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本文提出一种自动调谐陷波器,其陷波中心频率自动跟踪市电频率或某一外加干扰频率,以抑制其干扰.陷波器的谐振电路由LC组成,而电感L是用普遍阻抗转换器(GIC)来实现,GIC的端接电阻为压控MOS管电阻,因此可以用一电压控制此电阻以改变电感值,进而控制陷波频率.这种陷波电路可用于抑制市电频率的干扰噪声并防止测量或数据采集系统中前置放大器的饱和.实验结果表明在频率从45—55Hz,其陷波频率跟踪精度优于0.5Hz,而陷波深度(串模抑制比)为30—40dB.
In this paper, an auto-tuning notch filter is proposed, whose notch center frequency automatically tracks the frequency of commercial power or some additional interference frequency to suppress its interference.The resonant circuit of the notch filter is composed of LC, and the inductance L is converted by universal impedance (GIC), the termination resistance of GIC is the voltage-controlled MOS tube resistance, so a voltage can be used to control the resistance to change the inductance to control the notch frequency.This notch circuit can be used to suppress the mains frequency Interfere with the noise and prevent saturation of the preamplifier in the measurement or data acquisition system.The experimental results show that the tracking accuracy of the notch frequency is better than 0.5Hz and the notch depth (SCR) is 30- 40dB.