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Entry  Tue Jan 22 19:12:24 2013, tara, Notes, EOM, EOM driver IMG_2209.jpgEOM.pdf
    Reply  Wed Jan 23 19:29:26 2013, tara, Notes, EOM, EOM driver IMG_2213.jpgIMG_2214.JPG
       Reply  Wed Aug 28 20:19:44 2013, tara, Notes, EOM, EOM driver: modification driver1.jpgdriver2.jpgdriver_TF.jpg
Message ID: 1317     Entry time: Wed Aug 28 20:19:44 2013     In reply to: 1092
Author: tara 
Type: Notes 
Category: EOM 
Subject: EOM driver: modification 

We modified the EOM driver, so that the resonant frequency is now~ 14.75MHz. The full test will be done later.

As mentioned in PSL:1311, the resonant frequency on the EOM driver was not at 14.75MHz. Evan and I discussed about how to modify it and decided tof change L4 from 1.4uH to 3 uH, see the schematic here.

 

driver1.jpg

driver2.jpg

above, the driver after the inductor was replaced. The new one has a shield to reduce any magnetic field leakage. The legs are not fit with the footprint on the PCB, so I had to solder it to another wire to reach the footprint.

 

driver_TF.jpg

above: the TF of the driver measured between the drive and the mon output. Red trace shows the TF before the modification. Yellow  trace shows the TF after the modification, notice the peak is at 14.75MHz, the Q is about the same.

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