Title:
HIGH FREQUENCY POWER AMPLIFIER
Document Type and Number:
Japanese Patent JP3790086
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent an undesired phenomenon such as oscillation by a feedback signal and to realize a stable operation in a high frequency power amplifier where output power is controlled by switching a high frequency amplification means connected in parallel.
SOLUTION: A prescribed high frequency amplification means in N-pieces of high frequency amplification means is constituted in such a way that three or more amplification elements are connected in multiple stages. A control means controls at least one high frequency amplification means controlled to an off state among the prescribed high frequency amplification means in such a way that at least one amplification element except for the amplification elements of an initial stage and a final stage is set to be an on state. A high signal inputted from a common signal input terminal is amplified by the high frequency amplification means in an on state. The rate of signals which run back the high frequency amplification means in an off state from a common signal output terminal and feeds back to the common signal input terminal is reduced.
Inventors:
Koji Okazaki
Katsuhiko Araki
Katsuhiko Araki
Application Number:
JP2000081995A
Publication Date:
June 28, 2006
Filing Date:
March 23, 2000
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H03F3/60; H03F3/68; H03F1/02; H03F1/08; H03F3/20; (IPC1-7): H03F3/68; H03F1/02; H03F1/08; H03F3/20; H03F3/60
Domestic Patent References:
| JP4095411A | ||||
| JP6053753A | ||||
| JP4054006A | ||||
| JP7336168A |
Attorney, Agent or Firm:
Furuya Fumio
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