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Entry  Wed Jan 20 18:07:09 2021, Anchal, Summary, BHD, HAM-A Coil Driver measurements before modifications 7x
    Reply  Mon Jan 25 18:18:04 2021, Anchal, Summary, BHD, Satellite Amplifier Transfer Functions and noise D1002818_S2100029_TFandNoiseSpectrum.pdfD1002818_Testing.zip
       Reply  Wed Feb 3 16:27:19 2021, Anchal, Summary, BHD, Satellite Amplifier Transfer Functions and noise After modifications D1002818_S2100029_TFAfterChanges.pdfD1002818_S2100029_OutputNoiseSpecAfterChanges.pdfD1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdfD1002812_S2100029_After_Modifications_Feb3.jpgAfterChanges.zip
          Reply  Wed Feb 10 11:45:59 2021, Anchal, Summary, BHD, Satellite Amplifier Very Low frequency noise After modifications 6x
             Reply  Wed Feb 10 15:07:50 2021, Anchal, Summary, BHD, Satellite Amplifier Output Offset measurements 
                Reply  Wed Feb 10 15:25:45 2021, gautam, Summary, BHD, Satellite Amplifier Output Offset measurements 
                   Reply  Wed Feb 10 17:18:03 2021, Koji, Summary, BHD, Satellite Amplifier Output Offset measurements 
             Reply  Thu Feb 11 11:10:05 2021, Anchal, Summary, BHD, Satellite Amplifier Very Low frequency noise After modifications AfterChangesSpectrum_AC.zipD1002818_S2100029_OutputNoiseSpecAfterChanges.pdfD1002818_S2100029_InputRefCurrentNoiseSpecAfterChanges.pdfD1002818_S2100029_InputRefDispNoiseSpecAfterChanges.pdf
                Reply  Thu Feb 11 16:58:52 2021, rana, Summary, BHD, Satellite Amplifier Very Low frequency noise After modifications 
    Reply  Thu Jan 28 12:53:14 2021, Anchal, Summary, BHD, HAM-A Coil Driver measurements before modifications D1100117_S2100027_Current_Noise_Spectrum.pdfD1100117_S2100027_Voltage_Noise_Spectrum.pdfD1100117_S2100028_Current_Noise_Spectrum.pdfD1100117_S2100028_Voltage_Noise_Spectrum.pdfSpectrumMeasurement.zip
       Reply  Thu Jan 28 18:04:55 2021, Anchal, Summary, BHD, HAM-A Coil Driver measurements After modifications D1100117_S2100027_TF.pdfAfterChanges.zip
          Reply  Thu Jan 28 21:44:45 2021, gautam, Summary, BHD, HAM-A Coil Driver measurements After modifications 
             Reply  Fri Jan 29 15:39:30 2021, Anchal, Summary, BHD, HAM-A Coil Driver measurements After modifications TF and Noise S2100027 D1100687_S2100027_After_Modifications_Jan28.jpgD1100117_S2100027_TF.pdfD1100117_S2100027_Voltage_Noise_Spectrum.pdfD1100117_S2100027_Current_Noise_Spectrum.pdfAfterChanges.zip
                Reply  Tue Feb 2 11:57:46 2021, Anchal, Summary, BHD, HAM-A Coil Driver measurements After modifications TF and Noise S2100028 D1100687_S2100028_After_Modifications_Feb01_2021.jpgD1100117_S2100028_TF.pdfD1100117_S2100028_Voltage_Noise_Spectrum.pdfD1100117_S2100028_Current_Noise_Spectrum.pdfAfterChanges.zip
Message ID: 15793     Entry time: Wed Feb 3 16:27:19 2021     In reply to: 15776     Reply to this: 15797
Author: Anchal 
Type: Summary 
Category: BHD 
Subject: Satellite Amplifier Transfer Functions and noise After modifications 

I have made modifications recommended in this doc. The changes made are:

  • R24: 19.6k to 4.99k Ohms
  • R20: 19.6k to 4.99k Ohms
  • R23: 787 to 499 Ohms
  • Removed C16.

I took transfer function measurements, fitted them with zeros and poles and plotted it against the zero model of the circuit. The zeros and poles we intended to shift are matching well with 3Hz zero and 30 Hz pole. The later pole at 1500 Hz is at a higher value from what is predicted by zero.

I also took noise measurements and they are in good agreement with the noise predicted by zero.

Edit Wed Feb 10 15:14:13 2021 :

THE NOISE MEASUREMENT WAS WRONG HERE. SEE 40m/15799.

Attachment 1: D1002818_S2100029_TFAfterChanges.pdf  122 kB  | Hide | Hide all
D1002818_S2100029_TFAfterChanges.pdf D1002818_S2100029_TFAfterChanges.pdf D1002818_S2100029_TFAfterChanges.pdf D1002818_S2100029_TFAfterChanges.pdf D1002818_S2100029_TFAfterChanges.pdf D1002818_S2100029_TFAfterChanges.pdf D1002818_S2100029_TFAfterChanges.pdf D1002818_S2100029_TFAfterChanges.pdf
Attachment 2: D1002818_S2100029_OutputNoiseSpecAfterChanges.pdf  332 kB  | Hide | Hide all
D1002818_S2100029_OutputNoiseSpecAfterChanges.pdf D1002818_S2100029_OutputNoiseSpecAfterChanges.pdf D1002818_S2100029_OutputNoiseSpecAfterChanges.pdf D1002818_S2100029_OutputNoiseSpecAfterChanges.pdf D1002818_S2100029_OutputNoiseSpecAfterChanges.pdf D1002818_S2100029_OutputNoiseSpecAfterChanges.pdf D1002818_S2100029_OutputNoiseSpecAfterChanges.pdf D1002818_S2100029_OutputNoiseSpecAfterChanges.pdf
Attachment 3: D1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdf  244 kB  | Hide | Hide all
D1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdf D1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdf D1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdf D1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdf D1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdf D1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdf D1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdf D1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdf
Attachment 4: D1002812_S2100029_After_Modifications_Feb3.jpg  1.445 MB  | Hide | Hide all
D1002812_S2100029_After_Modifications_Feb3.jpg
Attachment 5: AfterChanges.zip  8.526 MB
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