Three linearized power amplifiers (PAs) for Wi-Fi 802.11b/g and a/b/g applications feature low current (PA2418), high power (PA2420), and dual-band (PA7706) options. The PAs, developed by Epicom, address current WLAN applications as well as emerging embedded wireless applications in handheld devices such as WiFi-enabled VoIP phones. A patent-pending linearizing technique provides improved power efficiency and greater range for Wi-Fi products while maintaining data accuracy. These PAs can easily be adopted into current and new designs and are compatible with most popular 802.11b/g and a/b/g chip sets.
The PA2418 is a two-stage, 2.4-GHz device that's optimized for ultra low power consumption in handheld applications. It delivers up to +16 dBm output power with an error vector magnitude (EVM) below 3% at an 55-mA operating current when biased at 3.3 V. The PA2420 is a high-efficiency three-stage, 2.4-GHz PA suited for WLAN 802.11b/g access points and potential WiMax applications. It provides up to +21 dBm output power with an EVM less than 3% and operating current of 190 mA (3.3 V).
The PA7706 dual-band PA features two power amplifiers in one package, delivering up to +19 dBm of output power with an EVM below 3% and an operating current of 135 mA when biased at 3.3 V, and up to +18 dBm with an EVM below 3% and operating current of 200 mA (3.3 V) across the 4.9- to 5.8-GHz band. The PA7706 is supplied in a 4- by 4-mm QFN package, while the PA2420 and PA2418 are housed in miniature QFN 3- by 3-mm packages. More information is available at www.epic.com.tw.