[input capacitance measurement]

I m using PSPICE to simulate an analog circuit. I have an AC and DC voltage source connected to an RC circuit block. Is there any way to measure the input capacitance of the RC circuit block (like AC sweep)?

Can anyone provide me the ideas or hints to do it?

thanks

[3T DRAM]

Q:Design a 3-transistor CMOS DRAM cell. Show that the read and write operation is functionally correct, capable of operating of at least 100 MHz, and consuming very minimal power.
(input rise time (10%-90%) and fall time (90%-10%) should be at most 1 ns.)
(0.35micron technology)

the information should be available in the cell within 2 ns, i.e propagation delay = 2 ns, and it should be available for another 10 ns (the hold time = 10ns)

=> for write 1 and read 1 operation, what's the steps to determine the capacitance value and (W/L) ratio of the NMOS?

=> please provide the necessary equations

(the 3T DRAM circuit diagram is attached with this message)

thanks