18944599. POWER AMPLIFYING CIRCUIT (Murata Manufacturing Co., Ltd.)
POWER AMPLIFYING CIRCUIT
Organization Name
Murata Manufacturing Co., Ltd.
Inventor(s)
Shinnosuke Takahashi of Kyoto (JP)
POWER AMPLIFYING CIRCUIT
This abstract first appeared for US patent application 18944599 titled 'POWER AMPLIFYING CIRCUIT
Original Abstract Submitted
A power amplifying circuit includes an output transistor that amplifies a radio frequency signal and outputs an amplified signal, a bias circuit that supplies a bias current or voltage to the output transistor, and a bias control part connected to the bias circuit and includes a control circuit that increases the bias current or voltage when an ambient temperature is equal to or less than a predetermined value. In consecutive time periods of a first, a second, and a third time period, when output of the output transistor in the third time period is greater than output of the output transistor in the first and the second time period, the bias control part increases the bias current or voltage in the second time period as to become higher than the bias current or voltage of a case where the ambient temperature is higher than the predetermined threshold value.