A 25-GHz emitter degenerated LC VCO

Abstract

A 25-GHz emitter degenerated bipolar LC voltagecontrolled oscillator (VCO) designed in IBM's SiGe 6 HP BiCMOS process ( T 47 GHz) is presented. Including output buffers, the VCO occupies an area of 435 m 225 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 OSC T ratio with a figure of merit of 174 dB.Index Terms-Voltage-controlled oscillator (VCO), emitter degeneration, oscillation frequency, tuning range, phase noise.