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Old 17th April 2006, 08:16 PM   #1
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Join Date: Jun 2004
Location: the Netherlands
Default differential design, common mode noise rejection

Dear,

I'm busy with a real differential pre-amp design. In fact four amplifier stages. one plus and one minus per channel.

If I fed a real balanced signaal through those stages, the real common mode happen at the poweramplifier side and not in the pre-amp.

I want to have a common mode already at the input of my pre amplifer. So what to do. I don't want a opamp in the input that's makes the signal unbalanced to make it balanced later. So I was thinking about (for example) a Jensen input tranformer direct after the balanced input, direct followed by the amplifer stages.

Any thoughts?

Beste Regards,
Bas
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