Why is this post "Mixed-Signal Design" issue ? Is there any "Mixed-Signal" ?
hchanda wrote on Feb 13th, 2009, 3:16pm:I would like to understand this concepts intutively not based on mathematical equations.
I don't know a topology of your negative impedance generator.
Assume an ideal current drive(Iin=1A) of a simple negative impedance generator consisted from C1, C2 and Transistor.
And current of C2 is sum of current of C1 and current from Transistor.
Here former current is equal to Iin, latter current is gm*Voltage_C1 which is 90degree different from Iin.
So there could be negative real part in total sum voltage of C1 and C2.
This can be understood if you draw vector(phasor) diagram of Iin, Vc1, Vc2 and Vc1+Vc2.