A 52 pJ/bit ook transmitter with adaptable data rate

Abstract

A 433-MHz OOK transmitter with adaptable data rate is presented. The proposed circuit completely turns off the transmitter during the transmission of '0' and employs a speedup scheme to obtain high data rates and low wake up time. The data rate can be adjusted and adapted to the need of applications. Realized in a 0.35-μm CMOS technology, the OOK transmitter has a measured output power of -12.7dBm with a dc power consumption of 560 fiW under a 1-V power supply, and a data rate of 3 Mb/s, yielding an energy efficiency of 187 pJ/bit or 3.48 nJ/bit/mW if normalized to the transmitting power. When the proposed speed-up circuitry is enabled, data rate increases to 10 Mb/s, with a dc power consumption of 518 fiW achieving an energy efficiency of 52 pJ/bit or 0.97 nJ/bit/mW when normalized.©2008 IEEE.