[EE] increasing sensitivity of a thermistor by alan smith .

hi group..me again I want to bounce something off the members. So I have a board that I designed with a 10K thermistor, but its feeding a 3.3V micro (and that is fixed...cant change this part). They have come back and asked for a better resolution. Now a thermistor, it simply generates a voltage as a divider with a source impedance of course. As the temperature changes, the voltage that is generated across it changes, and the resolution of what you can measure is going to be dependent on the source voltage as well as the ADC resolution. So the ONLY way to get better resolution is to be able to increase the source voltage from 3.3V to 5V or use a higher resolution ADC. Now for either case, the micro thats reading this is 3.3V, so using 5V is out of the question. Sorta thinking....using a PIC running at 5V to read the thermistor, and then either using a PWM output (with RC filter) to regenerate a voltage of controlled steps over the temperature range they want to measure (pretty sure its 0 to 100F) for the ADC in their part to measure. Any other possible clever ideas?