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A TX VCO for WCDMA/EDGE in 90 nm RF CMOS

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5 Author(s)

A VCO is implemented in an RF 90 nm CMOS process and covers the frequency range 2.55-4.08 GHz. Drawing 19 mA from 1.2 V, the phase noise at 20 MHz frequency offset from a 3.7 GHz carrier is -156 dBc/Hz, meeting the phase noise requirement for GSM/EDGE and SAW-less WCDMA transmitter after frequency division by 2 or by 4. A second version of the VCO covers an additional 4.90-5.75 GHz range, at the expense of a higher phase noise in the added band. In this way, all currently operational WCDMA/EDGE bands can be synthesized by a single VCO working at the double or quadruple of the desired band.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:46 ,  Issue: 7 )
RFIC Virtual Journal, IEEE

Date of Publication:

July 2011

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