Modulation of 1 MHz clock with low frequency (LF) signals to analyze common-mode radiation from printed circuit boards

Author

Rostamzadeh, Cyrous ; Steffka, Mark

Author_Institution

Robert Bosch LLC, Plymouth, MI, USA

fYear

2014

fDate

4-8 Aug. 2014

Firstpage

507

Lastpage

512

Abstract

A practical methodology for measurements of common mode RF currents modulated with LF noise on cables for prediction of radiated emissions up to 500 MHz for automotive scenario is presented. More specifically, when microcontroller clock frequency operating at 1 MHz rate, is modulated with a low frequency (LF) signal, emanating from a 1.5 kHz pulse train, or a switch mode power supply (200 kHz), in a printed circuit board (PCB) resulting in RF interference is investigated. A measurement methodology in detection, isolation and mitigation of LF signal at high frequency spectral band is outlined.

Keywords

cables (electric); microcontrollers; printed circuits; radiofrequency interference; signal detection; switched mode power supplies; LF noise; LF signal detection; LF signal isolation; LF signal mitigation; PCB; RF interference; automotive scenario; cables; common mode RF current; common-mode radiation; frequency 1 MHz; frequency 1.5 kHz; high frequency spectral band; low frequency signal; microcontroller clock frequency; printed circuit board; radiated emission prediction; switch mode power supply; Antenna measurements; Automotive engineering; Clocks; Current measurement; Frequency measurement; Frequency modulation; Radio frequency;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility (EMC), 2014 IEEE International Symposium on

Conference_Location

Raleigh, NC

Print_ISBN

978-1-4799-5544-2

Type

conf

DOI

10.1109/ISEMC.2014.6899025

Filename

6899025