Codesign of an impulse generator and miniaturized antennas for IR-UWB

The codesign of an impulse generator and miniaturized antennas for ultra-wideband impulse radio is described. The impulse generator, discussed by Bragga in 2004, is designed with differential outputs that are fed to the antenna, producing an optimum match of the generator to the antenna, an improved magnitude response, and reduced ringing of the radiated pulse. The impulse generator is preceded by a programmable pulse-position modulator and consists of a triangular pulse generator and a cascade of complex first-order systems, which, in turn, are made up of differential pairs employing partial positive feedback to approximate a Gaussian monocycle waveform. The complete pulse generator is fabricated in IBM 0.18-/spl mu/m Bi-CMOS IC technology. Measurements show the correct operation of the circuit for supply voltages of 1.8 V and a power consumption of 45 mW. The output pulse approximates the Gaussian monocycle having a pulse duration of about 375 ps. Proper modulation of the pulse in time is confirmed. A number of antennas with differentially fed baluns and input impedances of 100 /spl Omega/ have been designed. From measurements, it can be seen that ringing is considerably smaller as compared to conventionally fed antennas.

[1]  Alexander Yarovoy.  Ultra-Wideband Systems , 2003, 2003 33rd European Microwave Conference, 2003.

[2]  G. Geelen,et al.  An inherently linear and compact MOST-only current division technique , 1992 .

[3]  Walter Hirt,et al.  Composite Reconfigurable Wireless Networks: the Eu R&d Path towards 4g , 2022 .

[4]  Robert A. Scholtz,et al.  Multiple access with time-hopping impulse modulation , 1993, Proceedings of MILCOM '93 - IEEE Military Communications Conference.

[5]  Wouter A. Serdijn,et al.  Log-domain wavelet bases , 2005, IEEE Transactions on Circuits and Systems I: Regular Papers.

[6]  Eric W. Justh,et al.  Analogue CMOS continuous-time tapped delay-line circuit , 1995 .

[7]  G.B. Giannakis,et al.  Ultra-wideband communications: an idea whose time has come , 2003, 2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)..

[8]  V. Srinivasa Somayazulu,et al.  Ultrawideband radio design: the promise of high-speed, short-range wireless connectivity , 2004, Proceedings of the IEEE.

[9]  Georgios B. Giannakis,et al.  Ultra-wideband communications: an idea whose time has come , 2004 .

[10]  Xiaomin Chen,et al.  Monocycle shapes for ultra wideband system , 2002, 2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353).

[11]  James D. Taylor,et al.  Introduction to Ultra-Wideband Radar Systems , 1995 .

[12]  Moe Z. Win,et al.  Impulse radio: how it works , 1998, IEEE Communications Letters.

[13]  Nobuharu Aoshima,et al.  Analog Gabor Transform Filter with Complex First Order System , 1998 .

[14]  Ramesh Harjani,et al.  Partial positive feedback for gain enhancement of low-power CMOS otas , 1995 .

[15]  J.H. Zijderveld,et al.  Dielectric wedge antenna for UWB applications , 2005, 2005 IEEE International Conference on Ultra-Wideband.

[16]  H. Schantz.  Planar elliptical element ultra-wideband dipole antennas , 2002, IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313).

[17]  M. Swaminathan,et al.  A digitally adjustable resistor for path delay characterization in high-frequency microprocessors , 2001, 2001 Southwest Symposium on Mixed-Signal Design (Cat. No.01EX475).

[18]  Wouter A. Serdijn,et al.  An interference rejection filter for an ultra-wideband quadrature downconversion autocorrelation receiver , 2005, 2005 IEEE International Symposium on Circuits and Systems.

[19]  A.G. Yarovoy,et al.  Antenna development for UWB impulse radio , 2004, 34th European Microwave Conference, 2004..

[20]  J.R. Long,et al.  A PPM Gaussian monocycle transmitter for ultra-wideband communications , 2004, 2004 International Workshop on Ultra Wideband Systems Joint with Conference on Ultra Wideband Systems and Technologies. Joint UWBST & IWUWBS 2004 (IEEE Cat. No.04EX812).

[21]  H.G. Schantz,et al.  A brief history of UWB antennas , 2004, IEEE Aerospace and Electronic Systems Magazine.

[22]  Nobuharu Aoshima,et al.  Analog Gabor transform filter with complex first order system , 1997, Proceedings of the 36th SICE Annual Conference. International Session Papers.