Naslov
A 1-MHz Relaxation Oscillator Core Employing a Self-Compensating Chopped Comparator Pair

Autori
Mikulić, Josip ; Schatzberger, Gregor ; Barić, Adrijan

Izvornik
IEEE Transactions on Circuits and Systems I: Regular Papers (1549-8328) 66 (2019), 5; 1728-1736

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
oscilator ; relaksacijski ; temperaturni koeficijent ; kompenzacija ; kašnjenje komparatora
(oscillator ; temperature coefficient ; compensation ; comparator delay)

Sažetak
An improved relaxation oscillator core is designed and fabricated in 0.35-μm CMOS process, occupying the area of 0.032 mm 2 and consuming around 160 μW while running at 1 MHz. Employing a self-compensating chopped comparator structure, the designed oscillator exhibits a significant improvement in the frequency stability and control linearity, at the same time retaining a fast start-up and having a minimal overhead in the power consumption and area. Measured on 8 test chips, the frequency variation against temperature is ±0.26% in the temperature range from -40 to 125 °C, and the line sensitivity is ±0.08 %/V with the supply voltage changing from 3.0 to 4.5 V. The typical distortion parameters of the control characteristic are HD 2 = -61.7 dB and HD 3 = -93.2 dB at △f osc = 500 kHz. The measured jitter and phase noise at 10 kHz carrier offset are 235 ppm and -92 dBc/Hz, respectively, while the Allan deviation floor is 15 ppm.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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