Frequency linearization and sensitivity equalization of a freque

Details Frequency linearization and sensitivity equalization of a freque Frequency linearization and sensitivity equalization of a freque

1977-06-03

1978-05-09

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331116R, 331177V, 332 16T, 332 30V, H03C 322

Patent

active

040889688

ABSTRACT:
A direct FM modulator includes an oscillator comprising a current conducting device providing amplification to sustain oscillations and a frequency determining circuit connected thereto for controlling the frequency of oscillation. The frequency determining circuit includes a piezoelectric element in series with a voltage variable capacitance and an adjustable capacitance coupled across this series combination. The capacitance of the voltage variable capacitance is changed by a modulating voltage to provide frequency deviation about the center frequency of oscillation. A frequency linearization of the crystal oscillator is provided by a selected value of capacitance coupled across the varactor and the capacitance value of the adjustable capacitance such that the frequency deviation vs. voltage is maximum at the initial reference bias voltage and is symmetrical about this reference bias.

REFERENCES:
patent: 3631364 (1971-12-01), Schilb et al.
patent: 4001724 (1977-01-01), Keller

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