Linearly frequency-modulated high-frequency oscillator with high

Details Linearly frequency-modulated high-frequency oscillator with high Linearly frequency-modulated high-frequency oscillator with high

1986-10-29

1988-03-01

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331117D, 331177V, H03B 518

Patent

active

047289090

ABSTRACT:
A high-frequency modulator which is linearly modulated in a frequency range around a center frequency and comprises a high-gain field effect transistor whose output is fed-back to the input from a coupler constituted by two relatively fine lines which are sufficiently remote from each other to provide that at the input of the transistor the majority of the high power available at its output is reinjected, and thus a high external Q factor is obtained. The modulation circuit which is arranged in parallel with the feedback network includes a varicap which is arranged in series with three line elements and a fixed capacitor calculated for optimizing the linearity of the frequency modulation as a function of the control voltage of the varicap. The circuit may be used for example, in equipment such as radio altimeter sources or proximity fuses, auto-directional systems and long-range radar.

REFERENCES:
patent: 4310809 (1982-01-01), Buck et al.

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