Matched JFETs Improve Photodiode Amplifier (.PDF Download)

Linear Technology has a good application note about using a discrete JFET to improve the ac response of a large-area photodiode. The circuit uses the JFET as a voltage follower on the cathode side of the photodiode (Fig. 1). This nulls the effect of the diode's internal resistance and capacitance. If there’s no voltage change across

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