Semiconductor device, power amplifier device and PC card
First Claim
1. A power amplifier device having one or a plurality of amplification systems, wherein said amplification system has a semiconductor chip in which a transistor is formed and a plurality of external electrode terminals, wherein said external electrode terminals are an input terminal to which a signal to be amplified is supplied, an output terminal for outputting the amplified signal, and first, second, and third power source terminals, wherein said transistor is electrically connected between said input terminal and said output terminal, wherein electrodes of said transistor are a control electrode connected to said input terminal and said third power source terminal, a first electrode connected to said output terminal and said first power source terminal, and a second electrode connected to said second power source terminal serving as an earth terminal, wherein over a top face of said semiconductor chip, an electrode pad corresponding to said external electrode terminal and a plurality of electrode pads formed in a portion of said second electrode of said transistor are provided, wherein a conductive wire for electrically connecting said external electrode terminal with said electrode pad corresponding to the external electrode terminal, and a conductive wire for electrically connecting the plurality of electrode pads formed in the portion of said second electrode of said transistor with said second power source terminal are provided, wherein each of said electrodes of said transistor is constructed by a base portion and a plurality of fingers projected in a direction orthogonal to said base portion, one of the fingers of said first electrode is disposed between two neighboring fingers of said second electrode, wherein said second electrode is connected to a fixed potential, and wherein a width of each of said fingers positioned at both ends of said second electrode is wider than a width of each of said fingers positioned between said both ends.
1 Assignment
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Accused Products
Abstract
The present invention is directed to improve high frequency characteristics by reducing inductance of a source. In an HEMT assembled in a power amplifier device, each of a drain electrode, a source electrode, and a gate electrode is constructed by a base portion and a plurality of fingers projected in a comb-teeth shape from the base portion, and the fingers of the electrodes mesh with each other. In the source electrode, a width of the fingers positioned at both ends of the plurality of fingers is wider than a width of each of the fingers positioned between both ends. The width of each of the fingers positioned at both ends is a width equal to or larger than a sum of the widths of the plurality of fingers positioned between both ends, and the width of the base portion is wider than that of each of the fingers positioned at both ends. An electrode pad provided for the source base portion and an external electrode terminal are connected to each other via a conductive wire.
20 Citations
1 Claim
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1. A power amplifier device having one or a plurality of amplification systems,
wherein said amplification system has a semiconductor chip in which a transistor is formed and a plurality of external electrode terminals, wherein said external electrode terminals are an input terminal to which a signal to be amplified is supplied, an output terminal for outputting the amplified signal, and first, second, and third power source terminals, wherein said transistor is electrically connected between said input terminal and said output terminal, wherein electrodes of said transistor are a control electrode connected to said input terminal and said third power source terminal, a first electrode connected to said output terminal and said first power source terminal, and a second electrode connected to said second power source terminal serving as an earth terminal, wherein over a top face of said semiconductor chip, an electrode pad corresponding to said external electrode terminal and a plurality of electrode pads formed in a portion of said second electrode of said transistor are provided, wherein a conductive wire for electrically connecting said external electrode terminal with said electrode pad corresponding to the external electrode terminal, and a conductive wire for electrically connecting the plurality of electrode pads formed in the portion of said second electrode of said transistor with said second power source terminal are provided, wherein each of said electrodes of said transistor is constructed by a base portion and a plurality of fingers projected in a direction orthogonal to said base portion, one of the fingers of said first electrode is disposed between two neighboring fingers of said second electrode, wherein said second electrode is connected to a fixed potential, and wherein a width of each of said fingers positioned at both ends of said second electrode is wider than a width of each of said fingers positioned between said both ends.
Specification