【摘要】 由于CCD(Charge Coupled Devices)芯片价格昂贵而且极易损坏,本文提出了一种利用CPLD和D/A转换器构成的信号发生器的原理方案和实现方法。通过对CPLD器件isp1032e和D/A转换器件DAC2900的配置,频率为l1MHz的模拟CCD信号,同时通过改进PCB设计和滤波电路,提高了输出信号的精度,降低了噪声。本设计具有可编程、宽频、高精度和低硬件复杂度等特点。更多还原

【Abstract】 The CCD chips are very expensive and easy to be damaged.This paper presents the design of a signal generator based on CPLD isp1032e and D/A device DAC2900,the frequency of signal is 11 MHz.The signal has high accuracy and low noise owing to the improvement on the PCB and filter circuit.This design has such characteristics as programmable, wide in frequency range ,high accuracy and low in hardware complexity, etc.更多还原