A Novel Low Power High Speed Gbps UWB Transmitter Design Using Fractional DTC and High Spectrum Efficiency Intra-Chip PPM

This brief proposes a novel impulse-radio ultra-wideband (IR-UWB) transmitter circuit and system for high-speed wireless communication with a fractional digital time converter (DTC) and high spectrum efficiency modulation named as intra-chip pulse position modulation (Intra-Chip PPM). The transmitter achieves high precision and high dynamic range simultaneously combining counter and delay line for integer and fractional part of delay respectively. The maximum delay control range is 8012.8ps while the minimum delay resolution is 0.4ps, which is achieved by on-chip calibration of delay line, providing precise position information for high-speed Intra-chip PPM and multi-rate pulse modulation. The circuit of whole transmitter is designed and simulated with 40nm CMOS process. The simulation results show that the proposed transmitter can achieve maximum data rate of 1996.8Mb/s and energy efficiency of only 6.2pJ/bit.