基于FPGA的K波段VCO宽带线性校正

Linearity Correction of K-band VCO Broadband Based on FPGA

为解决K波段宽带线性校正器件复杂、成本高、调试难等问题,提出了一种基于FPGA的VCO开环线性校正方法。利用VCO电调特性的开环线性校正原理,采用FPGA控制D/A芯片对VCO的电调特性进行开环宽带线性校正,同时通过控制FPGA产生的时钟,产生任意时宽的线性调频连续波,并进行试验测试。测试结果表明:在带宽为400 MHz时的非线性度小于0.1%,开环线性校正实现方案简单、成本小,满足系统指标要求。

In order to solve the problems of complex, high cost, and difficult debugging of K band wideband linear correction device, a VCO open loop linear correction method based on FPGA is proposed. With VCO tuning characteristics of the open loop linear correction principle, we can make open loop broadband linear correction for the VCO tuning characteristics on the basis of the D/A chip controlled by FPGA. At the same time, the clock generated by controlling FPGA can generate arbitrary wide linear frequency modulation continuous wave and carry out experiments. Experiment results show that, when bandwidth is 400 MHz, the nonlinear is less than 0.1%, the open loop linear correction method is simple, low cost and satisfies the system index requirements.