Home > 1.ANALOG, Others > Common-Mode Feedback

Common-Mode Feedback

Why do we need to use Common-Mode Feedback Circuits ?

• In the past, circuits have mainly one input and one output and both

referred to ground.

• Low voltage power supply make single ended circuits very difficult

to perform optimally. An alternative to single-ended circuits is to

use fully differential circuits.

• To double the output swing a fully differential circuit are used.

• The output terminals of fully differential circuits are equal and

opposite polarity.

• Additional properties of fully differential circuits are: improved

output swing, linearity and common-mode rejection ratio.

• How are the differential outputs referred to ?

• How are the common-mode signals eliminated in a Fully differential

circuit ?

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Categories: 1.ANALOG, Others
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