As the only company so
far entrusted with national project on TD-SCDMA and “863”
project by MoST (Ministry of Science and Technology), Comlent
develops and owns all IP of its TD-SCDMA chipset CL4020 and
CL4050, which are RF transceiver and ABB (Analog Base Band)
respectively. The chipset is the only solution so far who can
interface with all the domestic TD-SCDMA base band solution
suppliers, i.e. Spreadtrum, COMMIT, T3G, Datang and CYIT.
The chipset is specifically designed for China 3G, TD-SCDMA
in CMOS technology. Both chips, CL4020 and CL4520 are packaged
in a 48-pin, 7mm x 7mm QFN package. Transmit EVM of CL4020 is
below 4% while the TD-SCDMA specification requires EVM below
17%. The PLL’s integrated phase noise (1kHz-640kHz) is
less than 0.85 degree. Noise figure of the whole receive channel
is less than 4dB. In general, the chipset’s performance
meets 3GPP TD-SCDMA specification and is world class. Advantages
of CL4520 are low cost, high dynamic range, accurate DC offset
cancellation, and accurate digital gain control, etc.
Because of its advanced technology and excellent performance
in CMOS technology, the technical paper to introduce this
design was disclosed in Feb. 2007 on ISSCC, the worldwide
top conference on IC design, which indicates China’s
CMOS TD-SCDMA chipset has reached world class performance.
And it was also the 1st time that Chinese company shows the
design for a whole IC on ISSCC during its 54-year history.
Below are CL4020’s features and advantages.
Low cost
- Using CMOS technology with low cost;
- Small die size;
- High integration with built-in low pass filter and ?-? fractional
synthesizer, less external components and overall low cost;
- Potential of further integration with base band IC resulting
in SoC with ultra low cost.
Low power consumption
- Simple circuitry with zero-IF architecture and low power
consumption;
- Low voltage power supply with advanced deep sub-micron process;
- 90mA current
State-of-art circuit design
- Digital detection and loop-back cancellation technology
to ease design difficulty;
- Digital control on RF front-end to simplify analog circuit
design and optimize performance;
Specific for China 3G
- Dual band, 1880MHz-1920MHz and 2010MHz-2025MHz for TD-SCDMA;
- Interface compatible with all base band IC suppliers in
China;
- Support single carrier HSDPA with qualified transmit and
receive EVM, which will be demonstrated in 2007; |
