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Reconfigurable transceiver eliminates SAW filters

Posted: 28 Feb 2011 ?? ?Print Version ?Bookmark and Share

Keywords:reconfigurable transceiver? SAW filters? Scaldio?

Renesas Electronics Corp. and Imec jointly introduced a highly-linear reconfigurable transceiver that eliminates the need for SAW filters to participants of the International Solid-State Circuit Conference (ISSCC) held in San Francisco.

Described in detail in a paper presented at ISSCC, the approach is said to be a breakthrough toward fully reconfigurable radios by relaxing the requirements of the antenna filters, which suffer today from limited flexibility due to high filtering specs. The fully reconfigurable transceiver, dubbed Scaldio, is compatible with multiple wireless standards, including the fourth generation mobile broadband standard 3GPP-LTE.

The reconfigurable receiver and transmitter technology is targeted for mobile handsets and all kinds of battery-powered wireless connectivity devices, as well as for base-stations for small cells. It can also be programmed to meet the requirements for many standards and dedicated needs.

''With 3dB noise figure and capable of handling a 0dBm blocker at 20MHz offset, the receiver has the highest blocker resilience for low noise figures. The fully reconfigurable receiver also achieves the highest linearity (+10dBm IIP3, +70dBm IIP2) and frequency range reported up to now, and handles blockers well in any mode,'' according to Imec and Renesas.

"The transmitter combines adaptive out-of-band noise filtering with voltage-sampling upconversion to achieve RX band noise down to -162dBc/Hz allowing also here SAW-less operation,'' according to the paper. ''SAW-less transmitters become more and more important with the evolution toward future standards such as 3GPP-LTE where transmitters will need to operate in multiple FDD (frequency division duplex) bands.''

Yoshinobu Nakagome, associate general manager of the mixed signal core development division, technology development unit at Renesas, said: "This accomplishment is an important step toward our integrated RF solution for next generation multimode wireless communication systems.''

- Mark LaPedus
??EE Times

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