We present the design and characterization of a low-noise, resonant input transimpedance amplified photodetector. The device operates at a resonance frequency of 90 MHz and exhibits an input referred current noise of 1.2 —marginally above the theoretical limit of 1.0 set by the room temperature Johnson noise of the detector’s 16 kΩ transimpedance. As a result, the photodetector allows for shot-noise limited operation for input powers exceeding 14 µW at 461 nm corresponding to a noise equivalent power of 3.5 . The key design feature which enables this performance is a low-noise, common-source junction gate field-effect transistor amplifier at the input which helps to reduce the input referred noise contribution of the following amplification stages.
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Brief Report| October 22 2019
A low-noise resonant input transimpedance amplified photodetector
A. Vianello ;
W. Bowden, A. Vianello, R. Hobson; A low-noise resonant input transimpedance amplified photodetector. Rev. Sci. Instrum. 1 October 2019; 90 (10): 106106. https://doi.org/10.1063/1.5114896
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