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David Ashton
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Re: clarity
David Ashton   10/4/2013 1:23:14 AM
@andy....we're looking forward to seeing yours soon then, to show us how it should be done....

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Andy_I   10/4/2013 1:18:13 AM
Do the people who write these articles ever bother to see what they look like when they get published?

I mean, COME ON, EE Times!  WAKE UP!  This is such a joke.



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A tuned filter?
WKetel   9/28/2013 9:10:24 PM
My first thought would be a tuned LC filter, resonant around 120 Hz. That would have avoided the noise problem and been far more reliable, and a whole lot cheaper.

When I was designing test equipment for factory floor operation we almost always put a Sola Brabd constant voltage transformer ahead of the controls and instrumantation power input. It was always cheaper than even one service call to fix a machine, and it gave us a reputaion for producing very reliable testing machines. The noise on the waveform on the scope traces looks a bit like it comes froman inverter drive circuit for a medium horsepower motor.

Caleb Kraft
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Re: Why so complex?
Caleb Kraft   9/27/2013 11:55:11 AM
that is the funny thing about so many stories involving solving a problem. Someone always comes along with a single sentence that would have probably saved you hours... a long time after the fact.

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Re: Why so complex?
DU00000001   9/27/2013 9:42:33 AM
It's not so easy to create a monster :)

Though the schematics are difficult to read I can identify some R's on the primary side. Thus an adequate C should have done the trick.

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Why so complex?
cjperkins   9/26/2013 3:32:53 PM
Wouldn't a simple RC filter have cleaned up the 60 Hz to get a stable clock?

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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