Asymmetric multivibrator
Asymmetric multivibrator a multivibrator where the output voltage represents a train of narrow pulses. Most asymmetric multivibrators use a slow charge of a large timing capacitor by a small current (or via a large resistor) and a fast discharge of this capacitor via a switch. The charge process determines the duration of space, the mark duration, which coincides with the time allowed for discharge of the timing capacitor, is usually determined by a small time constant of the circuit controlling the switch. Asymmetric multivibrators find applications in voltage-to-frequency converters. Also called multivibrators with a small mark/space ratio.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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