samster19
Newbie
Hi, I am building a control amplifier for a VCO. The output voltage of the amplifier will drive a sensing PMOS and a charging PMOS (in the VCO)of 6*12u/1 and 3*15/1.5 each. To compute the load capacitance on the amplifier, I ran a dc on the oscillator to find out the Cgs+Cgd+Cgb of the PMOS's, (input capacitance), but I am not sure I had the right answer because of the sign conventions. Instead, I tied the gates of similar sized PMOS's at the output of the amplifier and shorted the respective drain and source. I am still not sure if I am doing the right thing.
Then I guesstimated the input capacitance of the VCO to be 1pF. Do I have the right values? Please help, thanks!
Then I guesstimated the input capacitance of the VCO to be 1pF. Do I have the right values? Please help, thanks!