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Using Pre-Filter LNA Modules To Improve Receiver Sensitivity During Simultaneous GPS Operation
By ChewEan Tan and Allen Wong, Avago Technologies
Cellular phones are getting more complex with each new generation, integrating multiple radios such as WiFi, Bluetooth and GPS. With the increasing number of wireless signals present, designers must leverage strong filtering technology to avoid interference in handset designs. This is especially true for GPS functionality.
For a Simultaneous Global Positioning System (S-GPS), the reception of GPS signals and the transmission of voice or data signals occur at the same time within a handset. The signal from the voice or data transmission may leak over to the GPS receiver's path and affect the receiver's sensitivity by overloading its low noise amplifier or back-end. This creates a formidable challenge for handset designers, as they must determine how to maintain the sensitivity of the GPS receiver for the weak incoming GPS signal, while there is a strong interferer signal from the transmitting voice or data. This requires a GPS receiver front-end with very good blocking of the strong interferer signals, while also providing low noise figure and high gain for the weak GPS signal.
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