Mitsubishi Denki Kabushiki Kaisha

Shintarou Shinjo

Yukio Ikeda

Kazutomi Mori

Yoshinori Takahashi

Tadashi Takagi

Hiroyuki Joba

Fumimasa Kitabayashi

An inter-stage matching circuit comprises a one-stage high pass filter type matching unit and a one-stage low pass filter type matching unit serially connected with each other.

Multistage amplifier

Between resistors and an NPN bipolar transistor are interposed PNP bipolar transistors forming a current mirror that uses a collector current of the NPN bipolar transistor as a reference current, and determines a collector current of an NPN bipolar transistor . This makes possible to design a size ratio A of the PNP bipolar transistors so as to approximate a voltage drop &Dgr;Vb to a value close to zero, and to suppress the voltage drop &Dgr;Vb of the base voltage Vb accordingly to achieve a high power output and high efficiency when a high frequency input signal Pin increases and generates a base rectified current.

High-frequency amplifier

A bias condition of at least one amplifier among amplifiers other than a last-stage amplifier is set in consideration of the relation between an idle current and a saturation current.

Growing community of inventors

Tokyo, Japan

Shintarou Shinjo