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Wednesday, October 21, 2009

Trans-impedance Amplifier Equivalent Circuit

This is an equivalent circuit of a trans-impedance amplifier and a high-impedance source. This is very simple design. This design step sets the DC gain and bias point to ensure proper operation. It also addresses DC offsets. This is the figure of the circuit.


At low frequencies, the op amp’s inverting input is forced to be at ground potential and IS must flow through RF. This combination of effects creates an output voltage of ISRF. At higher frequencies, the capacitors will affect the circuit response. The output capacitance of a current sensor has a strong effect on the stability of the op amp feedback loop. Bode plots are aids in both analyzing this effect and in properly compensating the trans-impedance amplifier using the capacitor (CF). The capacitors also limit the bandwidth of the trans-impedance amplifier.

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