A Phase Noise Optimized 4 GHz Differential Colpitts VCO

초록

This letter presents the design and analysis of phase noise optimization of a 4-GHz differential Colpitts voltage-controlled-oscillator (VCO) A low phase noise is achieved by a Colpitts oscillator and a VCO bias optimization using an amplitude control method The measured phase noise is - 134 8 dBc/Hz at 1 25 MHz offset frequency from 4 GHz operating frequency The VCO is implemented using 0 24 mu m SiGe BiCMOS process with integrated copper inductors The wide VCO frequency range covers both PCS and IMT bands and draws about 15 9 mA from a 2 7 V power supply

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