Method and apparatus for digitally controlling an amplitude modu

Details Method and apparatus for digitally controlling an amplitude modu Method and apparatus for digitally controlling an amplitude modu

1975-03-21

1977-08-02

Miller, Charles D.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

328 14, 332 37D, 235197, H04B 100

Patent

active

040399516

ABSTRACT:
An amplitude modulator circuit that generates from digital values stored in a read only memory, envelope amplitude samples that are digitized in the ROM and are incremented out by an incrementing address counter that is clocked at a given clock rate to a digital to analog converter. The shape of the waveform envelope may be changed by selectively changing the clock rate. The modulator also has envelope correction means, wherein the amplified RF pulse envelope that may be distorted, is detected and fed back through an operational amplifier for changing the analog waveform shape modulated onto the RF signal.

REFERENCES:
patent: 2764738 (1956-09-01), Bush
patent: 3035234 (1962-05-01), Hillman
patent: 3739374 (1973-06-01), Kiowski
patent: 3740670 (1973-06-01), Hoffman
patent: 3794995 (1974-02-01), Thompson
patent: 3868601 (1975-02-01), MacAfee

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