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Design of a 2.5GHz Quadrature LC VCO with an I/Q Mismatch Compensator  

Byun, Sang-Jin (Dongguk University-Seoul)
Shim, Jae-Hoon (Kyungpook National University-Daegu)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.48, no.2, 2011 , pp. 35-43 More about this Journal
Abstract
In this paper, an analysis on I/Q mismatch characteristics of a quadrature LC VCO(Voltage controlled oscillator) is presented. Based on this analysis, a new I/Q mismatch compensator is proposed. The proposed I/Q mismatch compensator utilizes an amplitude mismatch detector rather than the conventional phase mismatch detector requiring much more wide frequency bandwidth. To verify the proposed circuit, a 2.5GHz quadrature LC VCO was designed in a $0.18{\mu}m$ CMOS process and tested. Test results show that an amplitude mismatch detector achieves similar I/Q mismatch compensation performance as that of the conventional phase mismatch detector. The I/Q mismatch compensator consumes 0.4mA from 1.8V supply voltage and occupies $0.04mm^2$.
Keywords
LC VCO; CMOS; I/Q mismatch;
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