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 Wed Nov 23 17:48:16 2016, rana, koji, Update, IOO, How bad is the McWFS?
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 Sat Nov 26 19:16:28 2016, Koji, Update, IOO, IMC WFS Demod board measurement & analysis 
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Tue Nov 29 17:45:06 2016, Koji, Update, IOO, IMC WFS Demod board measurement & analysis
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Tue Nov 29 18:35:32 2016, rana, Update, IOO, IMC WFS Demod board measurement & analysis
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Fri Dec 2 18:02:37 2016, Koji, Update, IOO, IMC WFS Demod board measurement & analysis
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Sat Dec 3 13:27:35 2016, Koji, Update, IOO, IMC WFS Demod board measurement & analysis
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Tue Dec 6 13:37:02 2016, Koji, Update, IOO, IMC WFS Demod board measurement & analysis
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Tue Dec 6 16:47:40 2016, Koji, Update, IOO, IMC WFS whitening filter investigation
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Tue Dec 6 17:54:08 2016, Koji, Update, IOO, IMC WFS whitening filter investigation
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Tue Dec 6 22:41:49 2016, Koji, Update, IOO, IMC WFS whitening filter investigation
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Tue Dec 13 17:26:42 2016, Koji, Update, IOO, IMC WFS whitening filter investigation
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Thu Dec 15 03:46:19 2016, rana, Update, IOO, IMC WFS whitening filter investigation
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Message ID: 12669
Entry time: Tue Dec 6 16:47:40 2016
In reply to: 12668
Reply to this: 12670
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| Author: |
Koji |
| Type: |
Update |
| Category: |
IOO |
| Subject: |
IMC WFS whitening filter investigation |
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The whitening board saids it is Rev B, but the actual component values are more like Rev. C.
The input stage (AD602) has an input resistor of 909 Ohm.
This is causing a big attenuation of the signal (x1/10) because the input impedance of AD602 is not high. And this screws up the logarithm of the gain.
I don't think this is a right approach. |
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