Скачать или смотреть 2x4 CMOS Decoder in LT Spice || EDA Lab || Experiment 4 ||

📝 Description:
In this video, we design and simulate the 2x4 CMOS Decoder using LTspice, a powerful SPICE-based simulation tool used in VLSI design, digital circuit verification, and standard cell development. The 2-to-4 decoder is a fundamental combinational circuit that forms the basis of memory address decoding, multiplexers, and digital system logic design.

This video provides a step-by-step explanation of how to build the 2x4 decoder at the transistor level using CMOS logic gates (AND, NOT) and verify its truth table using transient analysis in LTspice.

If you’re an ECE student, VLSI beginner, or digital circuit enthusiast, this tutorial will help you understand the logic-level and transistor-level implementation of a 2x4 decoder, bridging the gap between theory and real-world simulation.

🔍 What You’ll Learn
Designing a 2x4 decoder using CMOS logic gates
Implementing AND and NOT logic with PMOS and NMOS transistors
Building a hierarchical decoder circuit in LTspice
Applying pulse inputs to represent binary address lines
Running transient analysis and verifying output waveforms
Understanding decoder truth table and logic verification

🧠 Simulation Steps in LTspice
Open LTspice and place PMOS and NMOS transistors.
Create two NOT gates to generate inverted inputs (A1’, A0’).
Design four AND gates using transistor-level CMOS logic.
Connect the NOT and AND outputs as per the decoder logic equations.
Define A1 and A0 inputs using pulse voltage sources.
Add VDD and GND connections.
Use .tran command to perform transient simulation.
Plot all outputs (Y0–Y3) to verify the decoder truth table.

✅ Observe that only one output line goes HIGH for each unique input combination — verifying correct decoder functionality.

💡 Importance in VLSI Design
Understanding the 2x4 CMOS Decoder helps in:
Digital system design (address decoding, memory selection)
Logic synthesis and standard cell verification
CMOS logic optimization (power, delay, and area trade-offs)
Characterization flows using Cadence Liberate or Synopsys SiliconSmart
Building custom standard cells for ASIC/FPGA design libraries
Learning hierarchical design in SPICE and schematic-based EDA tools
This experiment forms a strong foundation for understanding combinational circuit implementation and EDA tool-based verification in VLSI front-end design.

📚 Topics Covered in This Video:
Logic and truth table of 2x4 decoder
CMOS implementation of NOT and AND gates
Transistor-level decoder design in LTspice
Pulse input generation
Transient simulation and waveform analysis
Decoder application in VLSI systems
Hierarchical schematic design in LTspice

📢 Call to Action

If you are learning VLSI, CMOS Circuits, or LTspice Simulation, this video will help you visualize the working of a 2x4 CMOS Decoder at the transistor level.
👉 Watch the full video to understand the logic, waveform verification, and practical circuit design!
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