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Hi guys,
Does Spectre support sweeping multiple variables in the way similar to the .data statement in hspice?
For example, I have 3 parameter, R, L C now, I want to simulate 3 different R, L, C combinations,
R=1, L=3, C=5;
R=5, L=1, C=4;
R=7, L=7, C=2;
Can Spectre sweep the above 3 cases...
Hi LvW, thanks for your help.
I have seen this in PLLs and Delta-Sigma ADCs.
For type 2 PLL, it has this kind of loop filter when you linearize the loop regarding the phase. The loop filter has 2 poles at DC and one low frequency zero, but since pole at DC is not exist in reality, you can...
Hi FvM, the one interview me said it is a stable circuit. I have seen this kind of loop filter in PLLs and Delta-Sigma ADC, and they can be stable, and I just wondering why it is stable, because it acts like positive feedback at wz.
Hi LvW, thanks for your reply. Yes I made a mistake, the phase margin should be 90 degree.
For the circuit I drawn, we can calculate that is transfer function from input to output is
So does it mean if the initial overshoot (or undershoot) is not a problem, when I give the input a sin wave...
Hi guys, I have a problem about the stability of positive feedback.
Let's say for a opam, it has 3 poles (LHP) at DC and 2 zeros (LHP) at wz. Then at DC, its phase shift is -270 degree , and at wz, its phase shift is -180 degree. At wz, its gain is 4.
Then we connect the opam in a unity gain...
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