Subsystems and Systems

RSS

RF susceptibility or immunity test systems are often configured as dynamic hardware solutions that address more than one of the ever changing EMC standards. Automation by way of a software driven RF test system controller provides signal routing switch matrices and improves test reliability and engineering productivity.

This article is targeting on a technology of adjustable DC-DC converters, which can be implemented with GSM-GPRS-EDGE power amplifiers, as it is already widely used in CDMA/WCDMA handsets. Simulations show why this has not been used so far and how important the battery average consumption savings could be, with this low complexity technology used instead of a polar-loop architecture, which is under high effort recently in many companies.

This article describes the design and implementation of L-band frequency synthesizer based Local Oscillator to down-convert the uplink signal in a Telecommand Satellite Digital Receiver. An Integer-N PLL scheme was implemented to achieve a compact and low power module. The Local Oscillator when tested with the Receiver successfully achieved all performance parameters for satisfactory operation of the total system.