A microcontroller configured active analog phase shifter at 1.96GHz

Personal Communications Service (PCS) is one of the most popular digital mobile phone services standards in North America. Its downlink frequency band is centered at 1.96GHz with 60MHz bandwidth. This research presents a microcontroller configured active analog phase shifter at 1.96GHz with phase-shifting range of 90°. The Microcontroller (MCU) increases the flexibility of control circuits and provides additional flexibility to extend the application of the phase shifter to phased array antennas. Applying algorithm to compensate the amplifier's gain-versus-control-voltage non-linear characteristics results in a small RMS phase error of 1.3° with a constant gain (|S21|>1) and increases the transmission power efficiency.