Ultra Compact Miniaturized Common-mode Filter for GHz Signals in LTCC Technology
Date Issued
2010
Date
2010
Author(s)
IEONG IAT IN, AO
Abstract
Compact SMD-typed common-mode filters applying single mushroom structure is proposed and miniaturized in this thesis. This type of filters is realized in LTCC technology and can be mounted on PCB using surface-mount technology (SMT). By routing the signal traces symmetrically, different effects are produced to common mode and differential mode. For common mode signal, the return current go through the mushroom structure, while the odd mode return current is zero at the via. By designing the physical parameters, the desired performance can be achieved.
The SMD-typed filters are unlike the conventional common-mode choke. The filter has wide-band common-mode suppression and good differential signal integrity at GHz frequency range.
In this thesis, it is focused on the design, analysis and investigation of the effect on differential physical configuration of the structure. The common mode suppression of the filters with fractional bandwidth larger than 100% is achieved in frequency domain. In time domain, the filters produce over 60% reductions in common-mode noise voltage. More importantly, very little influence is seen for differential signal; hence, the high-quality signal integrity is maintained.
Subjects
Common-mode suppression filter
Surface-mount device
Surface-mount technology
Low temperature co-fired ceramic
differential mode
common mode
Type
thesis
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ntu-99-R97942017-1.pdf
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