A quadrature VCO with +/- 50% tuning continuous tuning range is presented. It is based on a core LC-QVCO with +/- 20% tuning range, a single sideband mixer, two frequency dividers and a multiplexer. The circuit has been implemented in a 0.13 um 1.2 V CMOS technology. The additional area with respect to the core LC-QVCO is 100x100 um. Quadrature error is less than 2°; the phase noise is less than -120 dBc/Hz @ 1 MHz offset over the whole tuning range and is mainly due to the LC-QVCO. Spurs are more than 34 dB below the fundamental in the worst case.
D. Guermandi, P. Tortori, E. Franchi Scarselli, A. Gnudi (2005). A 0.83-2.5 GHz Continuously Tunable Quadrature VCO. IEEE JOURNAL OF SOLID-STATE CIRCUITS, 40, 2620-2627 [10.1109/JSSC.2005.857427].
A 0.83-2.5 GHz Continuously Tunable Quadrature VCO
GUERMANDI, DAVIDE;TORTORI, PAOLA;FRANCHI SCARSELLI, ELEONORA;GNUDI, ANTONIO
2005
Abstract
A quadrature VCO with +/- 50% tuning continuous tuning range is presented. It is based on a core LC-QVCO with +/- 20% tuning range, a single sideband mixer, two frequency dividers and a multiplexer. The circuit has been implemented in a 0.13 um 1.2 V CMOS technology. The additional area with respect to the core LC-QVCO is 100x100 um. Quadrature error is less than 2°; the phase noise is less than -120 dBc/Hz @ 1 MHz offset over the whole tuning range and is mainly due to the LC-QVCO. Spurs are more than 34 dB below the fundamental in the worst case.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
