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High-Side Transimpedance Amplifier & APD Monitor

High-Side Transimpedance Amplifier & APD Monitor

Current through a photodiode with a large reverse bias potential is converted to a ground referenced output voltage directly through an LTC6101. The supply rail can be as high as 70V. Gain of the I to V conversion, the trans- impedance, is set by the selection of resistor RL.