FULLY-INTEGRATED 2.4GHz VCO WITH LOW PHASE-NOISE

This paper presents a fully-integrated voltage controlled oscillator working in the 2.45GHz ISM band. It uses the standard differential design as it gives major advantages – high suppression of noise on the power supply lines, better start-up for a given power consumption. The oscillator achieves very low phase noise of-123dBc/Hz at 1MHz offset from the carrier. Emitter degeneration technique is used to improve the phase noise over the standard design. The power consumption of the oscillator is 8mA from a 3V power supply. The output voltage amplitude is 800mV. The tuning frequency range is 2.38-2.68GHz and the tuning voltage is from 2V to 3 V. 1