Design of Radiated Comb Generator Using Single-Ended Positive Emitter Coupled Logic (Pecl) D Flip-Flop

Abstract

Abstract-Comb generator has been an indispensable tool in the electromagnetic compatibility (EMC) testing field. It is used for calibration and self checking of the test systems. This paper presents a rarely explored yet promising radiated comb generator that makes use of a single-ended PECL D Flip-Flop as the pulse forming component. Measurements show that the generated pulses typically possess fall time and rise time of 330 ps and 410 ps, respectively. Its frequency accuracy is offset by +24 ppm, which is common for crystal oscillators. When being connected to a monopole rod antenna, the comb generator is able to generate radiated emissions that have smooth envelope profile up to 1000 MHz frequency range.

System architecture for a compact high range resolution frequency comb OFDM radar

“…It consists of the five wanted frequency components from −400 MHz to 400 MHz with nearly the same magnitude plus unwanted frequency components at higher frequencies which are damped by at least 9 dB. This relaxes the demand on the further filtering of unwanted frequency components which is an advantage over more widely used frequency comb generation schemes such as those using step recovery diodes [14]. A drawback though, is the higher hardware effort.…”