Analog Devices AB-109 High Speed Precision Rectifier Application Brief

About this manual

The document presents an application brief for a high-speed precision rectifier circuit designed by James Wong. It highlights the use of the OP-27 operational amplifier due to its low offsets and excellent load driving capability.

The text explains the circuit's operation for both positive and negative inputs, noting that matching resistors are critical for accuracy in the inversion mode. Typical component values provided include 30pF for C1 and 2kΩ for Rg, with specific diode recommendations (1N914 and 2N4393). The circuit supports full-wave rectification for inputs up to +10V at frequencies up to 20kHz.

What's inside

• High Speed Precision Rectifier
• Circuit Operation
• Component Values
• OP-27 Operational Amplifiers
• D1 and D2 Diodes
• A1 and A2 Amplifiers
• Frequency Stability
• Power Supply Decoupling

Specifications

Frequently asked questions

Which operational amplifier is recommended for this circuit?

The OP-27 is recommended due to its low offsets and excellent load driving capability.

What diodes were used successfully in the example?

A 1N914 was used for D1 and a 2N4393 JFET was used for D2.

How can packaging density be improved?

An OP-227, which contains two OP-27 amplifiers in a single package, can be used.