论文部分内容阅读
传统磁通门信号处理电路中的选频放大电路由运放和电阻电容网络构成的多环反馈型带通滤波器组成,具有电路结构简单、可靠性高、成本低等特点。但电路中电阻、电容的值较大,不易集成。基于将磁通门传感器微型化的目的,在已有Hspice磁通门探头信号产生模型的基础上,提出一种由双2阶模块级联的开关电容带通滤波器实现选频放大功能的方法,运用互补开关技术和动态范围定标技术,提高了滤波器的精度。在3V供电电压下,利用Hspice进行仿真验证,结果表明:设计的开关电容带通滤波器,其中心频率约为2.2kHz,增益约为15dB,能较好地对磁通门传感器中的2次谐波进行选择并放大。
The frequency selective amplifier circuit in the traditional fluxgate signal processing circuit is composed of a multi-loop feedback type band-pass filter formed by an op amp and a resistor-capacitor network, which has the advantages of simple circuit structure, high reliability and low cost. However, the circuit resistance, capacitance larger, not easy to integrate. Based on the existing signal generation model of Hspice fluxgate, a method to realize the function of frequency selection amplification by double-stage module cascaded switched-capacitor band-pass filter is proposed based on the purpose of miniaturizing fluxgate sensor. , The use of complementary switching technology and dynamic range calibration technology to improve the accuracy of the filter. Under 3V supply voltage, Hspice simulation results show that the designed switched-capacitor band-pass filter has a center frequency of about 2.2kHz and a gain of about 15dB. Harmonic selection and amplification.