Switching time in relaxation oscillations of emitter-coupled multivibrators

被引:7
|
作者
Filanovsky, Igor M. [1 ]
Oliveira, Luis Bica [2 ,3 ]
Verhoeven, Chris J. M. [4 ]
Fernandes, Jorge R. [2 ,5 ]
机构
[1] Univ Alberta, Dept Elect & Comp Engn, Edmonton, AB T6G 2V4, Canada
[2] INESC ID, P-1000 Lisbon, Portugal
[3] Univ Nova Lisboa, P-1099985 Lisbon, Portugal
[4] Delft Univ Technol, NL-2628 CN Delft, Netherlands
[5] Univ Tecn Lisboa, P-1359025 Lisbon, Portugal
关键词
emitter-coupled multivibrators; fitting coefficient; oscillation frequency; root-locus; switching time;
D O I
10.1109/TCSII.2008.923453
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
This paper gives an estimation of the switching time between ON and OFF transistor states for the emitter-coupled multivibrator. The calculation uses the root locus of the characteristic equation for the oscillator small-signal equivalent circuit, while changing the device current as a parameter. The switching time is found using a fitting location of the root in the right half of the s-plane. The oscillation frequency is also obtained. The approach provides a further insight into switching behavior of relaxation oscillators, gives an accurate estimation of the oscillation frequency, and allows one to establish a useful connection between sinusoidal and relaxation oscillators. The theoretical results are confirmed by simulations.
引用
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页码:892 / 896
页数:5
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