Wideband ring VCO for cognitive radio five-port receiver

Authors:
Francisco de Assis Brito Filho;Fernando Rangel de Sousa
Affiliations:
LSI-TEC, São Paulo, Brazil;Federal University of Santa Catarina, Florianópolis, Brazil
Venue:
SBCCI '10 Proceedings of the 23rd symposium on Integrated circuits and system design
Year:
2010

Citing 4
Cited 0

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IEEE Journal on Selected Areas in Communications

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Abstract

This paper presents an wideband ring VCO for cognitive radio five-port based receivers. Also presents testbenches to demonstrate the improvement of five-port architecture in homodyne receivers. A three-stage differential topology using transmission gates was adopted to implement the VCO in order to maintain wide and linear tuning range and a low phase-noise. Monte-carlo analysis were performed for evaluating the phase-shift response, which should be 120$^o$ between stages. Those analysis will be used to develop a behavioral model of the VCO with focus on five-port receiver simulations allowing time-saving. It was observed a fairly linear correlation between control voltage and oscillation frequency in the range between 200 MHz and 1800 MHz. The VCO was designed for IBM 130nm CMOS technology.