Home www.play-hookey.com Fri, 01-20-2017
| Direct Current | Alternating Current | Semiconductors | Digital | Logic Families | Digital Experiments | Computers |
| Analog | Analog Experiments | Oscillators | Optics | HTML Test |
| The Basics | Variations in Feedback Circuits | Mixing Analog and Digital Technologies | Generating Waveforms |
| Operational Amplifiers | Current Mirrors | Differential Amplifiers |
| Integrators | Differentiators | Logarithmic Amplifiers | Non-Inverting Amplifiers | A Difference Amplifier | The Instrumentation Amplifier |
| Increasing the Output Current Capacity | A Precision Half-Wave Rectifier | A Precision Full-Wave Rectifier |

A Precision Full-Wave Rectifier

The half-wave rectifier kept only those parts of the original input signal that were positive (or negative). Is there a way to keep both halves of the input signal, and yet render them both with the same output polarity? This is the behavior of a full-wave rectifier.

A precision full-wave rectifier.

The circuit shown above performs full-wave rectification on the input signal, as shown. If you wish the final output to be positive instead of negative, simply reverse the two diodes in the half-wave rectifier section.

The full-wave rectifier depends on the fact that both the half-wave rectifier and the summing amplifier are precision circuits. It operates by producing an inverted half-wave-rectified signal and then adding that signal at double amplitude to the original signal in the summing amplifier. The result is a reversal of the selected polarity of the input signal.

The resistor values shown are reasonable; the resistors themselves must be of high precision in order to keep the rectification process accurate. If for some reason you must build such a circuit with a different set of resistance values, you must maintain the indicated 2:1 resistance ratio, and you must still use precision resistors in order to obtain accurate results.

Prev: A Precision Half-Wave Rectifier Next: Mixing Analog and Digital Technologies

All pages on www.play-hookey.com copyright © 1996, 2000-2015 by Ken Bigelow
Please address queries and suggestions to: webmaster@play-hookey.com