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基于磁通门传感器的二次谐波选择法原理,采用0.6μm,N-well标准模拟CMOS工艺,设计并实现了磁通门传感器专用集成电路接口(ASIC)。这种集成磁通门接口电路能够减小传统分立元件接口电路的体积,降低系统能耗,满足航天、军事等领域的微型化、低功耗需求。在分析磁通门传感器结构和特点的基础上,完成了激励电路及检测电路的设计,芯片面积为2.0mm×2.0mm,并采用HSPICE对电路各部分功能及其指标进行验证。对与微型磁通门探头集成的电路系统进行了测试,结果表明,当测量范围为±90μT时,灵敏度可达16.5mV/μT;在5V电源电压下,其功耗为35mW。
Based on the principle of second harmonic selection of fluxgate sensor, 0.6μm, N-well standard analog CMOS technology was used to design and implement the ASIC of the fluxgate sensor. The integrated fluxgate interface circuit can reduce the volume of the traditional discrete component interface circuit, reduce the system energy consumption, and meet the miniaturization and low power consumption requirements in the fields of aerospace and military. Based on the analysis of the structure and characteristics of the fluxgate sensor, the design of the excitation circuit and detection circuit is completed. The chip area is 2.0mm × 2.0mm, and the function of each part of the circuit and its index are verified by HSPICE. The circuit system integrated with the micro fluxgate probe was tested and the results show that the sensitivity is up to 16.5mV / μT with a measurement range of ± 90μT and 35mW at 5V supply voltage.