【摘要】 提出了一种新的矩形波数字设计方法—余数插补比较法 ,它以微处理机为核心 ,运用余数插补和数字比较能自动地实现矩形波信号的频率、占空比的步进可调 ,详细介绍了其设计思想、电路原理、误差分析及 VHDL设计仿真 ,还介绍了以 CPL D为数字核采用此法 ,在 PC机的控制下产生频率 1Hz～ 1MHz、步进 1Hz、频率准确度 10 - 3,周期准确度 2 .1% ,占空比 2 %～ 98%、步进 2 %、占空比准确度 1%的矩形波的实验系统设计及实验结果。仿真与实验表明本方法是有效和切实可行的。更多还原

【Abstract】 A new digital design method of rectangle wave using remainder inserted and cancelled and comparison which used microcomputer for the kernel was presented, by which rectangle wave whose frequency, duty cycle could be adjusted in some steplength could be generated automatically in remainder’s insertion cancel and digital comparison. Its design thought, circuit principle, error analysis, VHDL design and imitation were given in detail. Experiment system design and experiment result were also introduced, the system was controlled by PC in which CPLD was digital kernel and could generate rectangle wave whose frequency changes from 1Hz to 1MHz with the 10 -3 frequency accuracy, 2.1% cycle accuracy and 1Hz stepping, duty cycle from 2% to 98% with the 1% accuracy and 2% stepping, imitation and experiments showed the method was effective and feasible.更多还原