04580111 is referenced by 151 patents and cites 16 patents.

An amplitude modulator (10) is disclosed which generates an amplitude modulated carrier signal by selectively combining varying numbers of other carrier signals. A circuit (20) is included which provides plural carrier signals of like frequency and phase where the number of carrier signals being provided is dependent upon the level of an input signal. A combiner circuit (22) combines the plural carrier signals to thereby provide a combined signal which is the desired amplitude modulated carrier signal. In one embodiment (FIG. 3) the carrier signals which are combined are all equal in amplitude. In another embodiment (FIG. 4) the amplitudes of some of the carrier signals are weighted in a binary progression. In yet another embodiment (FIG. 9) the carrier signals are all frequency modulated whereby the output signal has both a varying frequency and amplitude.

Title
Amplitude modulation using digitally selected carrier amplifiers
Application Number
6/334083
Publication Number
4580111
Application Date
December 24, 1981
Publication Date
April 1, 1986
Inventor
Hilmer I Swanson
Quincy
IL, US
Agent
Yount & Tarolli
Assignee
Harris Corporation
FL, US
IPC
H03C 1/00
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