Power amplifiers offer high linearity, low current consumption

San Jose, Calif. — Avago Technologies has introduced one- and two-watt families of high-performance power amplifiers designed for next-generation cellular and WiMAX infrastructure applications. These amplifiers offer industry-low current consumption with no RF matching requirements.

The ALM-31122/-31222/-31322 family of one-watt base station power amplifiers is available in an ultra-compact size and with no RF matching requirements. This series is said to outperform its competitors by offering very high linearity and exceptional power added efficiency (PAE) at 400 mA typical current consumption levels. The new power amplifiers support cellular (GSM, CDMA, WCDMA, CDMA2000 and TD-SCDMA) and WiMAX frequencies.

Designed to support applications from 750 MHz to 3.9 GHz, the ALM-31×22 power amplifiers offer built-in active bias circuitry and no RF matching components, which simplify product design and shorten time to market, Avago said. Housed in a miniature 5.0 x 6.0 x 1.1-mm, 22-pin molded chip-on-board package, the ALM-31×22 is suitable for compact pico- or femto-cell base station applications.

At typical biasing conditions of 5 V and 400 mA, the ALM-31122 delivers 31.6 dBm of output power (P1dB), 47.6 Bm of third order intercept point (OIP3) and 15.6 dB gain at 900 MHz. The ALM-31222 delivers 31.5 dBm P1dB, 47.9 dBm OIP3 and 14.9 dB gain at 2 GHz; and the ALM-31322 delivers 31 dBm P1dB, 47.7 dBm OIP3 and 13.2 dB gain at 3.5 GHz.

Avago also introduced high-linearity two-watt power amplifiers, beginning with the ALM-32220. Similar to the one-watt power amplifiers, the two-watt devices also provide built-in active bias and require no RF matching components. Built to optimally support 1.7-GHz to 2.7-GHz applications, the 800 mA current consumption for the ALM-32220 gives it a best-in-class ranking among similar two-watt devices on the market, Avago said.

The ALM-32220 power amplifier delivers 34.4 dBm of output power (P1dB), 50 dBm of OIP3 and 14.8 dB gain at 2 GHz. The power amp is housed in a miniature 7.0 x 10.0 x 1.1-mm, 20-pin molded-chip-on-board package. Two additional two-watt amplifiers will be introduced in June; they are the ALM-32120, which supports 750 MHz to 1 GHz, and the ALM-32320, which is optimized for 3.3-GHz to 3.9-GHz frequencies.

Pricing: In 1,000-9,999 quantities, pricing for the one-watt ALM-31×22 begins at $3.75, and the two-watt ALM-32220 begins at $7.19.

Product information: ALM-31122, ALM-31222, ALM-31322, and RF/microwave solutions

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