A low-noise resonant input transimpedance amplified photodetector
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 \,MHz and exhibits an input referred current noise of 1.2\,pA/Hz---marginally above the the theoretical limit of 1.0\,pA/Hz set by the room temperature Johnson noise of the detector's 16\,k 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\,pW/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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