op_amp_problem1

# op_amp_problem1 - Sample problems Topic Operational...

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Sample problems Topic: Operational Amplifiers Statement of problem The opamp in the circuit is ideal. - + a v b v 20 k Ω 5 k Ω 160 k Ω 40 k Ω 0 v + 18 V 18 V (a) Calculate 0 v if 1.5 a vV = and 0 b = . (b) Calculate 0 v if 3 a = and 0 b = . (c) Calculate 0 v if 1 a = and 2 b = . (d) Calculate 0 v if 4 a = and 2 b = . (e) Calculate 0 v if 6 a = and 8 b = . (f) If 4.5 b = , specify the range of a v such that the amplifier does not saturate. Solution According to the virtual open and virtual short circuit properties, the voltage at the negative port of the opamp is equal to b v . The circuit looks like - + a v b v 20 k Ω 160 k Ω 40 k Ω 0 v + 18 V 18 V Note that the dotted line means no current. Using KCL at the node b v 0 0 20 160 ba b vv vv

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op_amp_problem1 - Sample problems Topic Operational...

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