A 45µW, 9.5MHz current-reused RC oscillator using a swing-boosting technique

This paper presents a differential relaxation oscillator that uses swing-boost and current-reused techniques. Output swing boosting is adopted to improve noise performance, and current-reused architecture reduces the power consumption of the oscillator. Since oscillation frequency is defined by the resistor and capacitor, combining opposite temperature coefficient resistors helps eliminate temperature-caused frequency drifts. The proposed RC oscillator is fabricated using 0.18 urn standard CMOS technology. The design achieves an FOM of 161.5 dBc/Hz with a phase noise of −108.5 dBc/Hz at 100kHz offset and an Allan deviation floor of 5.2 ppm at a 2-second integral window while consuming 45 µW. The measured temperature coefficient is 307 ppm/°C in the temperature range of −20–100 °C, and the measured period jitter is 10.5 psrms.

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