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相位和幅度测量是BEPCⅡ直线加速器相控系统中最重要的部分之一．基于模拟和数字I／Q解调器,构建了两种PAD,并分别在实验室和速调管长廊进行了测试．基于LMS方法的校准算法用于补偿模拟I／Q解调器的各种不匹配误差．实验证明,两种PAD都能正常稳定地运行,可以满足相控系统对相位和幅度测量的要求．
Phase and amplitude measurement is one of the most important parts of the BEPC II linear accelerator phase control system. Based on the analog and digital I / Q demodulators, two PADs were built and tested in the lab and klystron galleries respectively. The calibration algorithm based on the LMS method is used to compensate for various mismatch errors of the analog I / Q demodulator. Experiments show that both PADs can operate normally and stably to meet the phase and amplitude measurement requirements of the phase control system.