DocumentCode :
978448
Title :
Analysis of emitter (source)-coupled multivibrators
Author :
Buonomo, Antonio ; Schiavo, Alessandro Lo
Author_Institution :
Dipt. di Ingegneria dell´´Informazione, Univ. degli Studi di Napoli
Volume :
53
Issue :
6
fYear :
2006
fDate :
6/1/2006 12:00:00 AM
Firstpage :
1193
Lastpage :
1202
Abstract :
The popular emitter-coupled multivibrator and its MOS variant are analyzed using the classical discontinuity theory. Accurate formulas for predicting their relaxation oscillation are obtained solving the nonlinear circuit equation, which is derived finding the voltage-current characteristic of the nonlinearity connected to the timing capacitor. Then, using a small-signal equivalent circuit accounting for the intrinsic capacitances of the devices, we investigate the high-frequency behavior of these circuits finding the oscillation start-up condition. We show that they can exhibit a completely different behavior, similar to a series LC-tuned oscillator, without using an inductor. Numerical simulations are performed showing that the presented formulas are more accurate than the existing ones and that both behaviors are possible
Keywords :
equivalent circuits; multivibrators; relaxation oscillators; timing circuits; MOS variant; classical discontinuity theory; emitter source-coupled multivibrators; nonlinear circuit equation; oscillation start-up condition; relaxation oscillation; small-signal equivalent circuit; timing capacitor; voltage-current characteristic; Capacitance; Equivalent circuits; Inductors; MOS capacitors; Nonlinear circuits; Nonlinear equations; Numerical simulation; Oscillators; Timing; Voltage; Multivibrators; negative resistance circuits; nonlinear circuits; oscillators; relaxation oscillators;
fLanguage :
English
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
Publisher :
ieee
ISSN :
1549-8328
Type :
jour
DOI :
10.1109/TCSI.2006.875165
Filename :
1643426
Link To Document :
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