Wideband ring VCO for cognitive radio five-port receiver
Pages 18 - 22
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.
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B. Razavi. Design considerations for direct-conversion receivers. IEEE Transactions on Circuits and Systems, Part II, 44:428--435, June 1997.
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F. R. de Sousa, B. Huyart, and R. N. de Lima. A new method for automatic calibration of 5-port reflectometers. Journal of Microwaves and Optoelectronics, 3(5):135--144, July 2004.
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Index Terms
- Wideband ring VCO for cognitive radio five-port receiver
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Published In
September 2010
228 pages
ISBN:9781450301527
DOI:10.1145/1854153
- General Chair:
- João Antonio Martino,
- Program Chairs:
- Guido Araújo,
- Alex Orailoglu,
- Publications Chair:
- Felipe Klein
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Published: 06 September 2010
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