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Proceedings Paper

An astable multivibrator formed by a novel NDRHBT
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Paper Abstract

The earlier astable multivibrator formed by silicon tunnel diode has the disadvantage of low speed and non-modulation. NDRHBT is a novel type of HBT with NDR characteristics and high speed. Its NDR characteristics can be modulated by the base voltage VBE or base current IB. So the astable multivibrator formed by NDRHBT has the advantage of high speed, high frequency, bistability, and frequency modulation by VBE or IB. Thus, it can be applied widely in high frequency oscillation circuits and high speed-digital circuits. In this paper, it is demonstrated that the frequency of the astable multivibrator can be modulated by base voltage VBE. The experimental result shows that the frequency of time interval between two adjacent pulses f1 varies from 7×104Hz down to 2.5×104Hz as VBE changes from 4.5V to 6.5V and exhibits near a linear relationship. So it is can be used as an efficient voltage controlled frequency modulator for pulse signal in high speed digital circuits.

Paper Details

Date Published: 21 December 2007
PDF: 9 pages
Proc. SPIE 6798, Microelectronics: Design, Technology, and Packaging III, 679813 (21 December 2007); doi: 10.1117/12.755007
Show Author Affiliations
Pingjuan Niu, Tianjin Polytechnic Univ. (China)
Weilian Guo, Tianjin Polytechnic Univ. (China)
Tianjin Univ. (China)
Xin Yu, Tianjin Polytechnic Univ. (China)
Xiaoyun Li, Tianjin Polytechnic Univ. (China)
Shilin Zhang, Tianjin Univ. (China)
Haitao Qi, Tianjin Univ. (China)
Changyun Miao, Tianjin Polytechnic Univ. (China)
Xiaoli Wang, Tianjin Polytechnic Univ. (China)
Wei Wang, Tianjin Polytechnic Univ. (China)

Published in SPIE Proceedings Vol. 6798:
Microelectronics: Design, Technology, and Packaging III
Alex J. Hariz; Vijay K. Varadan, Editor(s)

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