Nujira has been granted two key patents in the US.
"We have developed the world's most extensive and complete patent portfolio around envelope tracking, and currently has 65 patents filed or granted worldwide," said CEO Tim Haynes. "Several of our core patents, including those recently granted in the US, act as blocking IPR for anyone trying to develop commercially viable envelope tracking power amplifiers for cellular infrastructure, handsets and digital TV."
Envelope tracking is a technique that can cut power wastage on RF output stages - by supplying the output amplifier from power rails that track the RF signal envelope.
"Whilst this principle has been known and actively studied since the 1930's, Nujira has been the first to successfully address the challenge of tracking the transmitted signal accurately in commercial products for 3G, 4G and Digital TV applications," said the firm.
It's intellectual property covers, for example, agile DC-DC converters that can generate voltage rails modulated at multi-MHz frequencies.
It is aiming its products, dubbed Coolteq power modulators, at the next generation of 3G/4G cellular base stations, handsets, digital broadcast transmitters and military communications systems.