大反射负载牵引测量系统校准参数优化选取及应用

Selection and Application of Calibration Parameter Optimization for Traction Measurement System with Large Reflective Load

相对于传统负载牵引测量系统,大反射负载牵引测量系统可以对微波功率放大器件的负载阻抗端实现更大的调配范围,成为目前比较流行的测量方案。对大反射负载牵引测量系统的验证,一般选择转换功率增益作为负载牵引测量系统优化验证参数。通过对比功率增益和转换功率增益的理论值和测量值的偏差,认为在大反射条件下,功率增益对系统校准后的剩余误差更加敏感,对系统准确度优化提升效果更好。最后通过功率优化的应用实验验证,在负载反射系数为0.9时,转换功率增益变化0.4 dB,而功率增益变化0.8 dB,因此,选取功率增益作为大反射优化校准参数效果更明显,而在小反射系数下可选择转换功率增益作为负载牵引测量系统验证参数。

Compared with traditional load-pull measurement systems,the active hybrid load-pull measurement system can achieve a larger load impedance adjustment range for microwave power amplifier device testing,which has become a popular measurement solution.For the verification of active hybrid load-pull measurement system,the transducer gain is generally selected as the optimization verification parameter of the load traction measurement system.By comparing the deviation between the theoretical value and the measured value of the power gain and the transducer gain,it is observed that under large reflection conditions,the power gain is more sensitive for the residual error after system calibration,and the effect of optimizing and improving the system accuracy is better.Finally,it is verified by the application experiment of power optimization,it is observed that when the load reflection coefficient reaches 0.9,the transducer gain changes 0.4 dB,whereas the power gain changes 0.8 dB.Therefore,the effect of selecting the power gain as a large reflection optimization calibration parameter is more obvious.However,under a small reflection coefficient,the transducer gain can be selected as the verification parameter of the load traction measurement system.