How to calculate the Resistor Values for an op amp circuit

AI Thread Summary
To calculate resistor values for an op-amp circuit designed to rectify a sinusoidal signal while maintaining a gain of 1, it's essential to clarify whether a full-wave or half-wave rectification is desired. The discussion highlights the need for specific resistor configurations to achieve the desired rectification and gain. The user references an article on a high-resolution resistive probe but focuses solely on a segment of the circuit. Understanding the role of the preceding instrumentation amplifier is also important, although it is not the primary concern for this project. Clear specifications on the type of rectification will guide the resistor calculations effectively.
epcole
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I need help calculating the R values for this circuit from the following article:

AN HIGH RESOLUTION RESISTIVE PROBE FOR NONLINEAR ANALYSIS OF TWO-PHASE FLOWS
L. Cantelli, A. Fichera, A. Pagano

This is only a section of the circuit, there is more but I'm only interested in this part of it. I want to rectify a sinusoid and also to maintain a gain of 1. Has anyone come across something like this? There is an instrumentation amplifier before this but I'm not dealing with that in my project.

Thanks.
 
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epcole said:
I want to rectify a sinusoid and also to maintain a gain of 1.
You want to full-wave rectify it, or half-wave rectify it?
 
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