Quad-band GSM/GPRS/EDGE polar loop transmitter

An EDGE transmitter, using a non-linear GSM type PA, is presented. A dual feedback loop ensures robust performance even under VSWR variations. No isolator or external PA filtering is required. The EDGE spectral mask is met with an RMS EVM of <3% at 29 dBm at the antenna, corresponding to 2 dB above nominal maximum output power.