Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Reexamination Certificate
2005-09-13
2005-09-13
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
C330S286000, C330S302000
Reexamination Certificate
active
06943631
ABSTRACT:
A resistive level-shifting biasing network is used with a capacitor in parallel to couple FET-based amplifier stages from DC to several GHz in a multi-stage amplifier. The output of the first amplifier stage is connected to the input of the second amplifier stage without a blocking capacitor or level-shifting diodes, allowing a portion of the drain current for the first amplifier stage to be supplied from the second amplifier stage. In a particular embodiment, a distributed amplifier achieved over 20 dB gain from DC to about 80 GHz using three traveling wave amplifier chips.
REFERENCES:
patent: 6236266 (2001-05-01), Choumei et al.
patent: 6278328 (2001-08-01), Yamamoto et al.
patent: 6329879 (2001-12-01), Maruyama et al.
Breitbarth Jason R.
Culver Morgan K.
D'Avanzo, Jr. Donald C.
Scherrer Daniel R.
Schmelzer David P.
Agilent Technologie,s Inc.
Mottola Steven J.
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