PCB参数对特高频局放低噪放大电路性能影响的研究
Research on Influence of PCB Parameters on Low Noise Amplifier Circuit Performance of Ultra-high Frequency Partial Discharge
陈泽奇 1张一锋 1陈非凡1
作者信息
- 1. 清华大学,精密测试技术及仪器国家重点实验室
- 折叠
摘要
在变电设备特高频局部放电监测系统设计中,测量转换电路的设计难点在于低噪放大电路PCB传输线上会发生信号损耗,导致电路实际性能无法达到预期.文中分析了PCB各主要电路参数与金属底板共面波导传输线特征阻抗之间的理论关系,通过对可能影响信号传输质量的电路PCB参数进行建模和仿真测试得到了对应的影响特性,形成了针对特高频局部放电信号低噪放大电路的设计规则,并依此实现了在300～1 500 MHz的信号频段内具有稳定高增益的双通道低噪放大电路优化设计.实验结果表明:优化后的电路各通道在整个信号频段内的实测增益特性均能够保持在 17.4～18.3 dB,理论误差小于0.7 dB.
Abstract
In the design of ultra-high frequency partial discharge monitoring systems for substation equipment,the difficulty of measurement and conversion circuit design lies in the signal loss on the PCB transmission line of low noise amplifier circuit,which leads to the actual performance of the circuit cannot reach the expectation.This paper analyzed the theoretical relationship between the main circuit parameters of PCB and the characteristic impedance of the conductor-backed coplanar waveguide,and the influence characteristics of each parameter that may affect the signal transmission quality in PCB were obtained by modeling and simulation testing.A design rule of low noise amplifier circuit for ultra-high frequency partial discharge signal was formed,and according to this,an optimized design of dual-channel low noise amplification circuit with stable and high gain in the signal band of 300～1 500 MHz was realized.The experimental results show that the measured gain of each channel of the optimized circuit can be maintained between 17.4 dB and 18.3 dB throughout the entire signal band,and the theoretical error is lower than 0.7 dB.
关键词
变电设备/局部放电/特高频/低噪放大/PCB参数Key words
substation equipment/partial discharge/ultra-high frequency/low noise amplifier/printed circuit board parameter引用本文复制引用
出版年
2024
NETL
NSTL
万方数据