Created by
Created March 14, 2013
Last modified March 14, 2013
Tags ligo   lsc   photodetector   rf  


RF Photodetector Schematic.


RF Photodetector schematic for the Advanced LIGO length sensing and control.

This photodetector does the readout at 9 & 45 MHz, while rejecting signals at the intermodulation harmonics.

Input referred shot noise equivalent DC current is less than 2 mA in both channels.

The DC circuit show here is intentionally simplified. The actual one has a high current buffer and a follow on lead filter to provide high frequency signal amplification.


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