FM Transmitter with frequency ramp phase and amplitude correctio

Details FM Transmitter with frequency ramp phase and amplitude correctio FM Transmitter with frequency ramp phase and amplitude correctio

1980-12-08

1982-11-16

Bookbinder, Marc E.

Telecommunications

Transmitter

Angle modulation

332 18, 375 1, 343 172PC, 455126, H04B 102

Patent

active

043597793

ABSTRACT:
A system including a frequency ramp generator feeding a transmitting power amplifier and antenna through a phase modulator and gain-controllable, transmitter driver stage. The frequency ramp generated is sampled out through a wide band delay-line feeding a phase comparator, the other comparison input to the phase comparator being provided by a sampling probe at the transmitting power amplifier output. The phase comparator output is used as a phase correction signal applied to the phase modulator and an amplitude modulation detector also responsive to the signal on the transmitting power amplifier output provides a feedback signal controlling the gain of the transmitter driver on a high bandwidth basis. Accordingly, instantaneous and long term frequency ramp phase and amplitude variations are substantially cancelled out so that the power amplified output is an accurate replica of the originally generated frequency ramp.

REFERENCES:
patent: 3679983 (1972-07-01), Theriot
patent: 3900823 (1975-08-01), Sokal et al.

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