Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Reexamination Certificate
2007-03-13
2009-11-17
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
C330S310000
Reexamination Certificate
active
07619482
ABSTRACT:
An apparatus comprising a first stage and a second stage. The first stage generally comprises a first transistor configured as a common-emitter amplifier. The second stage generally comprises a second and third transistor configured as a low voltage Darlington transistor pair. The first stage may be directly coupled to the second stage. The second transistor generally comprises a field effect (FET) input transistor. The third transistor generally comprises a bipolar output transistor. In one example, the apparatus may comprise a 2-stage RF amplifier operating from DC to microwave frequencies.
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Choe Henry K
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