Gierkink, S.L.J., Levantino, S., Frye, R.C., Samori, C. and Boccuzzi, V. (2003) A Low-Phase-Noise 5-GHz CMOS Quadrature VCO Using Superharmonic Coupling. IEEE Journal of Solid-State Circuits, 38, 1148-1154.
http://dx.doi.org/10.1109/JSSC.2003.813297

has been cited by the following article:

• TITLE: CMOS Phase and Quadrature Pulsed Differential Oscillators Coupled through Microstrip Delay-Lines

  AUTHORS: Francesco Stilgenbauer, Stefano Perticaroli, Fabrizio Palma

  KEYWORDS: Voltage Controlled Oscillator, Microstrip, Delay-Line, Phase and Quadrature, Phase Noise

  JOURNAL NAME: Circuits and Systems, Vol.5 No.8, August 8, 2014

  ABSTRACT: An innovative solution to design phase and quadrature pulsed coupled oscillators systems through electromagnetic waveguides is described in this paper. Each oscillator is constituted by an LC differential resonator refilled through a couple of current pulse generator circuits. The phase and quadrature coupling between the two differential oscillators is achieved using delayed replicas of generated fundamentals from a resonator as driving signal of pulse generator injecting in the other resonator. The delayed replicas are obtained by microstrip-based delay-lines. A 2.4 - 2.5 GHz VCO has been implemented in a 150 nm RF CMOS process. Simulations showed at 1 MHz offset a phase noise of -139.9 dBc/Hz and a FOM of -189.1 dB.