【摘要】 采用DDS芯片AD9851,产生1 kHz~10 mHz范围、频率步进100 Hz可调、输出峰峰值在6 V的正弦波基本信号.以AVR单片机Atmega16为控制核心,结合FPGA辅助逻辑控制电路(产生1 kHz的正弦调制信号和二进制基带序列信号),对实现的正弦波基本信号进行幅度、频率、相位调制和调制度及频偏的程序控制.该设计具有频带宽、精度高、性能稳定、成本低和操作界面友好等特点.可作为教具和科研用仪器.更多还原

【Abstract】 The design use DDS chip AD9851 to generate sine wave,whose frequency is from 1 Hz to 10 MHz,frequency stepper is 100 Hz and peak value is around 6 V. It use AVR MCU Atmega 16 as the control unit.MCU combine with assistant logic control circuit with FPGA which generate sin modulated signal of 1 kHz frequency and binary baseband serial signal to control the peak,frequency,phase,modulate coefficient and frequency stepper of sine wave with program.It has the virtue of wide baseband,high precision,stabilization,low cost and fine interface.The production can use as realia and scientific research instrument.更多还原