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SiGe Power Amplifier for CDMA

By - Source: Tom's Hardware | B 0 comment
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All the bells and whistles of spread-spectrum CDMA devices - which include increased talk time, and "bandwidth on demand," and expanded content - sound great. The problem for us skeptics is that the purveyors of cell phone technology haven't really gotten the old systems working right before leaping toward something more. 20 minutes down the coast highway I get no service at all. I'd be happy to have my phone work all the time and forget about anything fancier (except maybe wireless email that lets me use my primary account instead of a fourth one). To put the new new system in place, all the hardware needs to arrive for the cell phones and networks and, whether you're happy about it or not, the parts are arriving fast and furious. Last week, Atmel announced a new cell-band power amplifier module for the U.S., Korean, South American, and Chinese CDMA phone markets. Based on the company's Silicon-Germanium (SiGe) semiconductor process, the amplifier was developed as part of the CDMA345 joint development project with TriQuint Semiconductor. A CDMA SiGe transmitter IC, the T0345, and a companion PCS-band CDMA power amplifier module will be announced later on. The T0370 offers 3 quiescent current states (25, 65, 111 mA) and 35% efficiency to let phone designers vary the IC's power setting as the phone moves around the CDMA network. The new module incorporates a CMOS-compatible logic interface as well as an internally matched input and output (50 ohm RF impedance). The CMOS-compatible logic interface allows the T0370 to be interfaced directly with low-voltage CMOS microprocessors without additional circuitry. Samples of the T0370 in 6 x 6 mm lead frame outline packages with 8 pins and evaluation boards are available now. And, if you're interested in what the CDMA proponents are working on, check out the CDMA Development Group website .

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