Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Reexamination Certificate
2005-09-20
2005-09-20
Nguyen, Khanh V. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
C330S285000
Reexamination Certificate
active
06946911
ABSTRACT:
An exemplary bias circuit is coupled to an amplifier. The bias circuit comprises a first bipolar transistor, a second bipolar transistor and a third bipolar transistor. The first bipolar transistor has a base connected to a first node, and the first node is connected to a reference voltage through a first resistor. The second bipolar transistor has a base connected to the first node. The third bipolar transistor has a collector connected to the first node and a base connected to an emitter of the first bipolar transistor at a second node. An emitter of the second bipolar transistor is connected to a base of a fourth bipolar transistor associated with the amplifier, and the second bipolar transistor does not have a resistor connected to the emitter of the second bipolar transistor.
REFERENCES:
patent: 6331799 (2001-12-01), Miyazawa
patent: 6556082 (2003-04-01), Wang et al.
Cheng Nai-Shuo
Choi Kevin
Yang Youn-goo
Farjami & Farjami LLP
Nguyen Khanh V.
Skyworks Solutions Inc.
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