Terminology » RF Components » DC Block: Function and Types in RF Circuits

DC Block: Function and Types in RF Circuits

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This page explains the basics of a DC block and its function in RF circuit design. A DC block is a small, discrete device used to block DC voltages in a circuit.

It’s mainly employed in RF circuits to prevent DC voltage from interfering with the main RF signal path. This is crucial for proper operation of RF components.

Figure 1 depicts a typical DC block.

DC Block

Types of DC Blocks

There are three main types of DC blocks, each designed to block DC voltages on specific conductors:

  • Inner DC Block: This type blocks DC voltages only on the inner conductor.

  • Outer DC Block: This type blocks DC voltages only on the outer conductor.

  • Inner/Outer DC Block: This type blocks DC voltages on both the inner and outer conductors. It offers the most complete DC isolation.