Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-01-09
2007-01-09
Nguyen, Khanh V. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S311000
Reexamination Certificate
active
10739781
ABSTRACT:
A differential cascode amplifier has first and second cascode circuits, driven by two differential signal sources including input resistances.The first cascode circuit includes a first input transistor having a first collector, a first emitter, and a first base, and a first output transistor having a second collector, a second base, and a second emitter coupled to the first collector. The second cascode circuit includes a second input transistor having a third collector, a third emitter, and a third base, and a second output transistor having a fourth collector, a fourth base, and a fourth emitter coupled to the third collector. The amplifier has a first connection connecting the first base to the fourth base, and a second connection connecting the second base to the third base.This cross-connected differential cascode architecture provides doubled output bandwidth and current gain (in dB), further increasing input impedance and output swing.
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Boreysha Liby
Bruck Yuri
Burdo Gennady
Zelikson Michael
International Business Machines - Corporation
Kaufman Stephen C.
Nguyen Khanh V.
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