Offset cancellation in a switching amplifier

Details Offset cancellation in a switching amplifier Offset cancellation in a switching amplifier

2006-11-28

2006-11-28

Lee, Benny (Department: 2817)

Amplifiers

With periodic switching input-output

C327S307000

Reexamination Certificate

active

07142047

ABSTRACT:
A switching circuit is described having an input stage having an input referred offset voltage associated therewith. An output stage has an output offset voltage associated therewith which is due at least in part to the input referred offset associated with the input stage. Offset cancellation circuitry is operable to cancel a portion of the input referred offset voltage before switching of the output stage is enabled thereby resulting in cancellation of the portion of the output offset voltage after switching of the output stage begins. The offset cancellation circuitry is further operable to release the input referred offset voltage after switching of the output stage begins thereby allowing the output offset voltage to drift.

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