A 4GHz temperature compensated CMOS ring oscillator for impulse radio UWB

This paper presents a voltage controlled ring oscillator (VCO) with a simpler temperature compensation circuit to produce a stable 4 GHz oscillation frequency. The proposed temperature compensation circuit is able to achieve a 89.25 % reduction in the variation of the center frequency of the uncompensated VCO and 108 ppm/°C temperature stability. Simulations using TSMC 0.18 µm CMOS technology show a low phase noise of a −74.55 dBc/Hz at 1 MHz offset from the carrier and a total power consumption of 11.06 mA. Therefore, the proposed oscillator system is suitable for the impulse radio ultra wide band (IR-UWB) wireless communication system.