A low-power temperature-compensated relaxation oscillator for built-in test signal generation

Liu, Xü; Onabajo, Marvin

doi:10.1109/mwscas.2015.7282022

Cited by 7 publications

(1 citation statement)

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“…Hence, it may not be suitable for providing a stable clock using the standalone ring oscillator topology. Several reported works [7][8][9][10][11] have shown that the relaxation oscillator can provide a good tradeoff between frequency stability, temperature variation, and supply variation while occupying at reasonably small area. Thus, the relaxation oscillator is preferred as on-chip oscillator for those applications that require good stability with low cost and moderate precision.…”

Section: Introductionmentioning

confidence: 99%

A 1.1 V 25 ppm/°C Relaxation Oscillator with 0.045%/V Line Sensitivity for Low Power Applications

Liao

Chan

2023

JLPEA

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A fully-integrated CMOS relaxation oscillator, realized in 40 nm CMOS technology, is presented. The oscillator includes a stable two-transistor based voltage reference without an operational amplifier, a simple current reference employing the temperature-compensated composite resistor, and the approximated complementary to absolute temperature (CTAT) delay-based comparators compensate for the approximated proportional to absolute temperature (PTAT) delay arising from the leakage currents in the switches. This relaxation oscillator is designed to output a square wave with a frequency of 64 kHz in a duty cycle of 50% at a 1.1 V supply. The simulation results demonstrated that the circuit can generate a square wave, with stable frequency, against temperature and supply variation, while exhibiting low current consumption. For the temperature range from −20 °C to 80 °C at a 1.1 V supply, the oscillator’ output frequency achieved a temperature coefficient (T.C.) of 12.4 ppm/°C in a typical corner in one sample simulation. For a 200-sample Monte Carlo simulation, the obtained T.C. is 25 ppm/°C. Under typical corners and room temperatures, the simulated line sensitivity is 0.045%/V with the supply from 1.1 V to 1.6 V, and the dynamic current consumption is 552 nA. A better figure-of-merit (FoM), which equals 0.129%, is displayed when compared to the representative prior-art works.

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