LIGO Document D1200660-v1

Ultra Low Noise Preamplifier

Document #:
Document type:
D - Drawings
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This amplifier is based on an Analog Devices Inc. application note as shown in the SSM2220 datasheet, and a design completed by F. Seifert in 2007.

The amplifier has an input referred noise of ~0.3nV/rtHz, and is suitable for low source impedance ( ~1k ohm) applications such as the TCS ISS HgCdTe photodiode.

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amplifier low noise
Notes and Changes:
Looking at this design with fresh eyes, it looks as though Q1 is put in backwards (flipped emitter and collector). Also some of the component values look a bit suspect. R2 should be smaller like around 82 ohms, and R11 should be 150 ohms with 0.01uF for C5

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