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Low-Power Mobile TV Tuner IC
Allows Analog TV Reception on Cellular Phones
CXA3681ER
Although Sony has provided a wide range of TV tuner ICs for TV, VCR, set-top
box and other products, Sony is now adding to their lineup for the first
time a TV broadcast silicon tuner IC for mobile devices, the CXA3681ER.
The CXA3681ER obviates the need for the external components (coils (inductors)
and varactor diodes (capacitors)) previously required for the oscillator
and tunable filter circuits in conventional TV tuner modules.
This
not only allows the creation of ultraminiature TV tuner modules, but also
obviates the adjustment steps that were labor and time consuming in the
manufacture of such TV tuner modules.
In addition, this device achieves low distortion and low power consumption
with single 3.3 V power supply operation. |
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CXA3681ER |
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* No external coils or varactors required
for oscillator and tunable
filter circuits
* Automatic band selector circuit
covers the wide oscillator bandwidth
* Wide dynamic range RF gain
control amplifier
* Low power: 300 mW |
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No External Coils or Varactors
Required for Oscillator and
Tunable Filter Circuits |
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Until now, TV tuner ICs have adopted
single conversion. This technique requires
that oscillator and tunable filter tank circuits
(including large air-core coils and
varactor diodes that require a 30 V power
supply) be mounted in the TV tuner module. The CXA3681ER, however, adopts
double conversion, which does not require
these external components. This allows
extreme miniaturization of the TV tuner
module and operation on a single 3.3 V
power supply.
This also completely obviates the need for
the labor and time intensive adjustment
stage in the TV tuner module manufacturing
line and can contribute to a significant
reduction in production costs. |
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Automatic Band Selector Circuit
Covers the Wide Oscillator
Bandwidth |
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The CXA3681ER integrates both the
upconverter and the downconverter oscillator
circuits on the same chip and adopts
an automatic band selection system in
each.
By developing these automatic band selection
circuits, Sony was able to implement
oscillator circuits that support reception
of wideband TV signals. |
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Wide Dynamic Range RF Gain
Control Amplifier |
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By applying Sony’s superlative BiCMOS
process and RF circuit technologies, Sony
was able to develop a low-power/high-performance
RF gain control amplifier that
can process, with low distortion, TV signals
that require a wide dynamic range.
This allows stable TV reception even in
locations with extremely strong signal
fields, such as the vicinity of a TV broadcasting
tower. |
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Low Power: 300 mW |
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Sony’s unique circuit technologies make
it possible for the CXA3681ER to achieve
the lowest power consumption of any analog
TV silicon tuner IC. This can contribute
to reduced battery drain in mobile
equipment that provides this functionality. |
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•••• Mr. YAMAGUCHI ••••
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Although I enjoy watching soccer
matches on TV, I’ve often wondered
if it would be possible to
watch the Japanese national
team's matches while commuting
by train. Now, having been part of
the development team for the
CXA3681ER, with the release of
this device as a product, I have the
pleasure of having realized this
dream.
Although the many hurdles we
faced, from improving the characteristics
through mass production,
were high, and we ran into many
difficulties along the way, we succeeded
in developing a superb
product by combining the technological
abilities of all the team
members with our willingness to
accept challenges without tiring. I
strongly recommend that you look
into this product. |
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See
all articles with figures and tables.  |
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Vol.42 |
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