LIGO Document D1001530-v8

aLIGO ISC Whitening Board

Document #:
LIGO-D1001530-v8
Document type:
D - Drawings
Other Versions:
LIGO-D1001530-v7
03 Aug 2020, 17:34
LIGO-D1001530-v5
03 Apr 2014, 11:20
LIGO-D1001530-v4
28 Mar 2012, 09:37
LIGO-D1001530-v3
07 Jan 2011, 17:34
LIGO-D1001530-v1
13 Jun 2010, 21:53
Abstract:
A schematic and associated documents detailing the characteristics of the aLIGO ISC Whitening Module
Files in Document:
Other Files:
Authors:
Keywords:
ISC Whitening
Notes and Changes:
Remove all mention of the OMC DC PD chain (which no longer uses this whitening board). This effectively undoes revisions 6 and 7.

Fix the BOM error in the differential input and replace R15 and R21 that were stuffed with 3kΩ thick film resistors with metal film ones.

Remove the 1uH inductors at the input of the power supply. Together with the bypass capacitors these inductors form a resonant circuit near 10kHz which results in a noise peak at this frequency.

Added a separate solid state switch at the input of the gain and filter stages. This prevents these stages from being over-driven and generating excess noise, when they are bypassed. See https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=84435 for more details.

Parts designators and locations identical to PCBs D2500133-v1 and D2500135-v1.

Related Documents:

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