 Noise Interference Problem |
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. |
Designing a LAMINATE inductor with the
characteristics of a chip component would not
produce an inductor mounted silicon tuner IC.
In designing an IC that must conform to the
world's highest tuner characteristics, fitting
the seven inductors needed for the input
and output onto a 9 mm square interposer
substrate was not just a problem in terms of
interference between the inductors. It also
meant integrating an IC, another source of
noise, with an antenna (an inductor), in other
words, a major noise issue somehow had
to be solved. Restrictions in the size of the
interposer substrate also came into play as it
limited the space that could be put between inductors and between them and the noise
sources. Coordinated design that made the
most of simulation reduced the impact of
noise while proprietary technology lowered
the interference when merging the inductors
and created a tuner with characteristics that
was on par with a silicon tuner equipped with
external components.
 Suppressing Interference between
Inductors
A magnetic field is formed as current passes
through the inductors. The magnetic fields
formed by the inductors created by wiring
in the interposer substrate affect adjacent
inductors and generate unwanted current.
A filter extracts the required channel signals
from the broadcast signals entering the
antenna and an amplifier boosts their strength.
The problem here is that the magnetic field
generated by the previous inductors affects
the inductors in the following stage generating
unwanted current that prevents appropriate
adjustment of signal strength.
The inter-inductor interference suppression
can be obtained by connecting the inductors
to ground separately but this will make the
interposer substrate excessively large.
To use a 9 mm × 9 mm interposer substrate,
Sony used electromagnetic field simulation
to design a layout that would effectively
reduce interference. The design effort that
successfully delivered the 9 mm × 9 mm chip
was not limited to the layout of the interposer
substrate but redesigned motherboard layout,
as well.
Spurious
One characteristics that is critical for analog
broadcast reception and is particularly
difficult to design for is spurious radiation.
The RF IC contains a local oscillator that
generates high-frequency components, which
could degrade the picture quality of specific
channels, if it contaminates tuner input or
output.
In our efforts to design out the effect of
spurious radiation from the inductors, Sony
first identified their source and used an
electromagnetic field analysis tool to check
inductor emission.
The analysis results obtained were reflected
in the design making it possible to produce
a TV tuner with more than adequate
specifications.
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| Future Developments |
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. |
As already stated, Sony succeeded in
replacing the coil tuner with a silicon tuner IC
in 2007. This project used interposer wiring
to form inductors, which are peripheral
silicon tuner IC components, and develop a
silicon tuner IC that mounted a LAMINATE
inductor, in other words, an on-board silicon
tuner.
Sony intends to further pursue this approach
of eliminating mounted components by
integrating them for miniaturization.
In particular, Sony will develop and apply
these technologies to create environmentally
friendly TVs that do not consume larger
amounts of resources.
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Figure 3 : High Resolution LAMINATE Technology
at SCID's Neagari Plant |
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See
all articles with figures and tables.  |
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Vol.66 |
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