An inductorless CMOS quadrature oscillator continuously tuneable from 3.1 to 10.6 GHz
International Journal of Circuit Theory and Applications
Analytic model for spread-spectrum clock generator circuit characterization
International Journal of Circuit Theory and Applications
A 120–420 MHz delay-locked loop with multi-band voltage-controlled delay unit
International Journal of Circuit Theory and Applications
Time-domain analysis of phase-noise and jitter in oscillators due to white and colored noise sources
International Journal of Circuit Theory and Applications
A 5GHz LC-VCO frequency synthesizer for unlicensed band of WiMAX
Expert Systems with Applications: An International Journal
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A novel fully integrated CMOS LC tank VCO is presented. The LC tanks are implemented by exploiting the active circuit ‘boot-strapped inductor’ (BSI), which behaves like a high-quality factor inductor. Particularly, the LC tanks have been implemented by introducing a new version of the CMOS BSI circuit, which provides better versatility and design reliability. In order to verify the effectiveness of such an approach, a case study for 5–6 GHz direct-conversion multi-standard WLAN transceivers is presented. The VCO has been designed in a 0.35µm standard CMOS technology. The new BSI exhibits a high-quality factor (higher than 25 over the all frequency range) and provides a high selectivity without introducing a relevant excess of noise, for a better spectral purity and a lower phase noise (PN) of the VCO. The overall VCO circuit consumes 9 mW. The VCO produces an oscillation in the tuning range from 4.91 to 5.93 GHz (nearly equal to 19%). The circuit exhibits a PN of -129dBc-Hz at 1 MHz of frequency offset from the central frequency (5.4 GHz) and a FOM equal to 189.5 dBc-Hz at 100 kHz and 194.1 dBc-Hz at 1 MHz of frequency offset, respectively. Copyright © 2009 John Wiley & Sons, Ltd.