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A fully-integrated low-power low-noise 2.6-GHz bipolar VCO for wireless applications

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4 Author(s)
Samori, C. ; Dipartimento di Elettronica ed Inf., Politecnico di Milano, Italy ; Zanchi, A. ; Levantino, S. ; Lacaita, A.L.

The low quality factor of the inductors fabricated in fully-integrated LC tanks results in a poor indirect stability of the oscillators, which are therefore highly sensitive to low-frequency noise and disturbances coupled through substrate and supply lines. The paper addresses the design of a 2-V voltage-controlled oscillator (VCO) at 2.6 GHz fabricated in a Si-bipolar process with f/sub T/ of 20 GHz. The circuit bias and the transistor layout have been specifically optimized to minimize the phase noise degradation due to the intrinsic low indirect stability. A single sideband-to-carrier ratio (SSCR) of -104 dBc/Hz at 100 kHz is demonstrated with less than 14 mW power consumption.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:11 ,  Issue: 5 )