This study presents a two-stage ring voltage-controlled oscillator (VCO) for use in impulse-radio ultra-wideband (IR-UWB) applications. A systematic and efficient graphical optimization method was employed to find the optimal dimensions of the VCO which give a best performance. A good agreement was observed between the desired specifications and simulation results with regard to the optimum component size of the VCO circuit. The operation range of the VCO was extended to cover an ultra-wide tuning range of 176.6%. The phase noise was [Formula: see text]107.1[Formula: see text]dBc/Hz at 10[Formula: see text]MHz offset frequency from a carrier frequency of 4[Formula: see text]GHz. The power consumption of VCO was 7.41[Formula: see text]mW from a 1.8[Formula: see text]V supply voltage. A large tuning range, low power, and appropriate phase noise were obtained with the optimum components size obtained through the optimization method.
This paper presents a 4[Formula: see text]GHz low-power ring oscillator with supply and temperature compensation for use in impulse-radio ultra-wideband (IR-UWB) applications. Simulations using TSMC 0.18[Formula: see text][Formula: see text]m CMOS technology show that this configuration is able to achieve a 94.87% reduction in the variation of the center frequency of the uncompensated VCO and 25[Formula: see text]ppm/[Formula: see text]C temperature stability. Monte Carlo simulations have also been performed, and demonstrate a 3[Formula: see text] deviation of about 7.26%. The power for the proposed circuit is only 4.5[Formula: see text]mW at 27[Formula: see text]C.
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