Amplifiers – Signal feedback – Phase shift means in loop path
Reexamination Certificate
2007-02-13
2007-02-13
Pascal, Robert (Department: 2817)
Amplifiers
Signal feedback
Phase shift means in loop path
Reexamination Certificate
active
11142406
ABSTRACT:
A multistage amplifying device for amplifying a desired signal comprise first to N-th amplifiers connected in cascade,wherein the k-th (k is 1 to N) amplifier includes a k-th amplification section; and a k-th feedback section which has a reactance component, changes a phase of a signal output from the k-th amplification section. When a phase difference between the desired signal output from the N-th amplifier and a third-order inter-modulation distortion(IM3) output from the (N−1)-th amplifier is referred to as a first phase, and a phase difference between the desired signal output from the N-th amplifier, and a combined IM3 obtained by combining a IM3 occurring in the N-th amplification section and a IM3 fed back from the N-th feedback section is referred to as a second phase, a difference between the first phase and the second phase is 120° or more and 180° or less.
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Matsushita Electric - Industrial Co., Ltd.
Nguyen Hieu
Pascal Robert
Wenderoth , Lind & Ponack, L.L.P.
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