A 6.5-to-8GHz IEEE 802.15.4z-compliant All-Digital UWB Transmitter with Integrated Fast-Settling Master-Slave Regulator

An IEEE 802.15.4/4z standard compliant all-digital UWB transmitter with a fast-settling master-slave voltage regulator is presented in this paper. The proposed digital transmitter (DTX) with the master-slave regulator reduces the power supply crosstalk from the all-digital transmitter operation, which contributes to maintaining decent TX power spectral density (PSD). In addition, the deterioration of DTX PSD is avoided by synchronization of the data stream in the LO domain and the alignment of AM/PM paths in the DTX. Furthermore, wide-band transformer-based impedance matching is introduced in the DTX to achieve high output power with high efficiency while performing the differential-to-single-ended conversion. The presented UWB DTX has been designed in a 28nm CMOS and covers from 6.5 to 8 GHz (Ch5 to Ch9). The DTX achieves 13-dBm TX peak power. The transmitted pulse complies with FCC and ETSI regulations achieving 71% spectrum efficiency and -32-dBr sidelobe suppression.