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Hi:
I have a small question about this opamp compensation as shown below. the feedback is not shown but you can see C2 is used as the compensation cap. on the other hand, there is a RC filter (R1-C1) used at the output of the 1st stage folded-cascode amplifier. This block indeed improves the...
Hi:
I am going to design a 2-stage doubler-based charge pump with 1.5v input, 3v and 1.5mA output. clock freq is around 200Mhz.
I wonder if there is any methodology on how to find a proper pumping capacitance in each pump stage? should it be based on efficiency or area?
thank you very much
Hi:
I am designing a folded cascode with systematic offset spec less than 100uv. Attached is the schematic of the circuit (biasing transistors have the same dimension as those in the ota ). the max systematic offset at this moment is 600uv. can anyone give me some tip on where to go to reduce...
Hi:
I have a question about determining the zero freq of the opamp by inspection. Is there a way for getting zeros like what we usually do for poles: [lumped C to gnd] x [resistance of the node]. Is it related to the RC on feed forward path?
The intention is not to get accurate result but to...
Hi:
I am an analog newbee who is still digging into the books for design techniques.
I wonder in the real design, do the expierenced people really try to characterize those K values from models and use square law to get the first estimation of the device dimensions? I see all the books are...
thanks a lot
Hspice use gausian method to get the solution of a matrix, so the dependency will be exponential
Spectre may be a different, it may divide the circuits and some them simultaneously, the dependency is between linear and exponential
thanks for the reply. do u know where I can find...
linear to exponential
Hi:
any rough idea on the computational complexity (simulation speed) of Hspice or Spectre? I only know it is strongly dependent on the number of internal nodes of the circuit because Spice have to make matrix of it. is this dependency linear or exponetial, etc?
thanks a lot
I would say the important thing is whether or not you want to catch those extreme values or "outliers". If they are not important, 30 is enough to have an idea
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