Precision Full Wave Rectifier | Simulation | Electronic Circuit Design
Precision Full-Wave Rectifier Using Op-Amps | Proteus 8 Simulation | Analog Electronics Project
Welcome to another Electronic Circuit Design (ECD) project! In this video, we'll design, analyze, and simulate a Precision Full-Wave Rectifier using Operational Amplifiers (Op-Amps) and diodes in Proteus 8 Professional.
Unlike conventional diode rectifiers that suffer from a 0.7V forward voltage drop, this precision rectifier uses the diode inside the op-amp feedback loop, allowing accurate rectification even for very small AC signals. This makes it an ideal circuit for instrumentation, biomedical electronics, audio processing, and precision measurement applications.
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📌 Project Overview
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A Precision Full-Wave Rectifier is an improved version of a conventional full-wave rectifier that virtually eliminates the diode's forward voltage drop. By placing the diode inside the negative feedback loop of an operational amplifier, the op-amp automatically compensates for the voltage drop, creating an ideal diode with an effective threshold close to 0V.
This project uses two operational amplifiers:
🔹 Stage 1 (U1): Precision Half-Wave Rectifier
Configured as an inverting amplifier.
D1 and D2 steer the feedback path depending on the input polarity.
Converts one half-cycle into a positive output with high accuracy.
🔹 Stage 2 (U2): Summing Amplifier
Combines the original input with the Stage-1 output.
Uses a weighted resistor network to reconstruct the missing half-cycle.
Produces a clean full-wave rectified output.
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⚙️ Components Used
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2 × Operational Amplifiers
2 × Silicon Diodes
R1 = 6.4 kΩ
R2 = 6.4 kΩ
R3 = 3.2 kΩ
R4 = 6.4 kΩ
R5 = 6.4 kΩ
AC Signal Generator
Digital Oscilloscope
Proteus 8 Professional
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📐 Theory & Calculations
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Stage-1 Gain (Inverting Amplifier)
A₁ = −(R₂/R₁)
= −(6.4k / 6.4k)
= −1
Stage-2 Output Equation
Vout = −[(R4/R3) × Vstage1 + (R4/R5) × Vin]
Since
R4/R3 = 6.4k / 3.2k = 2
the negative half-cycle is amplified correctly, resulting in a complete full-wave rectified waveform.
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📊 Simulation Results
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✅ Channel A (Yellow): Original AC Sine Wave
✅ Channel B (Blue): Full-Wave Rectified Output
✅ Both positive and negative half-cycles appear as positive.
✅ No noticeable 0.7V diode drop.
✅ Accurate rectification even for millivolt-level signals.
✅ Stable waveform verified using the Proteus Digital Oscilloscope.
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🌍 Applications
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🔹 Audio Signal Processing
🔹 Envelope Detection
🔹 ECG & EMG Signal Conditioning
🔹 Precision AC Measurement
🔹 RMS Converters
🔹 Communication Systems
🔹 Instrumentation Circuits
🔹 Analog Signal Processing
🔹 Data Acquisition Systems
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📚 Concepts Covered
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✔️ Precision Rectifier
✔️ Full-Wave Rectifier
✔️ Half-Wave Rectifier
✔️ Ideal Diode
✔️ Operational Amplifier
✔️ Inverting Amplifier
✔️ Summing Amplifier
✔️ Feedback Compensation
✔️ Analog Electronics
✔️ Proteus 8 Simulation
✔️ Oscilloscope Analysis
✔️ Signal Conditioning
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📂 Download Project Files
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🔗 Proteus Project (.pdsprj):
https://github.com/amirrehman19/Unive...
💻 My GitHub Repository:
https://github.com/amirrehman19
Explore more university projects, Proteus simulations, embedded systems, digital logic, analog electronics, and engineering tutorials.
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👨💻 About This Project
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Electronic Circuit Design (ECD)
Analog Electronics Laboratory Project
Designed & Simulated by Amir Rehman
NUST PNEC
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