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arXiv · 1910.11941

A low-noise resonant input transimpedance amplified photodetector

William Bowden·Alvise Vianello·Richard Hobson
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Abstract

We present the design and characterisation of a low-noise, resonant input transimpedance amplified photodetector. The device operates at a resonance frequency of $90 \,\textrm{MHz}$ and exhibits an input referred current noise of $1.2\,\textrm{pA}/\sqrt{\textrm{Hz}}$---marginally above the the theoretical limit of $1.0\,\textrm{pA}/\sqrt{\textrm{Hz}}$ set by the room temperature Johnson noise of the detector's $16\,\textrm{k}Ω$ transimpedance. As a result, the photodetector allows for shot-noise limited operation for input powers exceeding $14\,μ\textrm{W}$ at $461\,\textrm{nm}$ corresponding to a noise equivalent power of $3.5\,\textrm{pW}/\sqrt{\textrm{Hz}}$. The key design feature which enables this performance is a low-noise, common-source JFET amplifier at the input which helps to reduce the input referred noise contribution of the following amplification stages.

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William Bowden, Alvise Vianello, Richard Hobson. 2019-10-24. A low-noise resonant input transimpedance amplified photodetector. https://doi.org/10.1063/1.5114896

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