ali kotb wrote on Mar 17th, 2012, 2:17pm:here is the ct.
i want to find out the value of -ve resistance across c0 cap
and to be able to draw it vs frequency
also i need to draw the locus of this impedance(polar diagram)
thank u
- Bias the circuit right at the point where current on both branches are exactly balanced.
- In AC open the circuit at the differential nodes where you want to measure the resistance (drains of x-coupled gates devices)
- Apply a differential AC current of 1A magnitude and measure the voltage magnitude and phase as a difference between both drains of x-coupled gates devices.
That voltage should be the resistance you are looking for.