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Patent Searching and Data


Title:
VARIABLE GAIN AMPLIFIER
Document Type and Number:
WIPO Patent Application WO/2019/187924
Kind Code:
A1
Abstract:
The present invention allows a power amplifier to have a variable gain function without lowering the output power of the power amplifier. A gain adjustment unit 102 formed of a distribution switch 6 having a control terminal PC is provided in an input unit of an amplification circuit 101. One terminal of a coupler CP is connected to an output line of the amplification circuit 101, the other terminal of the coupler CP is connected to the anode of a diode D1, and a monitoring terminal PM is connected to the cathode of the diode D1 through a low pass filter PLF1. The anode of the diode D1 becomes bias-free (a ground potential is set to 0 volts).

Inventors:
HAMADA, Hiroshi (9-11 Midori-cho 3-chome, Musashino-sh, Tokyo 85, 〒1808585, JP)
NOSAKA, Hideyuki (9-11 Midori-cho 3-chome, Musashino-sh, Tokyo 85, 〒1808585, JP)
Application Number:
JP2019/007512
Publication Date:
October 03, 2019
Filing Date:
February 27, 2019
Export Citation:
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Assignee:
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (5-1 Otemachi 1-chome, Chiyoda-ku Tokyo, 16, 〒1008116, JP)
International Classes:
H04B1/02; H01P5/18; H03D1/10; H03G3/30
Foreign References:
JPS63187820A1988-08-03
JP2010183453A2010-08-19
JPH06177780A1994-06-24
JP2015046741A2015-03-12
Attorney, Agent or Firm:
YAMAKAWA, Shigeki et al. (4th Floor Sanno Park Tower, 11-1, Nagatacho 2-chome, Chiyoda-k, Tokyo 04, 〒1006104, JP)
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