A Design of 18 MHz Relaxation Oscillator with ±1 % Accuracy Based on Temperature Sensor

Abstract

In this paper, a Relaxation Oscillator with temperature compensation using BGR and ADC is presented. The current to determine the frequency of Relaxation Oscillator can be controlled. By adjusting the current according to the temperature using the code that is output from the ADC and BGR, was to compensate the output frequency of the temperature. It is fabricated in a 0.35 μm CMOS process with an active area of 240 μm x 210 μm. Current consumption is 600 μA from a 5 V and the rate of change of the output frequency with temperature shows about ±1 %.