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Amplitude variations in a frequency-modulated oscillator

โœ Scribed by W.J. Cunningham

Publisher
Elsevier Science
Year
1953
Tongue
English
Weight
639 KB
Volume
256
Category
Article
ISSN
0016-0032

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โœฆ Synopsis

Frequency modulation of a vacuum-tube oscillator often is accomplished by causing the capacitance in the circuit to vary in accordance with a modulating signal. Because of the way in which the amplitude of the alternating voltage generated by the oscillator is controlled, variation of the capacitance introduces simultaneous amplitude modulation of this voltage. The nature and amount of amplitude modulation depend upon the interrelation of several parameters of the oscillating system. An analysis is presented for this type of modulation. Limitations inherent in the analysis include maximum values for the magnitude of the change in capacitance and for the time rate of this change. Elements of the oscillator are assumed to be chosen so that the generated voltage is nearly sinusoidal. These assumptions usually apply in practice.

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