A low-noise resonant input transimpedance amplified photodetector
Abstract
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 p A /√{H z }—marginally above the theoretical limit of 1.0 p A /√{H z } 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 p W /√{H z }. 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.
- Publication:
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Review of Scientific Instruments
- Pub Date:
- October 2019
- DOI:
- 10.1063/1.5114896
- arXiv:
- arXiv:1910.11941
- Bibcode:
- 2019RScI...90j6106B
- Keywords:
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- Physics - Instrumentation and Detectors
- E-Print:
- Published in Review of Scientific Instruments