Capacitor History

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Capacitor History

• 1745, Ewald Georg von Kleist jar based
• 1746, Pieter van Musschenbroek Layden Jar
• Original unit of capacitance was the jar. 1
  jar 1nf
• C Q/V eA/t

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Through-hole and Surface Mount Capacitors
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Surface Mount Chip Capacitors(Rohm Product
Offering)
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Capacitor Value
Capacitor Model
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Capacitor Placement(source Xilinx FPGA
decoupling)

• High-frequency capacitors within 1 to 2 cm of
  each VCC pin
• Mid-frequency capacitors within 8 cm of VCC pins
• Low-frequency capacitors anywhere on PCB
• Bypass capacitor on each Vref pin

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SERDES Layout
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PVdd Decoupling
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AVdd Decoupling