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Technology Stocks : 4G - Wireless Beyond Third Generation
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From: waitwatchwander10/3/2007 8:40:49 AM
   of 1002
 
PA proves crucial in WiMAX designs

anadigics.com

<snip>A major design alternative in WiMAX PAs is the bias structure, with options including Class A or Class AB design. The advantage to designing a Class A power amplifier is that it is easier to achieve a wide bandwidth and to maintain EVM performance over a wide dynamic range. However, this feature could be a disadvantage. For instance, if a mobile WiMAX handset moves closer to a base station, or if a fixedpoint CPE is located close to the base station, the output power of the transmitter can be reduced without degrading the data link. But despite the lower output power, a Class A amplifier will provide no actual saving in power consumption. In contrast, with a Class AB design, as the output power is reduced, the current consumption drops accordingly (until it reaches a lower limit, referred to as quiescent current).
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