Proportional-integral response for control systems can be generated by a simple analog circuit. Feedback components R2, C2, & C1 together with input resistor R1 control the frequency response of U1. R3 is added to the circuit to provide feedback in a DC analysis and it is not necessary in an actual circuit. For stability, the control loop dominant pole should be formed by this integrator. (Circuit is created by Neil P. Albaugh, TI-Tucson)
PI Temperature Control Integrator circuit:
Online Simulation of a PI Temperature Control Integrator Circuit
The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.
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