Direct digital frequency synthesizer for use in a subscriber uni

Details Direct digital frequency synthesizer for use in a subscriber uni Direct digital frequency synthesizer for use in a subscriber uni

1995-05-22

1997-07-01

Tse, Young T.

Pulse or digital communications

Transmitters

Angle modulation

364712, 327106, G06F 1035, H04L 2720

Patent

active

056446020

ABSTRACT:
A digital frequency synthesizer for use in a subscriber unit of a wireless digital communication system includes a processor, for providing an output phase signal corresponding to a selected output digital frequency a storage device having predefined stored values pertaining to the amplitude of a signal for a single quadrant, and a signal generator which receives the phase signal and generates sine and cosine waveforms utilizing amplitude values obtained from the lookup tables. The signal generator accesses the storage device differently depending upon the quadrant and sign of the phase data such that the storage device provides an amplitude value from said set of values based upon the phase data.

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