Comparator with sensitivity control

Details Comparator with sensitivity control Comparator with sensitivity control

2011-01-11

2011-01-11

Kinkead, Arnold (Department: 2817)

Demodulators

Amplitude modulation demodulator

C329S349000, C341S126000, C341S135000, C327S067000, C327S205000

Reexamination Certificate

active

07868690

ABSTRACT:
A comparator has a differential input stage, a current source coupled to the differential input stage for providing a tail current to one side of the differential input stage, and a differential load coupled to the differential pair and having at least one diode coupled load transistor per differential side. A load current through either one of the at least one diode coupled load transistor on either differential side is mirrored with a current mirror configuration to provide a current be fed to a respective node, each node being coupled to a respective variable biasing current source and a respective other side of the differential input stage, so as to provide a variable positive feedback to the differential input stage.

REFERENCES:
patent: 6894542 (2005-05-01), Prexl et al.
patent: 7579906 (2009-08-01), Kumar et al.
patent: 2006/0002429 (2006-01-01), Doddamane et al.
patent: 102004009037 (2005-06-01), None

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