公开(公告)号：US20060136537A1

公开(公告)日：2006-06-22

申请号：US11289783

申请日：2005-11-30

申请人： Jeffrey Meckley ,  Thomas McGrath ,  William McClelland ,  Robert Baummer

发明人： Jeffrey Meckley ,  Thomas McGrath ,  William McClelland ,  Robert Baummer

IPC分类号： G06F1/02

CPC分类号： G06F1/0335 ,  G01C21/3611 ,  G01C21/3614 ,  G01C21/3617 ,  G08G1/096861 ,  G08G1/0969

摘要： A phase persistent agile signal source method, apparatus, and/or computer program product provides a direct digital synthesizer (DDS) clock rate, provides a frequency tuning word (FTW) for a desired output frequency, provides a DDS update for a desired DDS update rate, provides an equivalent frequency least significant bit (LSB) for the desired DDS update rate, provides a current phase of an LSB accumulator, and generates a coherent phase of the desired output frequency based on the DDS clock rate, FTW, DDS update rate to the DDS, equivalent LSB for the desired DDS update rate, and current phase of the LSB accumulator. The coherent phase can be the fraction portion of the result obtained from the multiplication of the FTW and the current phase of the LSB accumulator.