Highly stable MI micro sensor using CMOS IC multivibrator with synchronous rectification [for automobile control application]

A new highly stable magneto-impedance (MI) micro magnetic sensor with a pair of zero-magnetostrictive amorphous wires is presented. The sensor picks up a first pulse in an induced oscillatory pulse voltage at a wire coil using an analog switch. High temperature stability in the MI sensor is established in which zero drift for temperature variation from 20/spl deg/C to 80/spl deg/C is 0.6%/FS (0.01.%/FS/spl deg/C). The highly stable MI sensor will be useful for application to automobile controls.