A 4-to-9GHz IEEE 802.15.4z-Compliant UWB Digital Transmitter with Reconfigurable Pulse-Shaping in 28nm CMOS

This paper presents an IEEE 802.15.4z standard-compliant UWB digital transmitter that features reconfigurable pulse-shaping. The proposed UWB pulse-shaping technique exploits programmable delay lines to achieve high spectrum efficiency and significant sidelobe suppression. An on-chip broadband matching network with a second-harmonic trap is implemented to protect the digital power amplifier (DPA) realized by thin-gate transistors. Implemented in a 28nm CMOS process with a supply voltage of 0.9V, the prototype chip can operate from 4 to 9 GHz at various pulse repetition rates (PRF) from 1 to 249.6 MHz with programmable signal bandwidths (500 ∼ 1331 MHz). The measured transmitted waveform meets with IEEE 802.15.4z standard, and its spectrum efficiency is up to 59%. The output power is highly programmable with a peak value of 14.5 dBm.