Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Reexamination Certificate
2007-05-24
2009-06-16
Nguyen, Khanh V (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural amplifier channels
Reexamination Certificate
active
07548118
ABSTRACT:
A semiconductor device1includes a plurality of amplifier circuits2connected in parallel between an input terminal RFin and an output terminal RFout. Each of the amplifier circuits2includes an HBT3, an oscillation stabilizing circuit4connected between the input terminal RFin and a base B of the HBT3, and a ballast resistor5connected between a bias terminal Bin and the base B of the HBT3. The oscillation stabilizing circuit4includes a resistor6and a capacitor7connected in parallel. Thus, thermorunaway of the HBT3can be prevented using the ballast resistor5, and the stability against oscillation can be improved using the oscillation stabilizing circuit4even at low frequencies.
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Written Opinion.
International Search Report issued Dec. 27, 2005.
German Office Action issued in connection with corresponding German Application No. 112005002800.3-35.
Chinese Office Action issued Nov. 7, 2008 in connection with corresponding Chinese Application No. 200580037810.3 with Japanese and English language translations.
Ariie Mitsuo
Sugimoto Yasutaka
Murata Manufacturing Co. Ltd.
Nguyen Khanh V
Ostrolenk Faber Gerb & Soffen, LLP
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