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High-efficiency power amplifiers for WLAN applications
13 July 2005, Analogue, Mixed Signal, LSI
SST Communications, a developer of RF integrated circuits for a range of wireless and multimedia applications, and a subsidiary of flash memory specialist, SST (Silicon Storage Technology), has introduced two new high-efficiency power amplifiers for 802.11a and 802.11b/g WLAN systems.
Both devices offer very low power consumption, as well as on-chip power detection to provide maximum efficiency and significant cost savings to designers of power-sensitive WLAN equipment, such as PCMCIA, MiniPCI and USB cards, and handheld computing and communications devices. The PAs also help customers save on costs and PCB space by featuring on-chip power detectors and minimising the number of external devices.
The devices include the SST12LP14A for 2,4 GHz 802.11b/g and the SST11LP11 for 5 GHz 802.11a. When configured for high-efficiency operation, the versatile SST12LP14A only requires a low-quiescent current (Icq) of 45 mA. It provides 29 dB gain and linear output power of 17 dBm at Icc of 85 mA. Under high-power configuration, the same device provides Pout< of 22 dBm at 210 mA for 802.11g and Pout of 23 dBm at 240 mA for 802.11b application, respectively. Designed to operate over the entire 802.11a band between 4,9-5,8 GHz, the SST11LP11 requires Icq of 80 mA. It consumes 180 mA when delivering 24 dB gain and 18 dBm output power across the 4,9-5,8 GHz band.
In addition to the on-chip power detectors, the SST12LP14a and the SST11LP11 feature high-speed (less than 200 ns) power up/down control through a single combined reference voltage pin. |
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