基于光纤传感的核信号读出方法中的调制驱动模块设计和实现

基于光相位调制的核信号读出方法将探测器信号调制进光纤中，并使用光纤作为模拟信号的传输介质。在该读出方案中，调制驱动模块负责载波信号的产生及放大，是该方案读出电子学系统的重要组成部分。为了产生低相位噪声，幅度大且幅度可调的载波信号，本工作提出了基于锁相环的载波产生电路和基于MMIC射频放大器的载波放大电路的设计方案，该方案结构简单，尺寸小，性能优异。对载波产生电路使用了ADIsimPLL仿真软件进行了环路滤波器的设计和仿真，同时也对载波放大电路使用ADS仿真软件进行了设计和仿真，并在实验室条件下进行了测试。测试结果表明，输出26 dBm载波信号相位噪声好于–110 dBc/Hz@100 kHz，能够用于信号解调。

Design and Implementation of Modulation Driver Module in the Nuclear Signal Readout Method Based on Optical Fiber Sensor

In the nuclear signal readout method of optical phase modulation, the detector signal is modulated into optical phase to be transmitted along an optical fiber. In this readout scheme, the Modulation Driver Module, which generates and amplifies the carrier signal, plays an important role in the readout electronics. In order to generate high and adjustable amplitude carrier signals with low phase noise, this paper proposes a carrier generation and amplification method based on PLL and MMIC RF amplifier respectively, which has adventages of simple structure, small size and excellent performance. To evaluate this method, the loop filter for the carrier generation circuit is designed and simulated with the ADIsimPLL simulation software. Meanwhile, the carrier amplification circuit is designed and simulated with the ADS simulation software. Furthermore, test results show that the phase noise of the output carrier signal with 26 dBm amplitude is better than –110 dBc/Hz@ 100 kHz, which can be used for signal demodulation well.