An IR-UWB Transmitter Using Two-Dimensional Differential Pulse Position Modulation
An IR-UWB Transmitter Using Two-Dimensional Differential Pulse Position Modulation
Abstract:
This presents a low-power, high-data-rate impulse-radio ultra-wideband (IR-UWB) transmitter that integrates a two-dimensional differential pulse position modulation (2D-DPPM) with time-division multiplexing (TDM) and power-gating (PG) schemes. The proposed 2D-DPPM achieves a modulation order of 9-bit while eliminating the sync pulse required in conventional multipulse pulse position modulation (MPPM). By employing the TDM scheme, all data pulses are generated from a single delay-line-based digital-to-time converter (DTC), reducing power consumption and eliminating mismatch between two delay lines. The PG scheme further enhances power efficiency by dynamically deactivating unused delay cells according to real-time input data. Fabricated in 40 nm CMOS process, the transmitter delivers a data rate of 1.8 Gbps with an energy efficiency of 2.2 pJ/bit. A transcutaneous transmission distance of 11 cm is measured under the condition of applying 15-mm-thick pork tissue and a BER of less than 10−3 .
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An IR-UWB Transmitter Using Two-Dimensional Differential Pulse Position Modulation
