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Message ID: 1719     Entry time: Wed Jul 8 10:56:04 2009
Author: Stephanie 
Type: Update 
Category: General 
Subject: Multiply Resonant EOM Update 

This week, I've been working on adapting the last week's circuit to make it buildable. Mostly this has involved picking components that are already in the lab, adding tunable components when necessary, and planning roughly how the components should be laid out on a board. I then built the circuit and put it in a box with BNC connectors for easy connection during testing. A picture of the built circuit is attached.

For initial testing, the transformer was removed from the design; since this changed the response of the circuit, I added two resistors to correct the response. A figure showing a schematic of the built circuit is attached. The expected responce of the circuit is also shown; the magnitude (solid) and phase (dashed) of the voltage across the EOM are shown in green, and the impedance of the circuit is shown in blue. While this response has sharp peaks and 50 Ohms (34 dB) of impedance at resonances, the gain is low compared to the circuit with the transformer. This means that, as is, this circuit cannot be used to drive the EOM; it is simply for testing purposes.

Attachment 1: DSC_0566.JPG  2.613 MB  | Hide | Hide all
Attachment 2: InitialBuiltCkt.pdf  41 kB  | Hide | Hide all
Attachment 3: BuiltCkt_ExpectedResponse.png  39 kB  | Hide | Hide all
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