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Counterpoint: CMOS is best choice for 3G handset PAs

Posted: 24 Feb 2010 ?? ?Print Version ?Bookmark and Share

Keywords:CMOS? GaAs? power amplifier? 3G handset?

3G power amplifiers (PA) have a challenging requirement of keeping linearity while delivering over a watt of peak power at frequencies up to 2GHz. Today's suppliers of 3G PAs utilize various forms of the process technology gallium arsenide (GaAs) to meet the stringent frequency and voltage swing requirements of the cellular PA. With today's push towards 3G smart phones with multiple radios and global roaming capability, the need for PA innovation has never been greater.

History has shown that once CMOS can meet the difficult analog performance requirements presented by an application, it always wins. A rapid migration to CMOS happens because the flexibility of CMOS leads to improvements in performance, creates the opportunity for new levels of integration and moves the manufacturing supply from small, captive wafer fabrication lines to mainstream wafer foundries where the highest quality and largest capacity can be realized. Past examples of this transition include modem AFEs, data converters, disk drive read channels, wireless transceivers, SLICs and optical networking ICs.

The fundamental advantage of CMOS is flexibility. With the availability of high performance complementary devices, CMOS designers have a richer design toolbox. For PA applications, this enables new topologies that overcome the assumed limitations of CMOS. Also with CMOS, many functions can be easily integrated into a single PA die, such as precision voltage and current references and process tracking circuits. With CMOS, digital circuitry is essentially free, so appropriate application can provide new solutions to old problems. With these advantages, CMOS can provide a better overall answer to the 3G PA challenge.

Previous CMOS PA attempts have failed to meet the performance level of the GaAs incumbents, falling short in areas like power-added efficiency, noise and reliability, plus they utilized expensive IC packaging and had high bill of material costs. Javelin Semiconductor's engineers have broken new ground by developing a pure CMOS implementation that outperforms GaAs PAs, while delivering new levels of reliability and robustness in a low cost commodity package.

Due to the known flexibility, reliability and manufacturing advantages of CMOS, it is the optimal process technology to meet the challenges presented by the PA function in 3G/4G cellular handsets.

- Brad Fluke
CEO, Javelin Semiconductor Inc.

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