Product Details

Precision Absolute Value Circuit

An absolute value circuit as as a full wave rectifier. Positive input voltqges cause the first amplifier to act as a unity gain inverter. The second amplifier inverts thiis output again to produce a positive outut voltage. Negative input voltages cause the + input of the second amplifier to move positive to a voltage of 2/3Vin. This is multiplied by a gain of 3/2 by the second amplifier also producing a positive output voltage equal to the input voltage.

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.