Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2008-05-23
2010-06-08
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S260000
Reexamination Certificate
active
07733181
ABSTRACT:
Methods and corresponding systems for amplifying an input signal include inputting first and second differential input signals into first and second circuit legs, respectively, wherein the first circuit leg includes a first transistor coupled in series with a first variable current source, and wherein the second circuit leg includes a second transistor coupled in series with a second variable current source. The first and second variable current sources are dynamically set to provide first and second bias currents in response to the first and second differential input signals, wherein the first bias current is set inversely proportional to the second bias current. The first and second bias currents are sunk in the first and second circuit legs, respectively. First and second differential output signals are output from the first and second circuit legs, respectively.
REFERENCES:
patent: 5451909 (1995-09-01), Fattaruso
patent: 6642788 (2003-11-01), Abughazaleh et al.
patent: 7259626 (2007-08-01), Zolfaghari
patent: 2002/0036519 (2002-03-01), Krishnapura et al.
patent: 2008/0106336 (2008-05-01), Pera
Connell Lawrence E.
Jaeger Kent
Bethards Charles W.
Freescale Semiconductor Inc.
Nguyen Hieu P
Pascal Robert
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