Hardware-efficient phase-to-amplitude mapping design for direct digital frequency synthesizers

摘要

A hardware-efficient mapping circuit uses a controller to down select signed shift values from the control signal (MSBs) for a particular phase angle. Shifter blocks shift the data signal (LSBs) by the respective shift values. The shifted data signals are added/subtracted from a base value decoded from the control signal to approximate a sinusoidal amplitude for the phase angle. Down selection by a controller allows the shifter blocks to be implemented with narrow band multiplexers, which conserves both chip space and power.