ADA4051-2

Rev. 0 | Page 17 of 20

OUTPUT PHASE REVERSAL

Output phase reversal occurs in some amplifiers when the input

common-mode voltage range is exceeded. As a common-mode

voltage moves outside the common-mode range, the outputs

of these amplifiers can suddenly jump in the opposite direction

to the supply rail. This usually occurs when one of the internal

stages of the amplifier no longer has sufficient bias voltage

across it and subsequently turns off.

The ADA4051-2 amplifier has been carefully designed to

prevent any output phase reversal, provided both inputs are

maintained approximately within 0.3 V above and below the

an internal loop opens and the output remains in saturation

mode, without phase reversal, until the input voltage is brought

back to within the input voltage range limits as is shown in

Figure 52 and Figure 55.