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Evelope tracking offers rapid characterization of power amps

Posted: 08 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:wideband? envelope tracking? power amplifier?

Nujira Ltd has unveiled the NCT-T9101 Coolteq, a wideband Envelope Tracking (ET) Flexible Development System (FDS) for characterizing energy-efficient power amplifiers for global cellular frequency bands.

The Nujira NCT-T9101 Coolteq Flexible Development System (FDS) enables operation and characterization of envelope tracking power amplifiers (PAs) at any RF frequency from 200C2700MHz, covering all major cellular bands worldwide, as well as most digital broadcast and military communications frequencies. The system can be readily configured to support the development of a wide range of transmitters, including 3G/4G smartphones, USB dongles, base stations, digital TV transmitters and military radios.

Designed as a lab instrument for the development and characterization of envelope tracking PAs, the FDS generates simultaneous RF and Envelope waveforms which can either be user-generated from arbitrary I/O waveforms, or selected from a predefined library of 3G and 4G standards. Envelope signals are output from a Flexible Envelope Port (FEP) interface module, supporting both analog (handset) and digital (infrastructure) envelope formats standardized by the OpenET Alliance. Comprehensive PC-based software supports real-time measurement and analysis of PA efficiency, linearity, and AM-AM/AM-PM distortion, and the system can optionally be configured to include Nujira's Digital Pre-Distortion (DPD) algorithms running in hardware or software.

Using the new FDS, Nujira has demonstrated that a single standard handset PA can deliver 50 percent efficiency across the 1500C2100MHz frequency band, covering 12 LTE bands with a single PA and halving the energy consumption of the transmitter when compared to traditional DC/DC converters. By enabling broadband, converged PA devices which replace the 5 or 6 single-band PA modules used in today's smartphones, Envelope Tracking can significantly reduce handset size, cost and power consumption.

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