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 ?20C to 80C, is0.6% 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 ? W and the active area is 0.09mm2. The proposed oscillator is implemented in a 0.18 ? m CMOS process and the simulation results are shown.
oscillator temperature compensated frequency supply voltage compensated frequency low-power