Explain the Circuit Analysis and Output voltage of an OP-Amp Integrator

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1. Circuit Analysis: Since point A in Fig. 9.80 is at virtual ground, the virtual-ground equivalent circuit of operational integrator will be as shown in Fig. 9.81. Because of virtual ground and infinite impedance of the OP-amp, all of the input current i flows through the capacitor i.e. i = i_c.

2. Output voltage: If a fixed voltage is applied to the input of an integrator, eq. (iv) shows that the output voltage grows over a period of time, providing a ramp voltage. Eq. (iv) also shows that the output voltage ramp (for a fixed input voltage) is opposite in polarity to the input voltage and is multiplied by the factor 1/RC. As an example, consider an input voltage v1 = 1V to the integrator circuit of Fig. 9.11 (i). The scale factor of 1/RC is

Wilfykil answered the question on August 16, 2019 at 11:54

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