voltage to frequency

[shamooooot]

I need to design a linear R to F converter ,I'm able to change Resis. to volt. linearly but I can't continue ,I tried to make it with the linear VCO but it didn't work in pspice schematic even if I plot it exactly as it's here :
LINEAR VCO - Circuit Diagram - Forum - SeekIC.com
the VCO in schematic :

Q1: to see the out. (sawtooth & square wave)of this ckt in the probe should I run dc/transient analysis cuz all I can see is a constant voltage in tran. on both amps. out. and in there's no DC sweep ?

Q2: how can I in the end show a probe of resistance vs frequency if pspice run dc (no time and freq.), transient(no dc sweep), ac analysis separetly ?

here's the ckt made :

as u can see all sources are dc and after the buffer everythin seems wrong ...
Q3: the capacitor in my ckt seems to has no effect at all ,why ?
THANX THANX THANX I appreciate any comment....

 

[Darkwood]

This is more a specialised subject most on here dont get inolved with, and admittedly is not my strongest field but if your lucky you may get someone on this forum otherwise i see you would be better on and electronics forum.