基于DDS的超声换能器频率跟踪系统.pdf

315 　　　　 Vol.31 No.5 200910 PIEZOELECT RICS ACOUST OOPTICS Oct.2009 :1004-2474(2009)05-0692-03 　　 DDS 1 2 1 1 李小雪, 汪　东 , 李　平, 肖　灵 (1. , 100190;2., 100190) 　　　:。 (DDS) ;(CPLD)DDS , ; , , , 。 , 。 :;;(DDS);(CPLD) :TN3;TB552;TP272　　　:A Frequency Tracing System for Piezoelectric Transducer Based on DDS 1 2 1 1 LI Xiao-xue , WAN Dong , LI Ping , XIAOLing (1.Institute of Acoustics, Chinese Aca em y of Sciences, Beijing 100190, China; 2.Beijing Ometech Technology Co., Lt ., Beijing 100190, China) 　　Abstract:A frequency tracing system for the piezoelectric trans ucer has been esigne an implemente .This system utilizes the irect igital synthesizer (DDS)to a just the frequency an generate riving signal.CPLD is use to etect the phase ifference an to cont rol DDS, thus the high response spee of the frequency tracing is achieve . The micro control unit(M CU)is use as the control center of the system to monitor the fee back current in real time.Base on, a strategy of sw eeping frequency before tracing an an unlock function have been realize , thus makes the system a aptable an reliable.This system has been use in the prototype of a practical piezoelectric trans- ucer an show s goo performance. 　　Key words:frequency t racing;piezoelectric t rans ucer;DDS;CPLD 　 　　 , ; [ 1] , 。 , 。 , , , , 。 , 。 , 。 、 1　本文提出的频率跟踪系统