REFL165

Modification history

• Oct/2011 prepared by KA
• Oct/2011 characterization by KA

  • 40m elog #5671

• Mar/2012 repaired and characterized by SD

  • 40m elog #6333

Schematics

• schematic and the results of the characterizations in PDF

Characteristics

• DC output / transimpedance: 50 V/A
• RF output / transimpedance: 12.5 kV/A (on a 50 Ohm load)
• RF ouput / shotnoise intercept current: 1.45 mA

LISO fitting code

• REFL165_LISO.fil

  • # basic manual fitting
    zero 216.9164194376k  ### fitted (name = zero0)
    zero 3.2000181779M 3.3201166694  ### fitted (name = zero1)
    zero 603.0023735723M 12.4948023672  ### fitted (name = zero2)
    
    # pole+zero pairs for finer fitting
    zero 176.0561002533M 1.0171946950  ### fitted (name = zero3)
    zero 1.4696992948M 405.7934822619m  ### fitted (name = zero4)
    
    # basic manual fitting
    pole 684.7282048907k 1.2781666253  ### fitted (name = pole0)
    pole 165.4450171427M 54.3874095177  ### fitted (name = pole1)
    
    # pole+zero pairs for finer fitting
    pole 208.8050567387M 1.1581153281  ### fitted (name = pole2)
    pole 1.3538031841M 349.3143756987m  ### fitted (name = pole3)
    
    # Gain and time delay in the loop
    factor 9.1302650020  ### fitted
    delay 2.0727760572n  ### fitted
    
    param zero0:f 1k 1M
    param zero1:f 2M 5M
    param zero1:q  0.1 100
    param zero2:f 200M 10G
    param zero2:q  0.1 10000
    param zero3:f 170M 1G
    param zero3:q  0.1 1000
    param zero4:f 800k 3M
    param zero4:q  0 100
    
    param pole0:f 0.5M 1M
    param pole0:q  0.1 10
    param pole1:f 150M 200M
    param pole1:q  0 1G
    param pole2:f 200M 1G
    param pole2:q  0.1 1000
    param pole3:f 100k 3M
    param pole3:q  0 100
    
    param factor 1p 1M
    param delay 1p 10m
    
    fit REFL165.bod absdeg rel
    rewrite samebetter
    gnuterm pdf
    freq log 0.3e6 500M 1000 ### from data file

REFL165 svn repository with all data and fits

• REFL165_svn

Some pictures

The first picture shown below is of the damaged photo diode (Feb/2012).

The second picture shows the new PD after the replacement.