MOSFET Source Follower 🔥 Low-Frequency Response 🎯 Coupling Capacitors (Gain & Cutoff) 👉 SCTC Method

In this video, we will discuss in great detail the frequency response characteristics of a MOSFET Source Follower Amplifier using an n-channel enhancement type MOSFET. The circuit contains two capacitors; input coupling capacitor (C1) and output coupling capacitor (C2).

We will use the Short-Circuit Time Constant (SCTC) method to determine the time constant associated with each capacitor, and give an approximate formula to determine the lower cutoff frequency. We will also determine the maximum voltage gain of the circuit.

👉 What You'll Learn:
✅ How to model the amplifier using the small-signal equivalent circuit
✅ How to use the Short-Circuit Time Constant (SCTC) method
✅ How the coupling capacitors introduces a highpass filter behavior
✅ How to determine the cutoff (corner) frequency
✅ How to calculate the voltage gain of the amplifier
✅ How the DC operating point affects the AC response

🎯 Step-by-Step Analysis:
🔹 DC Analysis
🔹 AC Small-Signal Model – Replace the MOSFET with its equivalent circuit
🔹 Frequency Response – Effect of the capacitors on voltage gain and cutoff frequency
🔹 Cutoff Frequency Calculation – Based on Short-Circuit Time Constant (SCTC) Method
🔹 Voltage Gain – Calculate using small-signal parameters

🧪 Verification:
All calculations are verified using TINA-TI SPICE simulations for accuracy and practical insights.

💡 Perfect for:
Engineering students, electronics hobbyists, and anyone learning analog circuit design.

🎯 Outline:
⏩ 00:00:00 Introduction
⏩ 00:00:29 Problem Description
⏩ 00:01:40 DC Analysis
⏩ 00:10:23 Small-Signal Parameters
⏩ 00:16:05 AC Analysis
⏩ 00:21:55 Small-Signal Circuit for Frequency Analysis
⏩ 00:28:08 DC Simulation Results TINA-TI SPICE
⏩ 00:28:40 Bode Plot Simulation Results TINA-TI SPICE

👉 Playlist Transistor Circuits:    • Transistor Circuits  
👉 Playlist Analog Electronics:    • Analog Electronics  

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