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A magnetic-field sensor system integrated in CMOS technology with additional processing steps necessary for sensor fabrication is presented. The system contains a permalloy magnetoresistive microbridge acting as sensor, temperature compensation circuitry, readout electronics, reference voltage bias, and clock generation.
A bandgap reference circuit which operates at supply voltages down to 1.2V is presented. It offers a reference voltage of 82mV and a reference current of 2??A with a temperature dependence of less then 100ppm/K in a temperature range form ??40??C to 120??C. The power supply rejection is enhanced by self biasing the circuit with the reference current. The circuit has been fabricated in a standard 1...
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