Analysis of distortion effects on differential EVM

The impact of transmitter imperfections on the modulation accuracy is analyzed for devices supporting Bluetooth (BT) modulation types with differential phase shift keying (DPSK). Such modulation accuracy is measured in terms of Differential Error Vector Magnitude (DEVM). Impairments such as thermal noise, phase noise, power amplifier (PA) nonlinearity, LO leakage, quantization noise are considered, and simulation results are compared to the analysis.