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A low-noise EDGE transmitter implemented in a 65nm CMOS process using direct-conversion architecture for low-band application is presented. The transmitter consists of a programmable-gain I/Q modulator, a frequency divider and a power detector for carrier leakage calibration. The design delivers maximum output power > 1.5 dBm with a 0.5 dB gain step for the 30 dB dynamic range and has < -68...
The quad-band GSM/GPRS transmitter is implemented by using a PLL with an all-digital on-line self-calibration. Based on the all-digital self-calibration algorithm, all RF impairments including VCO gain and loop filter variations can totally be calibrated and repaired all digitally within 1% error. The calibration time is only 50usec by using digital adaptive gain algorithm so that the RF impairments...
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