A GPS Amplifier is a modular device for the amplification of GPS RF signals.  The amplifier sits in the path from the antenna to the receiver and is intended to improve the signal amplitude of L1 (1.57542GHz) and L2 (1.2276GHz) carriers. Modules typically have N-type, SMA or TNC connectors for the 50 Ohm RF input and outputs and are externally powered.

 

GPS signals are typically 20dB below the ambient noise floor and are highly susceptible to signal deterioration.  GPS Amplifiers typically utilize a high gain, low noise amplifier (LNA) designed to amplify GPS, Galileo, Glonass or BeiDou signals. Some modules have variable gain capability. LNAs are implemented on high-frequency processes like Silicon Germanium (SiGe). This provides better noise figure and good intermodulation characteristics. Good intermodulation characteristics in the amplifier are important as they help to protect a subsequent receiver from interference products. GPS receivers have poor selectivity and can easily be desensitized or blocked by interference signals.

 

Certain GPS amplifiers have output level controls available to compensate for the effective radiated power (ERP) levels in a system. They also can have antenna fault detection and serial remote control capabilities.