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A CMOS quadrature LC-tank voltage-controlled oscillator topology which uses a planar spiral trans- former as coupling elements has been implemented in mixed-signal and RF 1P6M 0.18 μm 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 1.5 ° 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.
A CMOS quadrature LC-tank voltage-controlled oscillator topology which uses a planar spiral trans- former as coupling elements has been implemented in mixed-signal and RF 1P6M 0.18 μm 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 10 mW from a 1.8 V supply. The measured phase error is approximately 1.5 ° based on the time domain outputs and the output power is about -2 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.