A low-power, temperature and supply voltage compensated current starved ring oscillator

A low-power, 3.82MHz oscillator based on a feedback loop is presented. The oscillator does not need a stable current reference to obtain a stable frequency independent of voltage and temperature variations because of the usage of negative feedback. The frequency variation, in the temperature range from -20^oC to 80^oC, is+/-0.6% and it depends only on the temperature coefficient of the resistor R, while the reference current variations are -11%/+25% in the same temperature range. The oscillator power consumption is 5.1@mW and the active area is 0.09mm^2. The proposed oscillator is implemented in a 0.18@mm CMOS process and the simulation results are shown.