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Entry  Fri Aug 3 15:53:25 2018, gautam, Update, SUS, Low noise bias path idea LT1055_precOpAmp.pdf
    Reply  Fri Aug 3 16:27:40 2018, rana, Update, SUS, Low noise bias path idea 
       Reply  Sun Aug 5 15:43:50 2018, gautam, Update, SUS, Another low noise bias path idea HV_Bias_schematic.pdfTF.pdfbias.pdfHVbias_currentNoise.pdf
          Reply  Wed Aug 8 23:06:59 2018, gautam, Update, SUS, Another low noise bias path idea 
             Reply  Wed Aug 15 19:18:07 2018, gautam, Update, SUS, Another low noise bias path idea HV_Bias.pdfHVamp_TF.pdfHVamp_noises.pdfcurrentNoises.pdfHVamp.fil.zip
                Reply  Thu Aug 16 23:06:50 2018, gautam, Update, SUS, Another low noise bias path idea HVamp_schem.PDFHvamp.zip
                   Reply  Mon Oct 1 22:20:42 2018, gautam, Update, SUS, Prototyping HV Bias Circuit CoilDriverBias.pdfcurrentNoise.pdfPSRR.pdf
Message ID: 14165     Entry time: Wed Aug 15 19:18:07 2018     In reply to: 14147     Reply to this: 14169
Author: gautam 
Type: Update 
Category: SUS 
Subject: Another low noise bias path idea 

I took another pass at this. Here is what I have now:

Attachment #1: Composite amplifier design to suppress voltage noise of PA91 at low frequencies.

Attachment #2: Transfer function from input to output.

Attachment #3: Top 5 voltage noise contributions for this topology.

Attachment #4: Current noises for this topology, comparison to current noise from fast path and slow DAC noise.

Attachment #5: LISO file for this topology.

Looks like this will do the job. I'm going to run this by Rich and get his input on whether this will work (this design has a few differences from Rich's design), and also on how to best protect from HV incidents.

Attachment 1: HV_Bias.pdf  62 kB  Uploaded Wed Aug 15 20:18:33 2018  | Hide | Hide all
HV_Bias.pdf
Attachment 2: HVamp_TF.pdf  143 kB  Uploaded Wed Aug 15 20:21:44 2018  | Hide | Hide all
HVamp_TF.pdf
Attachment 3: HVamp_noises.pdf  153 kB  Uploaded Wed Aug 15 20:21:56 2018  | Hide | Hide all
HVamp_noises.pdf
Attachment 4: currentNoises.pdf  176 kB  Uploaded Wed Aug 15 20:22:04 2018  | Hide | Hide all
currentNoises.pdf
Attachment 5: HVamp.fil.zip  501 Bytes  Uploaded Wed Aug 15 20:23:01 2018
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