A 25-GHz emitter degenerated LC VCO

A 25-GHz emitter degenerated bipolar LC voltage-controlled oscillator (VCO) designed in IBM's SiGe 6 HP BiCMOS process (f/sub T//spl sim/47 GHz) is presented. Including output buffers, the VCO occupies an area of 435 /spl mu/m/spl times/225 /spl mu/m and consumes 22 mW at a 1.9-V power supply. The phase noise at 1 MHz offset is -93 dBc/Hz and it achieves a high f/sub OSC//f/sub T/ ratio with a figure of merit of 174 dB.

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