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A 21.5/43-GHz dual-frequency balanced Colpitts VCO in SiGe technology

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3 Author(s)
Mingquan Bao ; Microwave & High Speed Electron. Res. Center, Molndal, Sweden ; Yinggang Li ; Jacobsson, H.

A balanced Colpitts voltage-controlled oscillator (VCO) is designed and fabricated in a commercially available 0.25-μm SiGe BiCMOS process. It has the characteristics of the push-push VCO, i.e., the VCO has simultaneously a differential output at a fundamental frequency of 21.5 GHz and a single-ended output at the second harmonic frequency of 43 GHz. A differential tuning technique is applied to reduce the phase noise. The measured phase noise at 1-MHz offset is -113 dBc/Hz at 21.5 GHz and -107 dBc/Hz at 43 GHz. The corresponding output power is about -6 and -17 dBm, respectively, with a 5% tuning range and a 130-mW dc power consumption.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:39 ,  Issue: 8 )