Journal
IEEE ELECTRON DEVICE LETTERS
Volume 22, Issue 11, Pages 542-544Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/55.962657
Keywords
bipolar transistors; germanium; semiconductor heterojunctions; silicon
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A record 210-GHz f(T) SiGe heterojunction bipolar transistor at a collector current density of 6-9 mA/mum(2) is fabricated with a new nonself-aligned (NSA) structure based on 0.18 pm technology. This NSA structure has a low-complexity emitter and extrinsic base process which reduces overall thermal cycle and minimizes transient enhanced diffusion. A low-power performance has been achieved which requires only 1 mA collector current to reach 200-GHz f(T). The performance is a result of narrow base width and reduced parasitics in the device. Detailed comparison is made to a 120-GHz self-aligned production device.
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