A 0.18¿m CMOS Dual-Band UWB Transceiver

Ultra-Wideband RF Transceive

“…Both MB-OFDM (Ranjan & Larson, 2006;Zheng H et al, 2007;Bergervoet et al, 2007;Beek et al, 2008) and DS-UWB (Zheng Y. et al, 2007(Zheng Y. et al, , 2008 are carrier-modulated systems, where a mixer is used to up/down convert the radio frequency (RF) signal, therefore it requires local oscillator (LO) synthesis. On the other hand, IR-UWB (Yang, C. et al, 2005 ;) is a carrier-less pulse-based system, therefore, we can eliminate the fast hopping LO synthesis, thus reducing the complexity and power consumption of the entire radio.…”

Ultra Wideband RF Transceiver Design in CMOS Technology

“…Both MB-OFDM (Ranjan & Larson, 2006;Zheng, H. et al, 2007;Bergervoet et al, 2007;Beek et al, 2008) and DS-UWB (Zheng, Y. et al, 2007(Zheng, Y. et al, , 2008 are carrier-modulated systems, where a mixer is used to up/down convert the baseband (BB)/radio frequency (RF) signal, therefore requiring local oscillator (LO) synthesis. The main difference between these two systems is that MB-OFDM systems are dealing with continuous ultra-wideband modulated signals while DS-UWB systems are transmitting discrete short pulses which also occupy ultra-wide bandwidth.…”

“…On the other hand, system throughput is limited by a high n. Therefore, high n is usually employed for low data rate systems where the goal is increased communication distance and improved BER. Pulse UWB can be categorized into carrier-based DS-UWB (Zheng, Y. et al, 2007(Zheng, Y. et al, , 2008 and carrier-less IR-UWB (Lee, H. et al, 2005;Zheng, Y. et al, 2006;Xie et al, 2006;Phan et al, 2007;Stoica et al, 2005;Mercier et al, 2008). In a carrier-based pulse UWB system, the baseband pulse is up-converted to RF pulse by a mixer at the transmitter side, and vice verse at the receiver side, therefore a power consuming local oscillator is needed.…”

Frontend ICs for impulse radio sensing and communications

“…Approaches include the use of digitally generated msequences with added filtering [3], base band generation of envelope waveforms with subsequent up-conversion [4], piecewise approximation of mask-conforming waveforms [5] or direct generation using damped relaxation oscillations [6]. The pulse generator reported here employs a quenched-oscillation concept maintaining the circuit simplicity of the damped relaxation oscillation approach, but introducing tunability of the waveform and avoiding the former's reliance on high Q LC resonators.…”