An astable multivibrator formed by a novel NDRHBT

被引:0
|
作者
Niu, Pingjuan [1 ]
Guo, Weilian [1 ,2 ]
Yu, Xin [1 ]
Li, Xiaoyun [1 ]
Zhang, Shilin [2 ]
Qi, Haitao [2 ]
Miao, Changyun [1 ]
Wang, Xiaoli [1 ]
Wang, Wei [1 ]
机构
[1] Tianjin Polytech Univ, Sch Informat & Commun Eng, Tianjin 300160, Peoples R China
[2] Tianjin Univ, Sch Elect & Inform Engn, Tianjin 300072, Peoples R China
来源
MICROELECTRONICS: DESIGN, TECHNOLOGY, AND PACKAGING III | 2008年 / 6798卷
关键词
NDR; HBT; astable multivibrator; ultra-thin base structure; frequency modulation; GaAs-based;
D O I
10.1117/12.755007
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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 V-BE or base current I-B. So the astable multivibrator formed by NDRHBT has the advantage of high speed, high frequency, bistability, and frequency modulation by V-BE or I-B. 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 V-BE. The experimental result shows that the frequency of time interval between two adjacent pulses f(1) varies from 7 x 10(4) Hz down to 2.5 x 10(4) Hz 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.
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页数:9
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