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Interfacing the ADL5317 High-Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector Application

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Interfacing the ADL5317 High-Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector Application

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The ADL5317 is primarily designed for wide dynamic range applications that simplify APD bias circuit architecture. Accurate control of the bias voltage across the APD becomes critical to maintain the proper avalanche multiplication factor when the temperature and input power vary. In this application, the ADL5317 operates in linear mode. The bias voltage to the APD, delivered at the VAPD pin, is controlled by the voltage (VSET) at the VSET pin. The bias voltage at VAPD is equal to 30 x VSET.

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