Offset calibration and precision hysteresis for a rail-rail...

Details Offset calibration and precision hysteresis for a rail-rail... Offset calibration and precision hysteresis for a rail-rail...

2011-07-05

2011-07-05

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S065000

Reexamination Certificate

active

07973569

ABSTRACT:
A rail-rail comparator having an input stage with independent positive and negative differential voltage offset compensation tracks changes in Gm (transconductance) of the input stage. By tracking the changes in Gm (transconductance) of the input stage, hysteresis of the rail-rail comparator becomes insensitive to the input common mode voltage. A two-stage rail-rail comparator may be used for adding hysteresis to a second stage. The first stage of the two-stage rail-rail comparator operates at substantially unity gain. The second stage of the two-stage rail-rail comparator operates as a regular high gain amplifier with hysteresis. Additional circuitry tracks the Gm (transconductance) change of the first stage to make the second stage hysteresis insensitive to the input common mode voltage at the first stage. This also makes it easier to create a programmable hysteresis that is accurate over all input voltage values.

REFERENCES:
patent: 4874969 (1989-10-01), Meadows
patent: 6970022 (2005-11-01), Miller
patent: 7292083 (2007-11-01), Wang et al.

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