Amplitude and phase modulation using dual digital delay vectors

Details Amplitude and phase modulation using dual digital delay vectors Amplitude and phase modulation using dual digital delay vectors

2006-01-03

2006-01-03

Chang, Joseph (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

Plural modulation

C332S103000, C375S298000

Reexamination Certificate

active

06982607

ABSTRACT:
The present invention provides a means to implement amplitude and phase modulation digitally and directly at an RF frequency that benefits from high output power using non-linear amplifiers. This is accomplished by the combination of two constant amplitude phase varying vectors. A reference oscillator produces a carrier signal, which is supplied to two digital delay lines composed of a sequence of delay banks. The delay lines are controlled by lookup tables that are updated by the vector control circuit used to determine the delay of each digital delay line. The delay of the lines are set in such a way as to produce two vectors with the desired phase shift that, when summed together, produce a vector with the desired phase and amplitude characteristics.

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