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Variable gain amplifier modules deliver linearity and space savings

Mon, 10/03/2011 - 3:20am
ECN Europe

Avago Technologies has unveiled a high-linearity variable gain amplifier (VGA) module for base transceiver station (BTS) applications.

Picture: Avago

The new small-footprint ALM-81224 VGA module is suitable for replacing discrete solutions, providing space savings. Operating in a broad frequency band from 1450 to 2750 MHz, the module addresses cellular BTS automatic gain control (AGC) and temperature compensation circuitry applications.

The ALM-81224 VGA module’s linearity provides the ability to distinguish between wanted and spurious signals that are closely spaced. Available in a 6.0 by 6.0 by 1.0mm package, the module offers current consumption of 383mA. Its input is fully-matched to 50 Ohms and output match can be tuned for optimal performance at a particular frequency band within the operation range.

The ALM-81224 module leverages the company’s proprietary 0.25 µm GaAs Enhancement-mode pHEMT process to achieve its RF performance. It delivers high dynamic range of 38dB under 0 to 3.3V control voltage. Using a single DC voltage input pin to achieve gain control, the module provides a high maximum gain of 23.8 dB typical.

Samples and production quantities are available now.

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