Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1984-12-28
1986-04-22
LaRoche, Eugene R.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 17, 332 23R, 332 31R, 332 48, 375 41, 455108, H03C 100, H03C 300
Patent
active
045845417
ABSTRACT:
A phase modulator includes a digital frequency word generator, an adder and a register arranged to generate recurrent digital sawtooth signals at a carrier rate. A second digital adder is coupled to receive the sawtooth signals and also receives digital information signals. The adder produces recurrent digital sawtooth signals phase-modulated by the information signal. A pair of adders receive the digital sawtooth signals and mutually sign-reversed digital information signals to produce a pair of oppositely phase-modulated constant-amplitude signals in a pair of channels. A sine memory is addressed by the phase-modulated digital sawtooth signals to produce phase-modulated sinusoidal-representative digital signals. The digital signals are then converted to analog signals. Since the two channels contain signals which are phase-modulated but not amplitude-modulated, the signals may be amplified by nonlinear amplifiers. An adder is coupled to the outputs of the two channels to sum together the two phase-modulated signals to produce an amplitude-modulated signal. Combinations of amplitude and phase modulation may be generated by a combined structure.
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Article-Frequency Domain Yields its Data to Phase-Locked Synthesizer, by Gibbs et al., published in Electronics Magazine, Apr. 27, 1978, pp. 107-113.
LaRoche Eugene R.
Meise William H.
Mis D. C.
RCA Corporation
Tripoli Joseph S.
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