Abstract
This paper presents a MEMS-based real time clock with a temperature compensation system. The implemented circuit achieves a timekeeping accuracy of ±4 ppm over -40 °C... 85 °C temperature range. It is built using a 27 kHz silicon resonator, differential PTAT temperature sensor with a 2 nd order ΣΔADC, and a DSP block for temperature frequency compensation. The circuit is powered by a 1.8V supply and draws 2 μA current. The system has been implemented using a 0.18 μm CMOS process.
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