Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-03-10
2009-06-23
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
Reexamination Certificate
active
07551029
ABSTRACT:
A transconductance stage providing gain control includes an input stage to convert a first differential input voltage and a second differential input voltage to a first intermediate current and a second intermediate current, respectively. An output stage generates a first output current signal and a second output current signal based on the first and second intermediate currents, respectively. The output stage includes a first plurality of output transistors coupled to a first plurality of corresponding switch resistors and a second plurality of output transistors coupled to a second plurality of corresponding switch resistors. The number of activated switch resistors of the first plurality of switch resistors determines a gain of the first output current signal and a number of activated switch resistors of the second plurality of switch resistors determines a gain of the second output current signal.
REFERENCES:
patent: 6462527 (2002-10-01), Maneatis
patent: 6980054 (2005-12-01), Okada
patent: 7078968 (2006-07-01), Gaeta et al.
patent: 7088180 (2006-08-01), Lee et al.
patent: 7203511 (2007-04-01), Trachewsky et al.
patent: 2006/0097792 (2006-05-01), Ryu et al.
Broadcom Corporation
Pascal Robert
Sterne Kessler Goldstein & Fox P.L.L.C.
Wong Alan
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