage at the negative port is 3 v V = Therefore at the positive port
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