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

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