Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-06-14
2009-06-30
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
Reexamination Certificate
active
07554401
ABSTRACT:
A power amplifier based on a voltage-coupling scheme is disclosed. The power amplifier includes two active elements connected to each other via a primary part of a transformer, in which one of the two active elements is connected to a power-supply voltage of the amplifier, the other one is connected to a ground terminal of the amplifier, and an output power appears in a secondary part of the transformer. Therefore, a potential difference between ports of the active elements is decreased, resulting in increased reliability of the power amplifier.
REFERENCES:
patent: 5805021 (1998-09-01), Brehmer
patent: 7339427 (2008-03-01), Macphail
Choi, K. et al., “A 900MHz GSM PA In 250nm CMOS With Breakdown Voltage Protection And Programmable Conduction Angle*,” IEEE Radio Frequency Integrated Circuits Symposium, TU1C-4, pp. 369-372, Jun. 2004.
Hong Song-cheol
Park Changkun
Son Ki Yong
Korea Advanced Institute of Science and Technology
Nguyen Khiem D
Oliff & Berridg,e PLC
Pascal Robert
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