1results about How to "Does not affect cost" patented technology

Maintaining the characteristics of the power amplifier circuit without affecting cost. The power amplifier circuit has multiple amplification stages, including: a first amplification stage that amplifies the input high-frequency signal; a second amplification stage that amplifies the output of the first amplification stage; and a switching stage disposed on the power supply path to the first amplification stage, wherein power is supplied to the first amplification stage via the switching stage, and the switching stage sets the power supply to the first amplification stage to be on or off, and the power is directly supplied to the second amplification stage without passing through the switching stage.