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Sirenza amplifiers target apps that need high gain and IP3

Posted: 13 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:sirenza microdevices? sba series? sbb series? sbb? sba?

Sirenza Microdevices has developed a family of 5V InGaP supply solutions in the SOT89 and SOT86 packages that can provide similar performance to its SBA 8V designs, but with improved operating robustness and RF efficiency.

Operating from a 5V supply with no Rbias dropping resistor, members of the SBB series of amplifiers are designed to address RF and IF amplifier applications where high gain and IP3 are required. The SBB-1089 and SBB-2089 are targeted at IF and CATV amplifier applications in the 50MHz to 500MHz range where high IP3 of -42dBm and low noise figure of 2.8dB to 3.3dB are needed. Meanwhile, the SBB-4089 and SBB-5089 are general purpose wideband RF gain blocks that can serve applications between 50MHz to 8GHz.

According to the company, the bias current is regulated to within 2 percent over a -40C to 85C ambient temperature and maintains good supply insensitivity similar to the conventional resistive self-bias Darlington gain blocks that operate from the higher 8V supply. At 2GHz, the gain varies by less than 1dB across the -40C to 85C temperature range. An output power greater than 20dBm and an IP3 of 35dBm are obtained at 1,950MHz at a nominal ambient temperature of 25C.

Generally, the 5V SBB-5089 obtains similar or better performance than the 8V supply designs while consuming 37 percent less total DC power. In particular, the 5V SBB-5089 outperforms the 8V SBW and SBA series designs in IP3 by over 2.5dB at 850MHz and 0.8dB at 1,950MHz. The 5V design also achieves 0.4dB to 1dB improvement in the 1dB output compression while operating from a much lower 5V supply. These InGaP SBB gain block products also operate with 35 percent less DC power consumption than existing 8V Darlington designs while providing more robust performance.

The Darlington feedback amplifier is one of the most commonly used topologies in RF amplifier design and has been used by several commercial companies to provide broadband amplifier solutions, explained the press release. Sirenza is applying this Darlington self-bias technique to microwave frequency gain blocks up to 20GHz as well as lower 3V to 3.3V supply operated gain blocks to satisfy a variety of standard 5V and 3V to 3.3V system applications.

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