
March 03, 2008
Reducing front-end complexity in multimode handsets
Sequoia Communications' new SEQ7400 RF transceiver design uses
direct-conversion techniques combined with an innovative W-CDMA LNA and
notch filter scheme to meet the requirements of W-CDMA, GSM and Edge
modulation schemes.
At Mobile World Congress in Barcelona, Spain,
Sequoia Communications displayed HEDGE transceiver’s capability to
support HSUPA, TD-SCDMA, S-Band and GMR satellite specifications via
extensive testing. Thus, making its HEDGE transceiver SEQ7400 the first
true flexible radio, claims Sequoia. Originally introduced last May,
the SEQ7400 is based on the company’s patented FullSpectra
architecture, which includes the only transmitter in the industry to
use polar modulation in all modes, according to the manufacturer. .
While NXP's Embedded Vector Processor (EVP) is a software-programmable
platform for basebands, NXP's plan for multiple radios needed in future
handsets remains a question.
Sequoia Communications,
for example, already offers a multimode transceiver that has been
verified to support HSUPA, TD-SCDMA, S-Band and GMR satellite
specifications.
Sequoia Communications has announced at Mobile World Congress that its SEQ7400 HEDGE transceiver has been verified to support HSUPA, TD-SCDMA, S-Band, and GMR satellite specifications via extensive testing, making it the first true "flexible radio." Originally introduced in May 2007, the SEQ7400 is based on the company's patented FullSpectra architecture, which includes the only transmitter in the industry to use polar modulation in all modes. This all-polar architecture enables this flexibility without the sub-optimal cost and power consumption that plagues traditional software-defined radio (SDR) approaches.