Title :
Evaluating and choosing decoupling capacitors
Author :
Davidson, Lincoln ; Fallah, Ahmad Mahin ; Nelson, Robert ; Rogers, David A.
Author_Institution :
LLC, Analog Design, Fargo, ND, USA
Abstract :
Noisy power busses in printed circuit boards can be a source of radiated emissions and can cause unreliable operation. Improper selection of decoupling capacitors can increase the impedance of the power bus and, as a result, cause an increase in its noise voltage. This paper describes a simple method for evaluating power busses and a procedure for selecting decoupling capacitors to minimize the noise on the system by lowering its output impedance
Keywords :
capacitors; electric impedance measurement; electric noise measurement; electromagnetic interference; printed circuit design; voltage measurement; decoupling capacitors selection; noise minimisation; noise voltage increase; noise voltage measurement; noisy power busses; output impedance lowering; power bus impedance measurement; power busses; printed circuit boards; radiated emissions; unreliable operation; Capacitors; Circuit noise; Circuit testing; Frequency; Impedance measurement; Neodymium; Noise measurement; Power measurement; Power system reliability; Voltage;
Conference_Titel :
Electromagnetic Compatibility, 2001. EMC. 2001 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-6569-0
DOI :
10.1109/ISEMC.2001.950681
