Operational Amplifiers – Complete Theory
Page 13 – Precision Rectifier (Super Diode)
A Precision Rectifier is an op-amp circuit that rectifies signals without the voltage drop normally caused by diodes.
It is also called a Super Diode.
Problem with Normal Diodes
Ordinary diode rectifiers require a minimum voltage:
Vd ≈ 0.7 V (Silicon diode)
This causes errors when rectifying small signals.
How Precision Rectifier Works
- Uses an operational amplifier with a diode
- Op-amp compensates the diode voltage drop
- Allows rectification of very small signals
Operation
Positive Input Cycle- Op-amp output drives the diode forward biased
- Output follows input signal
- Diode becomes reverse biased
- Output becomes zero
Key Advantage
Rectifies signals even smaller than 0.7 V.
Applications
- AC voltmeters
- Signal detectors
- Peak detection circuits
- Audio signal processing
GATE Important Points
- Also called Super Diode
- Eliminates diode threshold voltage error
- Used for small signal rectification
- Improves measurement accuracy
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