This paper presents novel three-dimensional (3-D) symmetric passive components, including inductors, transformers, and balun. Layout areas of these components are drastically reduced by 32% to 70%, while the symmetry of the input and the output ports is still maintained. The inductance mismatch in the 3-D transformer is less than 0.1%, and the coupling coefficient can be up to 0.77. The 3-D balun manifests less than 0.6-dB gain mismatch for 10-GHz range, and the phase error is less than 7° from 1- to 10-GHz frequency range according to measurement results. Furthermore, the self-resonant frequency (fSR) of the proposed architecture is improved by 32% to 61% in contrast to their planar counterparts. On the other hand, the quality factor is degraded by less than 2 for the sake of using lower metal layers. The distributed capacitance model is utilized to validate their superiorities in fSR. All the devices are fabricated in a generic 0.18-μ CMOS process.
|頁（從 - 到）||1413-1423|
|期刊||IEEE Transactions on Circuits and Systems I: Regular Papers|
|出版狀態||Published - 1 7月 2007|