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Subject: Re: Adding a DC bias to a differential clock signal

Date: 04/15/02 at 7:19 AM
Posted by: David Ashby
E-mail: dashby@quin.co.uk
Message Posted:

In Reply to: Re: Adding a DC bias to a differential clock signal posted by Mario Santos on 04/10/02 at 9:05 AM:

Hi Mario,

It sounds like your signal is 10Base-T ethernet, being Manchester encoded @ 10MHz clock. You should be able to couple this via a transformer or capacitor network since the Manchester encoding scheme avoids the need to transmit a D.C. high or low level.

There are signal transformers available for this type of application from companies such as Halo, Technitrol, Bel, YCL, and Pulse. I'd try to look for applications notes on their websites. The 120V to 7.8V transformer is probably a low frequency power transformer that would be unsuitable for coupling your data signal.

But given the correct type of transformer, Yes,you should be able to combine the signal transformer with a potential divider network (resistors) to obtain the 1.65V bias from the 7.8V d.c. supply.

Hope this helps

David Ashby


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