Buried Capacitance

Satellite electronics using buried capacitance PCB technology Select 93 more words to run Humanizer.

What Is Buried Capacitance?

Buried capacitance is a PCB technology that creates capacitance between closely spaced power and ground planes inside the board. A very thin dielectric material separates these copper layers, forming a distributed capacitor across a large area of the PCB.

Unlike discrete capacitors mounted on the board surface, buried capacitance is built into the PCB stack-up. It provides high-frequency decoupling close to the circuits that need it.

This technology can help:

  • Reduce power distribution impedance
  • Improve signal and power integrity
  • Reduce high-frequency noise and EMI
  • Support faster switching circuits
  • Reduce the number of surface-mounted decoupling capacitors in some designs

The word “buried” means that the capacitive structure is located within the PCB layers rather than on the board surface. Buried capacitance is often considered for high-speed digital, telecom, computing, aerospace, and other space-sensitive electronic designs.

Benefits of Buried Capacitance

Buried capacitance can improve PCB electrical performance by placing distributed capacitance directly between the internal power and ground planes. Key benefits include:

  • Reduced electromagnetic interference (EMI)
  • Lower power distribution network impedance
  • Lower plane inductance at high frequencies
  • Improved power and signal integrity
  • Reduced high-frequency noise
  • Fewer discrete bypass capacitors in some designs
  • Less unwanted resonance from discrete capacitors
  • More available space for surface-mounted components
  • Improved reliability through a lower component count
High-speed PCB using buried capacitance for improved power integrity Select 90 more words to run Humanizer.

Buried Capacitance Applications

Buried capacitance is often used in PCBs with high-speed processors, FPGAs, ASICs, and other devices that switch at high frequencies. The embedded capacitive layer helps supply power close to these components while reducing noise in the power distribution network.

Common applications include:

  • High-speed computing systems
  • Telecommunications equipment
  • Network and server hardware
  • Industrial control systems
  • Aerospace and defense electronics
  • Medical electronic devices
  • Compact, high-density PCB designs

Buried capacitance may also reduce the number of discrete high-frequency bypass capacitors required on the board. This can free surface space for other components, but the final capacitor requirements must be confirmed through power integrity analysis.

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