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July 2006 [Devices & ICs] White Paper: RF Power Devices Meet Wireless Challenges Head On RF Power Devices Meet Wireless Challenges Head On? The number and types of commercial wireless-communications technologies have exploded in the last 15 years, from comparatively simple systems using FDMA to the higher-order modulation schemes employed in GSM and CDMA and new standards and services such as WiMAX and ZigBee?. For semiconductor manufacturers serving these applications, they represent immense opportunities. For... July 2006 [Devices & ICs] The Polar Plus Advantage The Polar Plus Advantage GSM/EDGE/WCDMA and CDMA2000 employ complex modulation schemes that require RF power amplifiers to be extremely efficient and linear. To achieve the necessary performance, polar modulation is often employed. In polar modulation, the modulation is broken down into amplitude and phase components that are processed separately. Further down the transmit lineup, the AM and PM signals are recombined to form a fully... |
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