Design of a monolithic width programmable Gaussian Monocycle Pulse generator for Ultra WideBand radar in CMOS technology

This This paper reports a new width tunable ultra wide-band (UWB) Gaussian monocycle pulse (GMP) generator for radar application. The circuit is a monolithic design in low cost CMOS technology and is area efficient. The GMP is generated with a square wave generator and then differentiated. The square wave generator is actually a glitch generator using a ring oscillator as the input. The differentiator is a one transistor high pass filter, which offers a tunable cutoff frequency over a decade range by simply changing the biasing voltage. The pulse width tuning is accomplished through a binary weighted MOS varactor array. The circuit connecting the pulse generator to the antenna is an active differential balun implemented with only 2 transistors and varactor. Its differential ends exhibit less than 20 [mdB] gain difference in 3-6 [GHz] band. Finally we develop an on-chip dipole antenna for signal transmission.