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Infineon touts high-performance LNA for GNSS

Posted: 28 May 2013 ?? ?Print Version ?Bookmark and Share

Keywords:low noise amplifier? GNSS? GPS?

Infineon Technologies has announced what it flaunts as a highly cost-effective low noise amplifier (LNA) for Global Navigation Satellite Systems (GNSS). The BGA825L6S features an ultra-low noise figure, high linearity, high gain and low current consumption over a wide range of supply voltages from 3.6-1.5V. According to the company, the device improves sensitivity, provides greater immunity against out-of-band jammer signals and reduces filtering requirements for GNSS LNA, which lowers the overall cost of the GNSS receiver.

The BGA825L6S is based on Infineon's B7HF SiGe technology that the firm said enables a cost-effective and ultra-small solution in a TSLP-6-3 package. The noise figure of 0.6dB is the lowest one available in the market today, stated Infineon. Noise figure is one of the key parameters for GNSS systems as it directly influences the sensitivity of the system, as well as the time-to-first-fix (TTFF) and time-to-subsequent-fix (TTSF). Thus, LNAs with a lower noise figure enable mobile phones with faster GNSS signal fix and much higher end user satisfaction.

The device offers an optimised out-of-band input intercept point 3rd order (IIP3 oob) of 8dBm. This is important because in today's smartphones a GNSS receiver co-exists with transceivers in the GSM/EDGE/UMTS/LTE bands. These 3G/4G transceivers transmit at high powerin the range of 24dBmwhich due to insufficient isolation can couple to the GNSS receiver and drastically decrease system sensitivity.

Additionally, BGA825L6S provides a gain value of 17dB that is optimised for different reference design specifications. With its high linearity and optimised gain value the LNA integrated in the receiver chip ensures reliable GPS function without interference from cellular and Wifi signals from adjacent bands

BGA825L6S is in mass production.





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