基于FPGA的能量倍增器相位翻转系统的研制

介绍了基于可编程逻辑门阵列(FPGA)的能量倍增器(SLED)相位翻转系统。该系统主要由微波IQ调制器、FPGA和高速DAC组成。在FPGA的控制下,DAC输出两路双极性脉冲电平信号,加载于调制器的IQ端,将微波连续波输入信号转变为4μs脉冲输出信号,并且在3μs时刻微波相位发生180°跳变。经测试,相位翻转精度为180°±2°,翻转相位的长期稳定度优于±0.5°;相位翻转系统驱动的6台SLED的输出功率增益均超过7dB,最高达到7.54dB,增益的长期稳定度达到±0.1dB。

SLED phase reverse system based on FPGA

This paper introduces the phase reverse system designed for SLAC Energy Doubler (SLED) based on Field Programmable Gate Array (FPGA). The phase reverse system is composed of a microwave IQ vector modulator, a FPGA board with the high speed DAC unit. Modulated by the DAC output pulse signal, the IQ modulator transforms the RF CW input signal into 4 s pulse output signal, whose phase is reversed to 180 at the moment of 3 s. The test results show that the phase reversal accuracy is about 1802, and the stability is better than 0.5. The RF power gains of six SLEDs are more than 7 dB, the maximum 7.54 dB is achieved. The long-term variation of the power gain is 0.1 dB.