论文部分内容阅读
介绍了一种利用单片机控制技术的8通道同步宽带信号源设计方法,该信号源可用于产生三维空间平面内旋转磁场,以满足多相位复杂生物系统试验和新型生物芯片及传感器的开发。8通道可调相位的高精度频率信号源由DDS芯片AD9959发生。多片DDS芯片同步后,在标准50Ω负载下,经过三级放大实现100Hz～100MHz带宽输出,并通过引入幅值检测和相位同步控制负反馈,实现变负载后信号源稳频、稳幅和恒相位差输出。
An 8-channel synchronous broadband signal source design method using single-chip control technology is introduced. The signal source can be used to generate rotating magnetic field in three-dimensional space to meet the requirements of multiphase complex biological system and the development of novel biochips and sensors. The 8-channel, adjustable-phase, high-precision frequency source occurs on the D99 chip AD9959. Multi-chip DDS chip synchronization, the standard 50Ω load, after three amplification to achieve 100Hz ~ 100MHz bandwidth output, and through the introduction of amplitude detection and phase synchronization control of the negative feedback to achieve variable load signal source frequency stabilization, stability and constant Phase difference output.