MOSFET Common-Source Amplifier ???? Midband Gain, Low-Frequency & High-Frequency Cutoff ???? FULL DE

In this video, we take a detailed look at the frequency response analysis of a Common-Source Amplifier using an n-channel enhancement type MOSFET. The circuit includes four capacitors:

????Input coupling capacitor (C1)
????Output coupling capacitor (C2)
????Source bypass capacitor (CS)
????Load capacitor (CL)

???? To structure the discussion clearly, the content is divided into five main parts:

▶️ PART 1 – MOSFET Model Parameters from Datasheet (ALD1106)
We use the datasheet information to extract the MOSFET model parameters to be used in the next step for DC and AC analysis. Datasheet ALD1106: https://www.aldinc.com/pdf/ALD1116.pdf

▶️ PART 2 – DC Analysis:
We calculate all required DC operating points (bias voltages and currents), which are essential for building the small-signal model in the next step.

▶️ PART 3 – AC Analysis & Midband Voltage Gain:
We develop the small-signal model and calculate the midband voltage gain of the amplifier using standard AC analysis techniques.

▶️ PART 4 – Low-Frequency Cutoff (SCTC Method):
Using the Short-Circuit Time Constant (SCTC) method, we evaluate the lower cutoff frequency by analyzing the time constants associated with C1, C2, and CS.

▶️ PART 5 – High-Frequency Cutoff (OCTC Method):
We apply the Open-Circuit Time Constant (OCTC) method to determine the upper cutoff frequency, considering the parasitic capacitances of the MOSFET (Cgd and Cgs) and the load capacitor CL.

???? What You'll Learn:
✅ How to determine the DC values and how they affect the AC response
✅ How to model the amplifier using the small-signal equivalent circuit
✅ How to calculate the midband voltage gain of the amplifier
✅ How to use the Short-Circuit Time Constant (SCTC) method
✅ How to use the Open-Circuit Time Constant (OCTC) method
✅ How the output coupling capacitor introduces a highpass filter behavior
✅ How to determine the cutoff (corner) frequencies (lower and upper cutoff)

???? Step-by-Step Analysis:
???? Extraction of MOSFET SPICE model and parameters from datasheet (ALD1106)
???? 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
???? Voltage Gain – Calculate using small-signal parameters
???? Lower Cutoff Frequency Calculation – Based on Short-Circuit Time Constant (SCTC) Method
???? Upper Cutoff Frequency Calculation – Based on Open-Circuit Time Constant (OCTC) Method

???? 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
⏩ 00:00:23 Outline Discussion
⏩ 00:01:03 PART 1: MOSFET Model Parameters from Datasheet
⏩ 00:14:41 PART 2: DC Analysis Calculations
⏩ 00:23:05 PART 3: DC Simulation Results TINA-TI SPICE
⏩ 00:24:38 PART 4: AC Analysis for Midband Voltage Gain
⏩ 00:32:26 PART 4: AC Analysis for Lower Cutoff
⏩ 00:47:54 PART 5: AC Analysis for Upper Cutoff
⏩ 00:55:37 Bode Plot Simulation Results TINA-TI SPICE

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