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Atmel RF solution eyes 5.8GHz cordless phones

Posted: 23 Sep 2004 ?? ?Print Version ?Bookmark and Share

Keywords:atmel? transceiver ic? atr2808? up-conversion mixer? atr7039?

Atmel Corp. announced the availability of a highly integrated high-performance RF solution for digital cordless phones operating at the license-free 5.8GHz frequency band.

Thanks to their high integration, low number of external components and easy handling, the new devices will help to reduce manufacturing costs of cordless phones by about 25 percent, depending on the design, the company said.

Supporting multi-handset applications, the new solution promises to enable cordless phone designers to reduce the number of external components down to 80 and the board size by nearly 50 percent. Atmel disclosed that its reference boards demonstrate excellent performance in terms of sensitivity (-97dBm) and power output (27dBm), resulting in improved phone coverage externally at distances of more than 300m.

On the basestation side, Atmel's 5.8GHz solution contains a 2.9GHz/2.4GHz transceiver IC ATR2808, which is a single-chip device with integrated synthesizer and VCO including resonator, and the up-conversion mixer ATR7039 as frequency doubler. The 2nd harmonic is selected by a dielectric bandpass filter directly supplying the input of the 5.8GHz power amplifier ATR7035 with an output power of 28dBm. Both the ATR7035 and the ATR7039 are manufactured in Atmel's advanced SiGe technology, which only requires a single 3V supply voltage. They feature a high output power of 11dBm and require few external components. On the basestation's receiving side, the solution includes a highly integrated 2.4GHz SiGe LNA T7024 with a typical gain of 18dB and a noise figure of 2.1dB (typical).

The dualband 5.8GHz RF for the handset receives at 5.8GHz and transmits at 2.4GHz. In the RF module's handset portion, the 5.8GHz signal is down-converted by a versatile mixer alongside a fixed local oscillator of approximately 3.3GHz generated by the VCO/PLL IC ATR2807. This VCO/PLL IC features an auxiliary voltage regulator on-chip (3.2V to 4.6V) and a fast settling synthesizer. The resulting IF frequency in the 2.4GHz range is demodulated by the transceiver IC T2802.

Samples are already available, with pricing for the entire set starting at $13 in 10,000-unit orders. Reference boards for the handset and the basestation are available for $2,000 to help speed up the design-in time.

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