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Entry  Fri Jun 20 11:41:18 2014, Nichin, Update, Electronics, Transimpedence measurement-BBPD BBPD_readings_06-19-2014.zipBBPD_transimpedence_19thJune2014.pdf
    Reply  Fri Jun 20 19:09:23 2014, Koji, Update, Electronics, Transimpedence measurement-BBPD 
       Reply  Mon Jun 23 21:16:14 2014, Nichin, Update, Electronics, Transimpedence measurement-BBPD BBPD_transimpedence_06-23-2014.pdfBBPD_readings_06-23-2014.zip
Message ID: 10079     Entry time: Fri Jun 20 11:41:18 2014     Reply to this: 10085
Author: Nichin 
Type: Update 
Category: Electronics 
Subject: Transimpedence measurement-BBPD 

EDIT: Please ignore the following data. The revised data and plot are in Elog 10089 

Yesterday evening, I conducted the same measurements done in Elog-10059 using the same REF PD (NF 1611) and the same model of BBPD, but on different piece that needed to be checked. 

I moved the NA from near rack 1Y1 to the Jenne laser table and back again after the readings were done.

 Acquiring data

  • The following conditions were set on Network Analyzer Agilent 4395:

1) Frequency sweep range: 1MHz to 300 MHz.

2) Number of Points sampled in  the range: 201

3) Type of sweep: Logarithmic

  • Set the NA to give the corresponding transfer function value (output of BBPD over output of 1611) and also Phase response in degrees.
  • Save the data into floppy disk for processing on the computer.


The Plots of transimpedence obtained are attached. The data and matlab code used is in the zip file.

The transimpedance of  Broadband photodiode (D1002969-v8) was around 50kV/A-70kV/A (Unusually high) for most of the range (2), but the value started falling as the frequency approached 200 MHz.


The high impedance might be because the PD is faulty.   





Attachment 1: BBPD_readings_06-19-2014.zip  4 kB
Attachment 2: BBPD_transimpedence_19thJune2014.pdf  6 kB  Uploaded Mon Jun 23 11:21:30 2014  | Show | Show all
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