Resonant linear frequency modulator

Details Resonant linear frequency modulator Resonant linear frequency modulator

1978-05-30

1980-02-19

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331117D, H03C 322

Patent

active

041896904

ABSTRACT:
A circuit which modulates an r.f. carrier to produce an FM signal having a substantially linear frequency relation to an applied modulating voltage over a selected deviation bandwidth. An r.f. oscillator having an output matching circuit supplies the carrier to a modulator. The impedance of the oscillator is adjusted by the matching circuit to present a desired reactive mismatch to the modulator over the bandwidth. The modulator includes a pair of voltage dependent reactive impedance elements, oppositely biased and separated by a quarter wavelength line which acts as an impedance inverter. A modulating voltage applied to both of the elements causes a reactive imbalance therebetween, affecting either a net inductive or capacitive change in the load impedance presented to the oscillator. The center frequency of the circuit reacts in a substantially linear manner to the modulating voltage over the deviation bandwidth.

REFERENCES:
patent: 3961286 (1976-06-01), Kim
IEEE Transactions on Microwave Theory and Techniques, Mar. 1969, p. 144.

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