The design of signal generator using MAX038 as a core chip and controlled by single chip AT89S51 to realize adjustment of frequency and amplitude is introduced. The realization of frequency control is to convert the digital quantity of sin⁃gle chip into analog quantity through DAC0832. The realization of amplitude control is to control the sliding⁃end position of digi⁃tal potentiometer X9C103 by single chip after the signal is amplified by operational amplifier OPA604. The output waveform type,frequency,amplitude and amplitude step value are set by 4 × 4 keyboard. The real⁃time display of every set value is achieved by LCD1602A. The testing result indicates that the system runs stable and its effect is better.% 介绍了一种以MAX038为核心芯片，由单片机AT89S51控制实现的频率和幅度可调的信号发生器的设计。其中频率控制是通过DAC0832将输入到单片机的数字量转换成模拟量，对电流控制来实现的。幅度控制是通过运放OPA604进行信号放大后，由单片机控制数字电位器X9C103滑动端位置来完成的。通过4×4键盘设定输出波形类型、频率、幅度和幅度步进值，同时采用LCD1602A完成各设定值的实时显示。经测试，该系统运行稳定，效果良好。
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