Ultra Low Noise Preamplifier

Document #:

LIGO-D1200660-v1

Document type:

D - Drawings

Abstract:

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.

Files in Document:

• PDF of Schematic and Layout (pnp_LNA.pdf, 217.7 kB)

Other Files:

• Altium Project Files (zipped) (pnp_LNA (4-27-2012 1-52-02 PM).zip, 122.5 kB)
• Gerber data for PCB Manufacture (LNA_v1.zip, 57.1 kB)

ICS/JIRA Record:

• ICS_LINK

Topics:

• Basic R&D
• System Engineering

Authors:

• Rich Abbott

Keywords:

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