Analysis on resonator coupling and its application to CMOS quadrature VCO at 8 GHz

Donghyun Baek, Taeksang Song, Sangsoo Ko, Euisik Yoon, Songcheol Hong

Research output: Contribution to conferencePaper

21 Citations (Scopus)

Abstract

A low phase noise CMOS quadrature VCO is presented. A transformer resonator coupling is analyzed. It is founded that the coupled resonator has high frequency selectivity. The Q factor of a coupled resonator is (1+k) times higher than a single LC resonator. This enhancement leads to low phase noise and low power consumption of a VCO. The VCO is implemented using 0.18 μm CMOS technology. Two VCOs are linked to generate I-Q signals by the direct current modulation method. The VCO shows low phase noise performances of -110 and -117 dBc/Hz at the offset frequencies of 600 kHz and 1 MHz respectively. The oscillation frequency is 8 GHz. The tuning range of 250 MHz is achieved with the control voltage from 0 to 1 V. The VCO draws 8 mA in core circuits with 3 V supply.

Original languageEnglish
Pages85-88
Number of pages4
Publication statusPublished - 2003
Event2003 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium - Philadelphia, PA, United States
Duration: 2003 Jun 82003 Jun 10

Other

Other2003 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium
CountryUnited States
CityPhiladelphia, PA
Period03/6/803/6/10

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Baek, D., Song, T., Ko, S., Yoon, E., & Hong, S. (2003). Analysis on resonator coupling and its application to CMOS quadrature VCO at 8 GHz. 85-88. Paper presented at 2003 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Philadelphia, PA, United States.