AMPLITUDE AND PHASE MODULATION USING DUAL DIGITAL DELAY VECTORS

摘要

The present invention provides a means to implement amplitude and phase modulation digitally and directly at an RF frequency that benefits fro m high output power using non-linear an 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 update d by the vector control circuit used to determine the delay of each digital delay lin e. 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.