Title:
AMPLIFIER DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/235125
Kind Code:
A1
Abstract:
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).
Inventors:
SUGIMOTO YASUTAKA (JP)
Application Number:
PCT/JP2021/014736
Publication Date:
November 25, 2021
Filing Date:
April 07, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03F1/30; H03F3/24
Foreign References:
| JPH04252606A | 1992-09-08 | |||
| JP2006319436A | 2006-11-24 | |||
| JP2018019291A | 2018-02-01 |
Attorney, Agent or Firm:
YOSHIKAWA, Shuichi et al. (JP)
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