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Fully integrated 5.35-GHz CMOS VCOs and prescalers

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4 Author(s)
Chih-Ming Hung ; Florida Univ., Gainesville, FL, USA ; Floyd, B.A. ; Park, N. ; Kenneth, K.O.

Two 5.35-GHz monolithic voltage-controlled oscillators (VCOs) and two prescalers have been fabricated in a digital 0.25-μm CMOS process. One VCO uses p+/n-well diodes, while the other uses MOS varactors, Q of 57 at 5.5 GHz and 0 V bias (low-Q condition) for a p +/n-well varactor has been achieved. For an MOS varactor, it is possible to achieve a quality factor of 140 at 5.5 GHz. The tuning ranges of the VCOs are >310 MHz, and their phase noise is <-116.5 dBc/Hz at a 1-MHz offset while consuming ~7 mW power at VDD=1.5 V. The low phase noise is achieved by using only PMOS transistors in the VCO core and by optimizing the resonator layout. The prescalers utilize a variation of the source-coupled logic. The power consumption is 4.1 mW at 1.5-V VDD and 5.4 GHz. By widening the transistors in the first three divide-by-two stages, the maximum operating frequency is increased to 9.96 GHz at VDD=2.5 V

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:49 ,  Issue: 1 )

Date of Publication:

Jan 2001

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