An all-digital 8-DPSK polar transmitter with second-order approximation scheme and phase rotation-constant digital PA for bluetooth EDR in 65nm CMOS

This paper reports on a polar transmitter that is capable of 8-DPSK modulation for the Bluetooth EDR standard. It implements the second-order approximation scheme in the gain calculation of the DCO and a phase rotation-constant digital PA. It achieves DEVM of 6.1% at 0dBm output in sending 8-DPSK signal for Bluetooth EDR, drawing 35mA from a 1.2V supply and occupies 0.75χ0.75mm
²
.