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Schottky-Collector Heterojunction Bipolar Transistors: Device Scaling Laws for fmax beyond 500 GHz

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Abstract

Heterojunction bipolar transistors (HBTs) have high transconductance and extremely reproducible DC parameters. These attributes make HBTs the device of choice for high-speed precision analog and mixed analog-digital circuits. HBT cutoff frequencies are however considerably below that of high-electron-mobility field-effect-transistors (HEMTs).

© 1995 Optical Society of America

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