Mitsubishi Electric Corporation

Kenji Mukai

Kenichi Horiguchi

Satoshi Miho

Kazuya Yamamoto

Koji Yamanaka

Miyo Miyashita

Hiroshi Otsuka

Takayuki Matsuzuka

Morishige Hieda

Tomoyuki Asada

Yoichi Nogami

Yutaro Yamaguchi

Shigeo Yamabe

Tatsuo Kohama

Naoko Nitta

Reduction in impedance in a lead connected to a semiconductor element is achieved while achieving anchor effect. The semiconductor device includes a heatsink, a semiconductor element, a lead disposed on an upper side of the heatsink, and a molding material formed to cover the lead, the heatsink, and the semiconductor element. Formed on an edge portion of a lower surface in a position, in the heatsink, overlapping with the lead in a plan view is a first convex portion protruding more than an edge portion of an upper surface in the position, and formed on an edge portion of an upper surface in a position, in the heatsink, which does not overlap with the lead in a plan view is a second convex portion protruding more than an edge portion of a lower surface in the position.

Semiconductor device, high-frequency power amplifier, and method of manufacturing semiconductor device

A comparatorthat detects the difference between a high frequency signal detected by a detectorand a feedback signal A output from a comparator; a comparatorthat detects the difference between the difference detected by the comparatorand a feedback signal B output from an adder; and a loop filterthat passes only a prescribed low frequency band of the output signal of the comparatorare provided, in which an amplitude sensitivity adjusteradjusts the amplitude sensitivity of a variable gain amplifierin accordance with the rate of change of the signal passing through the loop filter, thereby controlling the gain of the variable gain amplifier

Analog feedback amplifier

A power amplifier includes a first amplifier unit, a second amplifier unit, and an attenuator. The second amplifier receives a signal from the first amplifier unit and amplifies the signal. The attenuator is provided between the first and second amplifier units. The attenuator has arms, including at least one parallel arm and at least one series arm, and has switches connected to the arms to switch the electrical connection states of the arms with respect to the first and second amplifier units. The at least one parallel arm and the at least one series arm are alternately arranged, in the order named, as viewed in the direction from the first amplifier unit to the second amplifier unit.

Power amplifier

Growing community of inventors

Tokyo, Japan

Kenji Mukai