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A Miniaturized Marchand Balun in CMOS With Improved Balance for Millimeter-Wave Applications

Xu, Leijun; Sjöland, Henrik LU ; Törmänen, Markus LU ; Tired, Tobias LU ; Pan, Tianhong and Bai, Xue (2014) In IEEE Microwave and Wireless Components Letters 24(1). p.53-55
Abstract
The analysis and design of a millimeter-wave passive balun on silicon substrate with small size and good balance is presented. The reason for the imbalance of the balun is analyzed and a novel method using two grounded T bars beneath the coupled lines to tune the balance is proposed. The balun was fabricated in a 65 nm CMOS process, by using broadside coupled lines with small separation, the length of balun is reduced, resulting in a size of only 0.01 mm$^{2}$. In the 57–67 GHz band, the measured amplitude imbalance is less than 0.5 dB and the phase imbalance is less than 1 $^{circ}$. This method for optimizing the imbalance of balun is efficient and it does not increase the size of balun.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Broadside coupled line, CMOS, Marchand balun, millimeter-wave, imbalance
in
IEEE Microwave and Wireless Components Letters
volume
24
issue
1
pages
53 - 55
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000329873700019
  • scopus:84892443850
ISSN
1531-1309
DOI
10.1109/LMWC.2013.2288270
language
English
LU publication?
yes
id
d537d7f7-5323-49db-b8d1-0731be4bb076 (old id 4194569)
date added to LUP
2013-12-12 10:11:44
date last changed
2017-03-12 03:58:33
@article{d537d7f7-5323-49db-b8d1-0731be4bb076,
  abstract     = {The analysis and design of a millimeter-wave passive balun on silicon substrate with small size and good balance is presented. The reason for the imbalance of the balun is analyzed and a novel method using two grounded T bars beneath the coupled lines to tune the balance is proposed. The balun was fabricated in a 65 nm CMOS process, by using broadside coupled lines with small separation, the length of balun is reduced, resulting in a size of only 0.01 mm$^{2}$. In the 57–67 GHz band, the measured amplitude imbalance is less than 0.5 dB and the phase imbalance is less than 1 $^{circ}$. This method for optimizing the imbalance of balun is efficient and it does not increase the size of balun.},
  author       = {Xu, Leijun and Sjöland, Henrik and Törmänen, Markus and Tired, Tobias and Pan, Tianhong and Bai, Xue},
  issn         = {1531-1309},
  keyword      = {Broadside coupled line,CMOS,Marchand balun,millimeter-wave,imbalance},
  language     = {eng},
  number       = {1},
  pages        = {53--55},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Microwave and Wireless Components Letters},
  title        = {A Miniaturized Marchand Balun in CMOS With Improved Balance for Millimeter-Wave Applications},
  url          = {http://dx.doi.org/10.1109/LMWC.2013.2288270},
  volume       = {24},
  year         = {2014},
}