Low noise amplifiers for small and large area photodiodes
Glen Brisebois
Abstract
Low noise amplifiers for small and large area photodiodes are discussed.
Keywords
Low noise amplifier
photodiode amplifier
LTC6244
Introduction
Photodiodes can be broken into two categories: large area photodiodes with their attendant high capacitance (30pF to 3000pF) and smaller area photodiodes with relatively low capacitance (10pF or less). For optimal signal-to-noise performance, a transimpedance amplifier consisting of an inverting op amp and a feedback resistor is most commonly used to convert the photodiode current into voltage. In low noise amplifier design, large area photodiode amplifiers require more attention to reducing op amp ...
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