Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Reexamination Certificate
2005-03-15
2005-03-15
Nguyen, Long (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
C327S562000, C327S563000, C330S258000
Reexamination Certificate
active
06867643
ABSTRACT:
A rail-to-rail operational amplifier to extract a true mean of two signals. The amplifier includes a first amplifier input stage adapted to operate when a mean of the two signals is near an upper rail voltage. A second amplifier input stage is adapted to operate when the mean of the two signals is near a lower rail voltage. A transitioning circuit is adapted to control how much each of the first and the second amplifier input stages contributes to an input of a high-gain amplifier output stage. An output of the high-gain amplifier output stage is fed back to both the n-type amplifier input stage and the p-type amplifier input stage via a matched buffer stage.
REFERENCES:
patent: 4797631 (1989-01-01), Hsu et al.
patent: 6150883 (2000-11-01), Ivanov
patent: 6356153 (2002-03-01), Ivanov et al.
patent: 20020084838 (2002-07-01), Martin et al.
Elantec Semiconductor Inc.
Fliesler & Meyer LLP
Nguyen Long
LandOfFree
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