WLAN PAs feature low power draw at max linear output power - Embedded.com

WLAN PAs feature low power draw at max linear output power


Designed specifically for 802.11a/b/g WLAN systems, this pair of high-efficiency power amplifiers (PAs) offer low power consumption, as well as on-chip power detection to provide maximum efficiency. Potential applications include PCMCIA, MiniPCI, and USB cards, and handheld computing and communications devices. Developed by SST Communications, a subsidiary of SST, lets designers reduce pcb space by including on-chip power detectors to minimize the number of external devices, thereby reducing the overall cost.

The power amplifiers are the SST12LP14A for 2.4-GHz 802.11b/g applications and the SST11LP11 for 5-GHz 802.11a products. When configured for high-efficiency operation, the SST12LP14A requires a quiescent current of just 45 mA. It provides 29 dB gain and a linear output power of 17 dBm with an 85-mA Icc. Under high-power configuration, the same device provides an output of 22 dBm at 210 mA for 802.11g and 23 dBm at 240 mA for 802.11b applications, respectively. The SST12LP14A has a linearity of about 4% EVM (error vector magnitude) at 22 dBm output power. Designed to operate over the entire 802.11a band between 4.9 and 5.8 GHz, the SST11LP11 requires an Icq of 80 mA. It consumes 180 mA when delivering 24 dB gain and 18 dBm output power across the entire frequency band with 4% added EVM.

Both parts are available now in production quantities. The SST12LP14A starts at $0.45, while the SST11LP11 starts at $0.70, both in 10,000-unit quantities. For more information, go to www.sst.com.

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