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• W2079303196 abstract "MESFET's with gates 1 µm long were fabricated in LPE layers of InP on Cr-doped InP substrates. The quality of the LPE material is characterized by an electron concentration of 4 × 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>15</sup> cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-3</sup> with a mobility of 2.6 × 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>4</sup> cm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> V <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-1</sup> s <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-1</sup> at 77 K for growths from undoped melts. The devices have current gain cutoff frequencies of 20 GHZ or somewhat larger. This value is greater than that of the best analogous GaAs MESFET bya factor of 1.5. A factor of 1.3 is predicted on the basis of a simple theory. The highest power gain cutoff frequency, f <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>max</inf> , for the InP device is 33 GHz which is somewhat smaller than that of the best analogous GaAs device. The lowest minimum noise figure at 10 GHz for these first InP devices is 3.9 dB with an associated gain of 4.8 dB. The best result for the GaAs counterpart is 3.2 dB with an associated gain of 7.8 dB. The power gain of the InP device suffers compared to the GaAs device because of degenerative feedback resulting from a large gate-to-drain capacitance and because of a small output resistance. If the magnitudes of these two equivalent circuit elements were the same for MESFET's in the two materials, f <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>max</inf> for the InP device would be more than double its present value." @default.
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• W2079303196 date "1975-11-01" @default.
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• W2079303196 title "InP Schottky-gate field-effect transistors" @default.
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