industry femtocells
Our PA modules are designed for long operating life. They employ HBTs featuring InGaP,which have a very strong track record in creating PAs that combine high reliability with extremely high efficiency
changes. To prevent the AWB modules from becoming ineffective as the latest standards are deployed, we have designed them with the future in mind. Thanks to this approach, we have enabled the creation of femtocells that can adapt to standards and support migration and growth strategies.
One of the technologies that is on the horizon is frequency division duplex LTE, which is compatible with our AWB7227. Figure 3 shows the AWB7227 performance with an LTE waveform. Again, there is a healthy margin to the performance required by the standard. When building an infrastructure, particularly one based on femtocells, it is critical to deploy robust components that are capable of reliable operation for many years. This means that power amplifiers must have a long mean-time-to-failure (MTTF). The MTTF is primarily dictated by the semiconductor material itself and the junction temperature.
Our PA modules are designed for long operating life. They employ HBTs featuring the ternary material InGaP, which
Figure 4. The power-added efficiency of the AWB7227 is best in class, thanks in part to the inclusion InGaP
have a very strong track record in creating PAs that combine high reliability with extremely high efficiency (see Figure 4). This pairing of attributes has made this type of module a very popular choice for many years in applications demanding similar power levels to those used in femtocell networks.
Figure 5 shows the thermal scans of the AWB7227 when operated at its rated voltage and driven to its rated power with a CW signal. The measured die junction temperature is just 115 o
C, which translates to an extremely high MTTF.
The AWB series has been designed to do an excellent job of converting DC input power to usable RF transmit power. Considering that the PA remains one of the key consumers of power in any base station, efficiency is an extremely important parameter. Thanks to the high efficiency of the AWB7227, the overall power consumption of the femtocell will be more manageable, supporting ‘green’ initiatives and enabling other key femtocell features such as battery back-up.
Figure 5. A thermal scan of the AWB7227 power amplifier module reveals a junction temperature of just 115 o
C when the device was operated at its rated voltage and driven to its rated power with a CW signal 20
www.compoundsemiconductor.net October 2010
By carefully selecting materials and applying sound design principles, we are continuing to build a growing portfolio of high-performance PA modules that should lead to the construction of higher-performance femtocells. As the small cell market for both service providers and consumers grow, our AWB series of PA modules will provide a catalyst for ubiquitous coverage from 3G and 4G wireless networks while delivering a high quality of service.
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