DIO2140

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DIO2140• Rev. 1.5

Block Diagram

Application Information

Fully Differential Amplifier

The DIO2140 is a fully differential amplifier with differential inputs and outputs. The fully differential amplifier

consists of a differential amplifier and a common-mode amplifier. The differential amplifier ensures that the

amplifier outputs a differential voltage that is equal to the differential input times the gain. The common-mode

feedback ensures that the common-mode voltage at the output is biased around VDD/2 regardless of the

common-mode voltage at the input. The fully differential DIO2140 can still be used with a single-ended input;

however, the DIO2140 should be used with differential inputs when the device in a noisy environment, like a

wireless handset, to ensure maximum noise rejection.

Advantages of Fully Differential Amplifiers

-Output-coupling capacitors are not required

-Mid-supply bypass capacitor not required

-Better RF-immunity