This fast photodiode transimpedance amplifier is based on a high- speed JFET- input op amp OPA657. This op amp is compensated for a minimum closed- loop gain of 7V/V but the capacitance of the photodiode plus the op amp input capacitance together with the feedback resistor R1 provides a noise gain at high frequency that allows stable operation. Compensation capacitor C1 optimizes the amplifier bandwidth / gain peaking tradeoff. Achieving this level of performance requires very careful layout and the circuit must be shielded to prevent noise pickup. (Circuit is created by Neil P. Albaugh, TI- Tucson)
Transimpedance amplifier circuit:
Online Simulation a Transimpedance Amplifier Circuit
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