®
x2y fIlter & decouPlIng
caPacItors
common mode cHoke replacement
Measꢀred Common Mode Rejection
• Superior High Frequency Emissions Reduction
• Smaller Sizes, Lighter Weight
• No Current Limitation
• Vibration Resistant
• No Saturation Concerns
See our website for a detailed application note with component
test comparisons and circuit emissions measurements.
parallel capacitor Solution
A common design practice is to parallel decade capacitance values to
extend the high frequency performance of the filter network. This causes an
unintended and often over-looked effect of anti-resonant peaks in the filter
networks combined impedance. X2Y’s very low mounted inductance allows
designers to use a single, higher value part and completely avoid the anti-
resonance problem. The impedance graph on right shows the combined
mounted impedance of a 1nF, 10nF & 100nF 0402 MLC in parrallel in RED.
The MLC networks anti-resonance peaks are nearly 10 times the desired
impedance. A 100nF and 47nF X2Y are plotted in BLUE and GREEN. (The
total capacitance of X2Y (Circuit 2) is twice the value, or 200nF and 98nF in this
example.) The sigle X2Y is clearly superior to the three paralleled MLCs.
X2y HigH perFormance power BypaSS - improVe perFormance, reduce Space & ViaS
Actual measured performance of two high performance SerDes FPGA designs demonstrate how a 13 component X2Y bypass network
significantly out performs a 38 component MLC network. For more information see http://johansondielectrics.com/pdfs/JDI_X2Y_STXII.pdf
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www.johansondielectrics.com
JOHANSON [ JOHANSON TECHNOLOGY INC. ]
