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Ideal CMFB specification

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artho

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Hi,

I want to design a fully differential op amp with a ideal CMFB. What is the gain and other specs that the CMFB amplifier have to be? And, as i'm using resistor divider to obtain the common-mode voltage, what is de ideal value of these resistors? I know that they have to be higher than the output impedance of the amplifier, but how high?
Thanks.
 

artho said:
I know that they have to be higher than the output impedance of the amplifier, but how high?
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High enough as not to load the diff amp outputs unnecessarily. I'd say at least a factor of 5 .. 10 higher than its output impedance.
 

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