A 3-5Â GHz low-power high-speed radiated power tuning UWB transmitter

To satisfy the different radiated power requirements for the ultra-wideband (UWB) data transmitting in the implantable electronic devices or the wireless component interconnections, a novel low-power high-speed UWB transmitter with radiated power tuning was proposed. The tunable radiated power is achieved by a UWB RF buffer with a peak value controller. The designed low-complex narrow pulse generator and digital ring on-off VCO ensure a high speed transmitting. The low power is realized by using a subtractor to eliminate the base-band component from the output of the VCO and making the UWB RF buffer and the VCO operating in standby mode. The design was fabricated by a standard 0.18 μm CMOS technology. The test results show that the design can achieve maximum data-rate of 250 Mbps, frequency bandwidth from 3 to 5 GHz, radiated power tuning from −40 dBm to −60 dBm, low-power of 8 pJ/bit, and small circuit area of 0.18 mm2.