High frequency power amplifier with high efficiency and low distortion

Assignee: Fujitsu Ltd

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Filing: 1991-08-13

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Granted: —

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Expires: 2011-08-13

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Abstract

Abstract A high frequency amplifier containing: a constant envelope signal generation circuit (21) for receiving an input electric signal, and transforming the electric signal to form two constant envelope signals where amplitudes of envelopes of the constant envelope signals are constant, and phases of the constant envelope signals correspond to an amplitude of an envelope of the input electric signal; a phase inversion means (37) for inverting a phase of one of said two constant envelope signals; and a single-ended push-pull amplifier circuit (36) for receiving the other of said two constant envelope signals, and an output of said phase inversion means (37), and synthesizing the received signals to generate an amplified signal of said input electric signal.

Inventors

👤 Naofumi Okubo
👤 Yoshihiko Asano
👤 Hiroshi Kurihara
👤 Yoshimasa Daido
👤 Kazuhiko Kobayashi
👤 Shuji Kobayakawa
👤 Toru Maniwa

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-07 18:50

CPC Classifications

H; H03; H03F; H03F1/00; H03F1/32; H03F1/3223; H03F1/02; H03F1/0205; H03F1/0294; H03F3/00; H03F3/60; H03F3/602; H03F3/604

Claims Analysis

Total Claims: 2

Claim 1

Independent Claim 117 words

A high frequency amplifier comprising: a constant envelope signal generation circuit (21) for receiving an input electric signal, and transforming the electric signal to form two constant envelope signals where amplitudes of envelopes of the constant envelope signals are constant, and phases of the constant envelope signals correspond to an amplitude of an envelope of the input electric signal; a phase inversion means (37) for inverting a phase of one of said two constant envelope signals; and a single-ended push-pull amplifier circuit (36) for receiving the other of said two constant envelope signals, and an output of said phase inversion means (37), and synthesizing the received signals to generate an amplified signal of said input electric signal.

Claim 2

Dependent Claim 61 words

A high frequency amplifier according to claim 1, wherein said single-ended push-pull amplifier circuit (36) comprises first and second amplifying devices being serially connected, and said first and second amplifying devices are each one of a class "AB" amplifier, a class "B" amplifier, and a class "C" amplifier, wherein a current which flows therethrough varies depending upon an input power thereof.

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