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- Title
Miniature 60 GHz CMOS dual balun with excellent amplitude and phase properties.
- Authors
Lin, Yo‐Sheng; Lin, Yun‐Wen
- Abstract
A miniature CMOS dual balun which can be applied to a star mixer or a power amplifier for four‐way equal power dividing is reported. Compared with the four output coupled lines, the input coupled line has two‐fold metal width to achieve ideal coupling coefficient of 0.408. This is the way to achieve nearly perfect input‐port impedance matching and output‐port transmission properties. The dual balun occupies a small chip area of 0.0252 mm2 and achieves S11 smaller than −12 dB for frequencies of 50–110 GHz. For frequencies of 55–65 GHz, the dual balun achieves excellent S21 of −7.6∼−7.9 dB, S31 of −7.9∼−9 dB, S41 of −7.5∼−7.9 dB, S51 of −7.8∼−8.9 dB, magnitude of amplitude imbalance (MAI) of 0.34–1.1 dB and phase difference (PD) of 179.22°–180.78° for ports 2–3 and MAI of 0.3–1 dB and PD of 178.83°–180.48° for ports 4–5. The state‐of‐the‐art results of the dual balun indicate that it is suitable for millimetre‐wave systems.
- Publication
Electronics Letters (Wiley-Blackwell), 2016, Vol 52, Issue 3, p295
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/el.2015.3520