Title :
A pre-distortion method to reduce DDS spurious
Author :
Delos, Peter L. ; Leonard, Douglas A. ; Spada, Joseph M.
Author_Institution :
Lockheed Martin Corp., Moorestown, NJ, USA
Abstract :
We present a pre-distortion method for suppression of direct digital synthesizer (DDS) spurious. The method has been implemented in a field programmable gate array (FPGA) architecture with the FPGA generating the DDS waveform and controlling a high speed digital to analog converter (DAC). A generic approach is provided, followed by a detailed example. Measured data will be shown for a continuous wave (CW) case and a linear frequency modulated (LFM) waveform. It will be demonstrated that a practical calibration can achieve over 20dB spurious improvement.
Keywords :
digital-analogue conversion; direct digital synthesis; distortion; field programmable gate arrays; CW; DAC; DDS spurious reduction; DDS waveform; FPGA architecture; LFM; continuous wave; direct digital synthesizer; field programmable gate array; high speed digital to analog converter; linear frequency modulated waveform; pre-distortion method; Bit rate; Calibration; Chirp; Clocks; Field programmable gate arrays; Standards; Table lookup; DDS; cancellation; predistortion; spurious;
Conference_Titel :
Microwave Symposium (IMS), 2014 IEEE MTT-S International
Conference_Location :
Tampa, FL
DOI :
10.1109/MWSYM.2014.6848239
