Apparatus and method for headroom compensation using dynamic...

Details Apparatus and method for headroom compensation using dynamic... Apparatus and method for headroom compensation using dynamic...

2007-07-17

2007-07-17

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C330S288000

Reexamination Certificate

active

10943367

ABSTRACT:
An output stage circuit may include a sourcing driver device, a nonlinear local feedback loop having a feedback transistor and a first current mirror, a sinking driver device, and an output signal. The output stage circuit may actively and dynamically adjust the transconductance of the sourcing driver device by sensing its region of operation, and by sending a nonlinear feedback signal through the local feedback loop and the first current mirror. The nonlinear local feedback loop may be used for control and headroom compensation of the sourcing driver transistor to provide low distortion operation using a smaller size driver transistor.

REFERENCES:
patent: 5675278 (1997-10-01), Tanaka et al.
patent: 6812768 (2004-11-01), Kawasaki et al.
“Analysis and Design of Analog Integrated Circuits”; Gray et al.; Fourth Edition 2001; pp. 253-254, 260-261.

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