An analog circuit that generate a resistance value from some known parameters

An analog circuit that should work like this.
Right now I have 2 values known, these are the voltage of a node (X Volt) and a resistor (Y Ohm).
This circuit need to interpret X Volt as X Ohm, and then tune the adjustable resistor to Z Ohm (because the Y Ohm resistance and Z Ohm resistance in parallel give us the X Ohm resistance.
The result circuit should work for all the values of known values of the voltage node and the resistor.

I am also interested in solving the problem. Thank you for your inquiry.

Resistance, by Ohm's Law, is V/I. I am not sure how you intend to connect your system up and what it is doing, but I am going to assume you have some computational device like a micro. If you measure both the voltage across the network and the current through it, you can calculate the resistance. You can even monitor each change you make to the adjustable resistor (I assume it is a digital potentiometer) to see what the resultant resistance is.

Of course you will need a micro with a 2 channel A/D (or more) and a method of converting the current to a voltage (something like TI's INA183, but that is just a quick example).

You may be able to get away with an accurate constant current source which would possibly obviate the need for the current to voltage converter, but then it would depend on your configuration.

You can use a MCU with 2 ADC channels.
The voltage can be measured directly, below the Volt accepted by the ADC.
Resistor can measured building a resistive partitor with the central node to ADC input.
The firmware manages all the values.
Cheers.
Giovanni

Hi Kintaro
I hope you are doing well, your question answers This circuit needs to interpret X Volt as X Ohm, and then tune the adjustable resistor to Z Ohm (because the Y Ohm resistance and Z Ohm resistance are in parallel gives us the X Ohm resistance.