Journal
IEEE ELECTRON DEVICE LETTERS
Volume 32, Issue 1, Pages 3-5Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2010.2087313
Keywords
Biomedical telemetry; heterojunction bipolar transistors (HBTs); low-voltage operation; RF circuit design; silicon-germanium (SiGe); SiGe HBTs
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We investigate, for the first time, the feasibility of operating silicon-germanium (SiGe) heterojunction bipolar transistors (HBTs) in a weakly saturated bias regime to enable ultralow-voltage RF front-end design. Measured dc, ac, and RF characteristics of third-generation high-performance SiGe HBTs operating in weak saturation are presented. Robust RF operation of 0.12 x 6.0 mu m(2) SiGe HBTs are demonstrated in a common-emitter configuration at collector-to-emitter voltages above 0.15 V. A noise figure of 1.33 dB and an input third-order intercept point above -8 dBm for a 3-GHz input tone are achieved at 0.30 V. These results have potential implications for RF circuits used in severely power-constrained systems.
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