【摘要】 本文介绍了一种以微机仪器（个人仪器）思想设计的Apple微型计算机函数发生器卡,它利用了锁相原理和频率合成技术,大大地改善了低频信号发生器（或函数发生器）的频率精度差的缺点,使频率精度从通常的10^-2提高到10^-4。更多还原

【Abstract】 A function generator card for Apple-II based on microcomputer instrument design is presented in this paper and its control method displayed in detail By employing the PLL principle and frequency synthesizing technique. the frequency precision is improved greatly, and thus, raised from the usual 10^-2 up to 10^-4.更多还原