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Intersil power amp extends range by 15 percent

Posted: 05 Aug 2002 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? isl3985? rf power amplifier? wlan power amplifier? 2.4ghz power amplifier?

The ISL3985 2.4GHz power amplifier from Intersil Corp. provides a typical output power of 21dBm and 28dB overall two-stage power gain that allows the device to increase its range by up to 15 percent and double the data throughput at maximum range.

It is designed to work with the company's PRISM WLAN chipset solutions and is suitable for current Wi-Fi and IEEE 802.11g products.

The 16-pad, 5-by-5mm QFN device operates from a 2.7V to 3.6V single supply and features a built-in 15dB detector with a 11dB accuracy. The two-stage radio frequency power amplifier (RFPA) is claimed by the company to exceed adjacent channel power ratio (ACPR) specifications with <-30dBc for the first side lobe and <-50 dBc for the second side lobe.

It also features a "sleep mode" (power up/down) function that eliminates external circuitry, thereby freeing board space and reducing component count and cost. When the CMOS-compatible Power Enable (PE) pin is driven low, the total supply current to the RFPA drops to <505A within 300ns. Full output power returns within a few hundred nanoseconds when the PE pin is driven high.

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