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Design of a 4.6 GHz high-performance quadrature CMOS VCO using transformer couple

Author:
Xiushan, Wu   Zhigong, Wang   Zhiqun, Li   Qing, Li   


Journal:
Journal of Semiconductors


Issue Date:
2009


Abstract(summary):

A CMOS quadrature LC-tank voltage-controlled oscillator topology which uses a planar spiral transformer as coupling elements has been implemented in mixed-signal and Rf 1P6M 0.18 mum CMOS technology of SMIC. The measured phase noise is -125.7 dBc/Hz at an offset frequency of 1 MHz from the carrier of 4.6 GHz while the VCO core circuit draws only of 10 mW from a 1.8 V supply. The measured phase error is approximately 1.5deg based on the time domain outputs and the output power is about -2 dBm. The VCO can cover the frequency range of 4.36-4.68 GHz. The tuning range is 320 MHz (7.0%) and the FOM is -189 dB.


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