Integrated surface-mount DVGAs can reduce basestation BOMs

April 30, 2012 // By Jean-Pierre Joosting
TriQuint Semiconductor has released two compact, digitally-controlled variable gain amplifiers (DVGAs) that integrate key functionality and can reduce BOM (bill of material) part counts.

These high-performance solutions provide receiver or transmitter gain control in base station transceivers, repeaters, point-to-point microwave radios, and satellite communications terminals. They are also an excellent choice for any application that requires automatic gain control to increase system dynamic range.

The TQM829007 operates from 600 to 1000 MHz while the TQM879008 operates from 1.5 to 2.7 GHz. Both are highly-integrated modules that simplify circuit design by combining all required components within leadless 6- x 6-mm, industry-standard SMT packages. The modules include gain blocks, a highly-linear amplifier, matching components, bias chokes and blocking capacitors, as well as a digitally-controlled, 6-bit attenuator that varies amplifier gain in 0.5 dB steps (across a 31.5 dB range) via a serial programming interface (SPI). The DVGAs operate over a temperature range of -40° to +85°C and have a minimum MTTF of 1,000 years at a mounting temperature of +85°C.

Today’s transceivers require the highest possible levels of functional integration with high performance to cost-effectively simplify RF design and manufacturing. The TQM829007 and TQM879008 are designed to achieve this goal, eliminating the need for commonly-used external components found in discrete designs to provide a complete gain-control solution optimized for best performance. They are also pin-compatible with the company's TQM879006 DVGA that covers 1.4 to 2.7 GHz and provides 31 dB of gain control, +25.4 dBm RF output and a 1.5 dB noise figure.

The TQM829007 600 to 1000 MHz DVGA delivers 1.5 dB gain control range in 0.5-dB steps; 31.5 dB gain; +24.3 dBm P1dB (+39.5 dBm OIP3) RF output; 2.1 dB noise figure. It draws 174 mA from a 5 V supply.

The TQM879008 1.5 to 2.7 GHz DVGA features 31.5 dB control range in 0.5-dB steps; 41.5 dB gain; +27.3 dBm P1dB (+48.5 dBm OIP3) RF output; 3.9 dB noise figure. It draws 285 mA from 5 V supply.

www.triquint.com