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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2021/235125
Kind Code:
This amplifier device (1) comprises: an amplifier (20) that includes an amplification transistor (21) that amplifies inputted high frequency signals; a bias circuit (40) connected to the amplifier (20); an inductor (50) serially connected between the amplifier (20) and the bias circuit (40); a variable resistance circuit (70) connected to the inductor (50); and a control circuit (100). The control circuit (100) includes: a measurement circuit (110) that measures the current amplification factor of an amplification transistor (21); and a comparison circuit (130) that compares the current amplification factor measured by the measurement circuit (110) with a reference value. The control circuit (100) controls the variable resistance circuit (70) based on the comparison result by the comparison circuit (130).

SUGIMOTO, Yasutaka (10-1, Higashikotari 1-chome, Nagaokakyo-sh, Kyoto 55, JP)
Application Number:
Publication Date:
November 25, 2021
Filing Date:
April 07, 2021
Export Citation:
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MURATA MANUFACTURING CO., LTD. (Higashikotari 1-chome Nagaokakyo-sh, Kyoto 55, JP)
International Classes:
H03F1/30; H03F3/24
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (6F Tanaka Ito Pia Shin-Osaka Bldg., 3-10, Nishi Nakajima 5-chome, Yodogawa-ku, Osaka-cit, Osaka 11, JP)
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