Research on Influence of PCB Parameters on Low Noise Amplifier Circuit Performance of Ultra-high Frequency Partial Discharge
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.
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