i am designing a control loop that uses a VCO (voltage controlled oscillator) as the actuator to control the plant. the vco is already a pre-designed product and for the frequency range i am interested in, i know that i need to input some number (not necessarily an integer) to the VCO input, to get the desired frequency. for those curious, the range is between 3V and 11V.

my question is, how can i generate these "numbers" so that i can get the appropriate frequency for my plant? i have a control loop which is calculating an error voltage, but this number is in the range of mV. I don't think the solution is as simple as scaling this value either.

So, i'd like to know of there is there a way i can get my compensator to output the "correct" voltage for me? Im not sure if this is possible (and what parameters in a compensator would actually affect this) and how this would affect the stability of my closed loop system.

tia