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AEL (General)
yutaro.enomoto - 19:24 Wednesday 01 August 2018 (5671) Print this report
Modification of a Common Mode Servo

Based on JGW-G1808482, I modified some circuit componets of S1605812 to change pole/zero frequencies, to be used for PLL of green lock. 

Here is the list of changes:
C118: 100n --> 1000n
C119: 100n --> 1000n
C120: 100n --> 1000n
R72: 1.5K --> omit
R74: 1.5K --> 8.06K
R76: 4.99K --> 8.06K
R77: 82 --> 15K
R79: 374 --> 82

Thanks to this modification, currently the 1st, 2nd, and 3rd boosts are 0Hz/10Hz pole/zero, 20Hz/2kHz pole/zero, and 20Hz/2kHz pole/zero, respectively.
I confirmed they are working properly, by plugging the slow output into IN1 to close the loop in order to avoid the saturation since 1st boost would otherwise saturate the circuit.

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