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 gchrist 21st July 2003 02:09 PM

Balanced Operation

Dear fellows,

I am reading the Balanced line stage article from Pass but I have this question to make:

The circuit does not amplify any portion of the signal which is the same at both inputs. It will only amlify the difference of the two imputs.

Question: The two inputs are with opposite phase. Will the difference between them always be zero? Then what does the circuit amplify?

Thanks
George

 Holger Barske 21st July 2003 02:23 PM

Not the difference is zero, the sum is :nod:
The difference ist what is amplified.
If you would simply subtract both inputs, you would get a result wich has double amplitude of one of the both inputs.

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