Modulation linearization of a frequencymodulated voltage controlled oscillator, part 3
Abstract
An analysis is presented for the voltage versus frequency characteristics of a varactor modulated VHF voltage controlled oscillator in which the frequency deviation is linearized by using the nonlinear characteristics of a field effect transistor as a signal amplifier. The equations developed are used to calculate the oscillator output frequency in terms of pertinent circuit parameters. It is shown that the nonlinearity exponent of the FET has a pronounced influence on frequency deviation linearity, whereas the junction exponent of the varactor controls total frequency deviation for a given input signal. A design example for a 250 MHz frequency modulated oscillator is presented.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 September 1975
 Bibcode:
 1975STIN...7532316H
 Keywords:

 Frequency Modulation;
 Oscillators;
 Very High Frequencies;
 Voltage Regulators;
 Nonlinear Systems;
 Varactor Diodes;
 Electronics and Electrical Engineering