Low voltage broadband gain cell

Details Low voltage broadband gain cell Low voltage broadband gain cell

2007-01-30

2007-01-30

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S311000, C330S258000

Reexamination Certificate

active

10946738

ABSTRACT:
T-coil structures are used in one embodiment to inject programmably-variable amounts of transistor biasing currents into the respective drains of current sinking transistor means of a broadband differential amplifier such that, when the differential amplifier is in common mode, total transistor drain current will exceed total voltage-dropping current passing through corresponding voltage-dropping resistances of the amplifier's transistor means. The T-coil structures keep the parasitic capacitances of the programmable current sources that provide the bias currents de-lumped from capacitances of the amplifier's output nodes and/or capacitances of the amplifier's voltage-dropping resistances (variable resistances) to thereby maintain a wide bandwidth.

REFERENCES:
patent: 6023192 (2000-02-01), Didier
patent: 6236268 (2001-05-01), Ridgers
patent: 6504432 (2003-01-01), Rokhsaz
patent: 6529075 (2003-03-01), Bruck et al.
patent: 6545502 (2003-04-01), Dasgupta et al.
patent: 6639468 (2003-10-01), Belot
patent: 6717467 (2004-04-01), Renous et al.
patent: 6809591 (2004-10-01), Ohashi
patent: 2006/0091954 (2006-05-01), Darabi

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