| Autor: |
Chinchun Meng, Sheng-Che Tseng, Tsung-Mao Chao, Kuan-Chang Tsung |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
IEEE Access, Vol 12, Pp 160614-160624 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2169-3536 |
| DOI: |
10.1109/ACCESS.2024.3486232 |
| Popis: |
In this paper, a planar Marchand balun and its modification version are analyzed and designed on the standard lossy silicon substrate of $10~\Omega $ -cm resistivity. The analysis shows that both Marchand balun’s outputs are always equal in magnitude and opposite in phase within all frequency ranges even on a lossy silicon substrate. The high-coupling-factor modified Marchand balun has a much wider operation bandwidth than the prototype. Additionally, the multi-layer-metal stacking capability in silicon IC technology favors implementing the coupled line with a high coupling factor. Two Marchand baluns are formed by two back-to-back $\lambda $ /4 coupled lines. The modified one has the duality topology to the original Marchand balun in structure but with a higher coupling factor when both Marchand baluns are designed with the same characteristic impedance, the geometric mean impedance of the even-/odd-mode characteristic impedances, of the constituent coupled lines. These two types of Marchand baluns are implemented on a standard silicon substrate, and obviously the modified Marchand balun has a better performance with outputs of $180\pm 6^{\circ }$ phase difference and ±0.5 dB magnitude imbalance from 4 GHz to 27 GHz. The maximum transmission coefficient is approximately −6 dB, and the 3-dB fractional bandwidth is 148%. Finally, two wideband Marchand balun applications in a Gilbert micromixer are demonstrated using 0.35- $\mu $ m SiGe BiCMOS technology. The modified Marchand balun integrated at the LO stage of the mixer offers more than 30% operation bandwidth than the conventional Marchand balun does. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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