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Single-Chip Triple-Band Transceiver IC for W-CDMA/UMTS Cellular Phones
CXA3361AGG
W-CDMA service, which is already available in Japan, is rapidly becoming
available in other markets worldwide. Due to this development there are
now increasing demands for transceivers that can support the frequency
bands used in the different countries adopting this system.
Although Sony has, up to now, developed single-band, dual-band, and triple-band
ICs for the Japanese domestic market, Sony has now deployed this
technology in developing a new triple-band IC that supports all the frequency
bands used worldwide.
This new IC, the CXA3361AGG, can support all the W-CDMA/UMTS carrier
frequencies used around the world. |
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CXA3361AGG |
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* Direct conversion architecture
* Built-in matching circuits
* Integrated high-speed/low-noise
synthesizer
* Supports the frequency bands
used in all countries |
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The CXA3361AGG is a single-chip
transceiver IC for the W-CDMA/UMTS
cellular phone system. It also supports
HSDPA* (category 6).
*HSDPA (high-speed downlink packet access):
A mobile communication method that speeds up
the W-CDMA downlink. |
Direct Conversion Architecture |
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The CXA3361AGG achieves a significant
reduction in external components compared
to the conventional superheterodyne
technique by adopting a direct conversion
architecture. |
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Built-in Matching Circuits |
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The CXA3361AGG achieves a significant
reduction in external components by
integrating the matching circuits (TXPA
driver output and RX mixer input)
required for the high-frequency signal
lines on the same chip.
Furthermore, by adopting a miniature
package (a 6 mm square, 1 mm thick, 97-pin VFBGA package), the CXA3361AGG
can reduce the circuit board area required
for this functionality including the external
components by one third to one half. |
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Integrated High-Speed/Low-Noise Synthesizer |
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The CXA3361AGG also integrates the
VCO and PLL circuits required for local
signal generation. |
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Supports the Frequency
Bands used in All Countries |
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The CXA3361AGG supports bands I, II,
III, IV, V, VI, VIII, and IX. By selecting
three of these bands, the CXA3361AGG
can be used in any country in Europe,
North America, Asia, or Japan. This device
also supports HSDPA (category 6).
Since the basic structure has been unified
with the ICs that predate the
CXA3361AGG (the single-band and dual-band
ICs), the customer can select an IC
that most closely matches the needs of
each of the customer’s products.
Furthermore, since the CXA3361AGG
adopts a standard 3-wire bus control interface,
it can be connected to a wide range
of digital baseband ICs. |
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•••• Ms. AKAHIDE ••••
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When we started development of
this W-CDMA transceiver IC, we
adopted a TX/RX two-chip structure
that would support a single
band (band 1). It was only later
that, to respond to changing
market needs, we considered
adopting a single-chip structure
and multi-band support. This was
because W-CDMA was also
adopted in the US and Europe and
HSDPA services were inaugurated.
That the specifications kept
changing made this a difficult
project. But the result is that the
CXA3361AGG is an IC that supports
all the standards that are in
place worldwide. |
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See
all articles with figures and tables.  |
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Vol.44 |
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