Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Reexamination Certificate
2009-04-09
2010-06-15
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
C330S296000, C330S253000
Reexamination Certificate
active
07737790
ABSTRACT:
A cascode amplifier includes a first transistor, a second transistor, a third transistor, a fourth transistor and a bias circuit. Each of the transistors has a gate electrode, a first electrode and a second electrode, a first electrode of the first transistor is coupled to a second electrode of the second transistor, a first electrode of the third transistor is coupled to a second electrode of the fourth transistor, and gate electrodes of the third and the fourth transistors are coupled to gate electrodes of the first and the second transistors, respectively. The bias circuit is coupled to the first electrode of the fourth transistor, and is used for biasing a voltage level at the first electrode of the fourth transistor to make the second and the fourth transistors operate in a same region.
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Chen Yen-Horng
Lin Yu-Hsin
Hsu Winston
Mediatek Inc.
Nguyen Patricia
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