Implement Full Adder using 1:8 DEMUX | Number System and Code | Digital Circuit Design in EXTC | Summary and Q&A

TL;DR

This video explains how to design a full adder using a 1-to-8 demultiplexer.

Key Insights

• 🫦 A full adder is a circuit used for binary addition of three single binary bits, producing sum and carry outputs.
• 🍹 The truth table for a full adder helps determine the values for the sum and carry outputs for all possible input combinations.
• 🫥 A 1-to-8 demultiplexer can be used to implement the circuit for a full adder, with the inputs acting as select lines for the demultiplexer.
• 🤑 The expressions for sum and carry are obtained by identifying the ones and their corresponding input terms from the truth table.
• 🍹 Separate OR gates are used to realize the circuit for the sum and carry outputs.
• 🔠 The 1-to-8 demultiplexer has one input, an enabled terminal connected to logic one, and eight outputs.
• 🫥 The select lines for the demultiplexer are determined by the inputs of the full adder.

Transcript

Read and summarize the transcript of this video on Glasp Reader (beta).

Questions & Answers

Q: What is the purpose of a full adder?

A full adder is used to add three single binary bits, producing two outputs (sum and carry).

Q: How can a truth table be used to design a full adder?

By creating a truth table that considers all possible input combinations, the values for the sum and carry outputs can be determined through binary addition.

Q: What is the role of a 1-to-8 demultiplexer in the design?

The 1-to-8 demultiplexer is used to implement the full adder circuit. It has one input, an enabled terminal (connected to logic one), and eight outputs.

Q: How are the sum and carry expressions obtained?

The expressions for sum and carry are obtained by collecting the ones and their corresponding input terms from the truth table.

Summary & Key Takeaways

• The video discusses the process of implementing a full adder using a 1-to-8 demultiplexer.

• It explains the truth table for the full adder and demonstrates how to obtain the values for the sum and carry outputs.

• The video then shows how to use a 1-to-8 demultiplexer to realize the circuit diagram for the full adder.