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OpenET Alliance releases system simulation model for Envelope Tracking

June 12, 2012 // Nick Flaherty

OpenET Alliance releases system simulation model for Envelope Tracking

The OpenET Alliance has released a new High Dynamic Range system simulation model for Envelope Tracking applications in mobile handset components.


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The ET System Simulation model, jointly developed by OpenET members Nujira and the University of Firenze, aids system optimization by making it easier for designers to identify sources of noise and distortion and to make the necessary design tradeoffs.
The System Simulation model, which has been developed using Agilents Advanced Design System (ADS), provides a framework to model a complete handset ET system, and incorporates a High Dynamic Range (HDR) RF Power Amplifier model developed by Nujira. The model is suitable for use by chipset designers, PA vendors, filter manufacturers and handset OEMs.
System simulation capability is particularly important in Frequency Division Duplex (FDD) systems, such as the 4G LTE standard, where the transmit and receive paths are operating simultaneously. Multiple noise and distortion mechanisms in the transmit path can feed into the receive path, and can result in reduced receiver sensitivity.
Envelope Tracking introduces new digital and analogue paths, which can contribute to the system noise budget. With so many interactions and co-dependencies to consider, comprehensive system simulation is the only viable way for the designer to make the necessary system tradeoffs. However, PA models based on captured data have typically suffered a noise floor of around -90 dB, which masks many of the other system effects.
The OpenET Alliances High Dynamic Range (HDR) PA simulation model overcomes this problem. Instead of interpolating between measured data points, the HDR PA model uses an algorithmic representation of the PA behavior to generate a continuously variable output, eliminating measurement noise and quantization errors. This mathematical modeling approach enables a simulation environment with almost 150 dB of dynamic range.
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