Matsushita Electric Industrial Co., Ltd.

Kazuhiro Arai

Yorito Ota

Shinichi Sonetaka

Yasuyuki Toyoda

There is provided a bipolar transistor that enables a desirably enhanced high-frequency performance to be obtained when used as an oscillation amplifier of an oscillation circuit, and that is miniaturized and reduced in cost. A capacitance adjustment line () connected to a base pad () forms a parasitic capacitor with respect to an Ncollector substrate by interposing an insulating film () and an N collector substrate therebetween, thereby increasing collector-base capacitance C. This capacitor is incorporated into a bipolar transistor, which functions as an oscillation amplifier and has a small transistor operation region (), at least as a part of a balance capacitor constituting the oscillation circuit in the course of production of a semiconductor.

Bipolar transistor, oscillation circuit, and voltage controlled oscillator

Bipolar transistor, for voltage controlled oscillator using a capacitance adjustment line

A bipolar transistor includes the first group of transistors, the second group of transistors, the third group of transistorsand the fourth group of transistors. The groups of transistors have unit transistors with emitters, bases and collectors that are connected electrically in parallel and the number of unit transistors is different from group to group and 2, 4, 8, and 16, respectively.

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Imaichi, Japan

Kazuhiro Arai