Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Reexamination Certificate
2006-01-12
2008-11-11
Lee, Benny (Department: 2817)
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
C336S200000, C455S313000, C455S323000, C455S326000
Reexamination Certificate
active
07449974
ABSTRACT:
Provided are an on-chip balun, a transceiver using the on-chip balun, and a method for fabricating the on-chip balun. The on-chip balun includes: a first metal winding including a port grounded and a port to which an unbalanced signal is input; a second winding outputting an induced current generated by the first metal winding as two signals having about equal intensity and a phase difference of about 180°; and a ground shield positioned between the first and second metal windings and having a symmetric structure so as to generate a symmetric parasitic capacitance between the ground shield and the second metal winding. The ground shield can be inserted between the first and second metal windings to remove an asymmetrical parasitic capacitance so as to reduce a phase imbalance and a gain imbalance of an output value of the second metal winding. As a result, a highly balanced on-chip balun can be fabricated.
REFERENCES:
patent: 6711395 (2004-03-01), Tonegawa et al.
patent: 6882263 (2005-04-01), Yang et al.
patent: 2003/0146816 (2003-08-01), Furumiya et al.
patent: 2005/0128038 (2005-06-01), Hyvonen
Lee Dong-hyun
Lee Jae-sup
Lee Seong-soo
Hamill Eric R
Lee Benny
Samsung Electronics Co,. Ltd.
Sughrue & Mion, PLLC
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