【摘要】 设计了基于正交解调和窄带滤波技术的信号处理电路,它使用模拟开关作为乘法器,实现解调,并使用一种性能优异的窄带滤波电路对解调结果进行滤波和放大.整个电路具有高增益、高灵敏度、强抗干扰能力、低成本等优点,可有效提高金属探测门的性能.更多还原

【Abstract】 This paper described the design of signal processing part circuit based on amplitude demodulation and narrowband filtering technology.A analog switch was used to demodulate and a high prerformance narrowband filter was used to process demodulation results.The whole design had many features, such as high gain, high sensitivity, high anti-jamming ability, low cost, and so on. It could improve the performance of walk through metal detector significantly.更多还原