• Single chip GPS/Galileo downconverter
  • GPS L1 band C/A code (1575.42 MHz) receiver
  • 2.7 V to 3.3 V power supply
  • On-chip LNA
  • On-chip PLL including complete VCO
  • On-chip IF Band Pass Filter
  • 50 dB AGC dynamic range
  • SIGN and MAGN outputs
  • PLL lock information
  • Open/Short Antenna control
  • Low power operation 15 mA @ 3 Volt
  • Supports power-down mode


AST-GPSRF is a high performance, fully integrated, RF front-end chip for down conversion and amplification of GPS and Galileo signals. It has been designed for L1 (1575.42 MHz), C/A GPS band receivers and OS Galileo band receivers.

AST-GPSRF is a superheterodyne receiver, with an on-chip low noise amplifier (LNA), local oscillator, one down conversion IF stage (at 4.092 MHz), an automatic gain controlled amplifier (AGC), an on chip IF band pass filter and a 2-bit analog-to-digital converter (ADC).

The down converter works with 16.368MHz reference clock and sampling clock of 16.368MHz is internally generated. The down converter has internal band pass filter, which does not require external calibration. Antenna connection and open circuit can be sensed and the information is made available. The chip can be interfaced with any active/passive GPS antenna.