Envelope-tracking modulator for mobile handsets enters production

June 11, 2013 // By Paul Buckley
Nujira has unveiled the company's newest Coolteq.L envelope-tracking power supply modulator chip for LTE handsets.

Nujira's NCT-L1300 claims to deliver the best envelope-tracking modulator performance on the market across all key metrics: system efficiency, noise, bandwidth, linearity and RF output power. The new chip is now being geared up for volume production to support 4G smartphone shipments in 2014.

The NCT-L1300 passes an efficiency milestone, the company says. By delivering power conversion efficiencies in excess of 80%, Nujira's new chip enables smartphone vendors to achieve 50% system efficiency (PA & ET) with LTE signals. The NCT-L1300 offers high bandwidth, high accuracy tracking over a wide voltage swing range of 0.5-4.5V.

Nujira’s precise tracking ISOGAIN technique linearises the PA, demonstrating adjacent channel performance better than -50 dBc without modem assistance or digital predistortion.

The NCT-L1300 supports PA output powers of up to 29 dBm, enabling full power LTE transmissions and eliminating the need for maximum power reduction (MPR) - even for advanced RF front end architectures featuring MIMO, carrier aggregation and antenna tuning.

The device delivers ultra low noise performance: -135 dBm/Hz.  The NCT-L1300 also supports for 20 MHz LTE channels, with minimal impact on efficiency.  The device provides fast mode switching and low standby power to support both TD-LTE and FD-LTE waveforms in ET mode.  The NCT-L1300 is equipped with industry-standard interfaces, compatible with a wide range of LTE chipsets and RF PAs from leading vendors.

Tim Haynes, CEO of Nujira said: “The NCT-L1300 has been designed to extend battery life, boost network coverage and data rates, and deliver a true 4G experience to users. The chip is a culmination of everything we have been working on for more than a decade. Breaking the 50% system efficiency barrier is a watershed and our new chip puts us in prime position to support OEMs in creating 4G products that meet users’ expectations. With samples available next month we are now gearing up for a very rapid production ramp in 2014, when we expect to see ET