Amplifiers – Signal feedback – Phase shift means in loop path
Reexamination Certificate
2007-11-20
2007-11-20
Pert, Evan (Department: 2826)
Amplifiers
Signal feedback
Phase shift means in loop path
C330S294000, C455S254000
Reexamination Certificate
active
10945987
ABSTRACT:
An amplifier circuit amplifies a signal inputted from an input terminal. A first feedback circuit is placed across an emitter of a bipolar transistor and an input of the amplifier circuit. A second feedback circuit is placed across the input and an output of the amplifier circuit for feeding the output of the amplifier circuit back to the input of the amplifier circuit. A phase change amount in the feedback circuit is determined by the values of an inductor and a capacitor. The values of these elements are selected so that a phase of a signal in which fundamental waves included in two feedback signals are combined and a phase of a signal in which second harmonics included in the two feedback signals are combined are shifted by approximately 180 degrees from a phase of a fundamental wave of an input signal.
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Itoh Jyunji
Nakano Hideo
Nakatani Toshifumi
Pert Evan
Wenderoth , Lind & Ponack, L.L.P.
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