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Contents

Digital Electronics

Number Systems

Binary Number System Octal Number System Hexadecimal Number System Number System Conversions Binary Addition Binary Subtraction 1s Complement 2s Complement Signed Number Representation BCD Code Gray Code Excess-3 Code ASCII Code Error Detection Codes Hamming Code

Logic Gates

AND Gate OR Gate NOT Gate NAND Gate NOR Gate XOR Gate XNOR Gate Universal Gates NAND Universal Gates NOR Multi-Input Gates Buffer Gate TTL Logic Family CMOS Logic Family TTL vs CMOS Comparison Logic Level Interfacing

Boolean Algebra

Boolean Algebra Axioms Boolean Algebra Theorems De Morgan Theorem 1 De Morgan Theorem 2 De Morgan Applications Boolean Expression Simplification Canonical SOP Form Canonical POS Form Minterm and Maxterm Relationship K-Map 2 Variable K-Map 3 Variable K-Map 4 Variable K-Map Don't Care Conditions K-Map POS Simplification Quine-McCluskey Method Prime Implicant Chart

Combinational Circuits

Sequential Circuits

Memory & PLDs

ROM Architecture PROM EPROM and EEPROM SRAM DRAM SRAM vs DRAM Flash Memory PLA PAL CPLD FPGA Architecture FPGA vs ASIC

Digital System Design

Propagation Delay Setup and Hold Time Static Hazards Dynamic Hazards Glitches and Races Synchronous Design Principles Clock Skew and Jitter Asynchronous Circuit Design

Other Topics

Other Subjects

Analog Electronics Signals & Systems Control Systems Electromagnetic Theory Digital Communication Analog Communication Network Analysis Microprocessors VLSI Design Verilog HDL Power Electronics Embedded Systems DSP Electronic Devices

Section Progress67%

10 of 15 articles

BCD Code

Binary coded decimal, valid and invalid BCD, BCD addition.

Updated: 19 March 2026

12 min read

BCD Code Quiz

Test your understanding of Binary Coded Decimal encoding and BCD addition rules.

Question 1 of 3

Q1.Which of the following 4-bit patterns is an invalid BCD code?

Related Articles

Excess-3 Code

Self complementing code, BCD to Excess-3 conversion.

4 min read

Hamming Code

Error correction, redundant bits, syndrome calculation.

8 min read

ASCII Code

7-bit character encoding, printable and control characters.

11 min read

Code Converter Circuits

BCD to Gray, Gray to BCD, BCD to Excess-3 circuits.

9 min read

BCD Adder

4-bit BCD addition, correction logic for invalid BCD.

4 min read

Signed Number Representation