A Wideband Transformer Balun With Center Open Stub in CMOS Process

This letter presents a wideband transformer balun with a center open stub. Since the interconnected line between two coupled-lines greatly deteriorates the performance of balun in millimeter-wave designs, the proposed center open stub provides a good solution to further optimize the balance of balun...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2014-09, Vol.24 (9), p.614-616
Main Authors: Cao, Jia, Li, Zhiqun, Li, Qin, Wang, Zhigong
Format: Article
Language:English
Subjects:
Baluns
CMOS
CMOS integrated circuits
CMOS technology
Coils
Couplers
Deterioration
Frequency bands
Impedance matching
Metals
Microwaves
Noise levels
open stub
transformer balun
Transformers
Wideband
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Summary:This letter presents a wideband transformer balun with a center open stub. Since the interconnected line between two coupled-lines greatly deteriorates the performance of balun in millimeter-wave designs, the proposed center open stub provides a good solution to further optimize the balance of balun. The proposed transformer balun with center open stub has been fabricated in 90 nm CMOS technology, with a compact chip area of 0.012 mm 2 . The balun achieves an amplitude imbalance of less than 1 dB for a frequency band ranging from 1 to 48 GHz along with a phase imbalance of less than 5 degrees for the frequency band ranging from 2 to 47 GHz.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2014.2328897