CFL RFPD 6.25MHz

Document #:: LIGO-S1900052-v5
Document type:: S - Serial numbers

Other Versions:

LIGO-S1900052-v6
16 Sep 2022, 21:16

Abstract:: A modified CLF RFPD 6.25MHZ photo-detector circuit using PCB D1101124 and chassis D1101176. This circuit includes a manufactured coil using micro-metals core T25-6 AL=2.7, final inductance 5.976uH. Calculated series resistance 8.75ohms and Photodiode parameters are C=108pF, Fc=6.25MHz, Q=26.824. Measured noise is -128.8dBm/Hz. Calculated noise equivalent photocurrent is 20.8x10-6/Hz
Upon receipt at LHO, this unit was modified slightly (see eTraveler) and the shot noise equivalent photocurrent (SNEP) was remeasured to be 10.5uA (Fc = 6.25MHz, Q = 27.65, Output Noise = -131.5 dBm/Hz, L = 5.98uH)

Files in Document:

E-Traveler (S1900052.44184cb74d26c47c023f32df9c70e3b0d7507eb5, 1.4 kB)

Other Files:

Test Results PDF (Test Results_S1900052.pdf, 88.1 kB)
Test Results Word (Test Results_S1900052.doc, 59.5 kB)

Topics:

Authors:

Notes and Changes:

CFL RFPD LT6202

This unit was send to LHO on 2-26-19

This units was modify at LLO, R1 was replaced by a 10Kohms, and L7 was moved and the leads were cut. C26 was added to the circuit to help on the adjustment of resonant frequency. The final current noise was around 10x10-6Amp/Hz 03-05-2019

Related Documents:

LIGO Document S1900052-v5

CFL RFPD 6.25MHz