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Message ID: 2392     Entry time: Tue Aug 13 17:12:47 2019
Author: ScottA 
Type: DailyProgress 
Category: RFAM 
Subject: Power Sweep with Different Resistors for R5 in EOM Driver 

I investigated the possibility of increasing the EOM Drivers gain by replacing the R5 resistor with a different value, as this should be what effects the gain of a common base amplifier.

  • I set up the SN06 driver with the Bias tee and Dummy EOM and took power sweeps from -5 dBm to 15 dBm for the already existing 2.87K ohm resistor value, as well as with 680 ohm and 10k ohm resistors.
  • I used a 680 ohm and 10k ohm resistor because we want a Vpp of around 20V to reach the desired modulation depth while we only reach 6V, so I increased and decreased the resistance by about a factor of 4 to see the change.
  • Our theory was a lower resistor would yield a higher gain value, but as we can see neither configuration of new resistances was better than the already existing 2.87K ohm.

It seems we cannot use this method to increase the gain of the driver.

Attachment 1: Power_sweep_w_different_resistors_for_R5_EOM_driver.zip  87 kB  Uploaded Tue Aug 13 18:51:03 2019
Attachment 2: Power_Sweep_SN06_withBias_DumEOM_diff_resistors_in_R5.pdf  25 kB  Uploaded Tue Aug 13 18:51:16 2019  | Hide | Hide all
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