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CMOS-LOGIC

CMOS 3-Input XNOR Gate

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UPDATED 2026-08-09
TYPECircuit
USE-CASECmos Logic Gate Circuits
EXAMPLECMOS 3-Input XNOR Gate
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CASE ANALYSIS

Scenario

Design of a compact CMOS XNOR gate for custom VLSI digital logic, where a single 3-input exclusive-nor function is needed without relying on a standard-cell library.

Key decisions

  • Decompose XNOR into two cascaded transmission-gate XOR stages and a final inverter
  • Use external complementary inputs (A, A_b, B, B_b, C, C_b) to eliminate internal inverters for the first stage
  • Include one local inverter to generate X_b from the intermediate XOR output

When to reuse this

Suitable when designing dedicated logic blocks in full-custom CMOS, optimizing for area and speed by avoiding pre‑built standard cells.

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