【摘要】 设计产生可预置数据的阶梯状的方波信号源,且此阶梯波各段的幅度和宽度可通过键盘实时调整。本系统主要利用小键盘、单片机AT89C51和复杂可编程逻辑器件进行设计。软件分别用C51和VHDL语言编程,结构紧凑、体积小、键盘操作灵活。更多还原

【Abstract】 The signal generator is introduced and is used to produce a square wave, which is similar as ladder and could be set beforehand. The signal’s scope and width could be easily adjusted through the keyboard in real-time. The system utilizes small keyboard microprocessor AT89C51 and complex logic device (CPLD).The software program is written by C language and VHDL language,respectively. The system construction is compact and the volume is sma1l, and the keyboard operation is flexible and convenient.更多还原