If by that you meant use an Op Amp with a gain of two to double the control voltage, then that should work. As to datasheets:
http://www.datasheetarchive.com/data...16/165739.html
There's one for an LDR, I don't know which LDR you have. However, it does not seem to have a linearization circuit described on it. But in any case, basic linearization principles apply, and if you can't figure it out, I will go dig out my lab manual and find the relevant data about linearizing thermisters

.