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standard cell characterization
Thanks for all your help.
I knew the bisection algorithm in hspice. But I think the setup time value calculated by bisection is not a well-exact value. Nowadays, the setup time is defined as follow, there is a typical D-Q delay with an infinite setup time, the...
standard cell characterization
Now I have difficulty in setup and hold time calculation in standard cell characterizing definition. I need to compare the sequential cell delay step by step so I wish I can have program calculation in Hspice like 'for...if..'.
Or I have to use the bisection...
hspice programming
Now I have difficulty in setup and hold time calculation in standard cell characterizing definition. I need to compare the sequential cell delay step by step so I wish I can have program calculation in Hspice like 'for...if..'.
Or I have to use the bisection command in...
Does SPICE simulation include the high order (high frequency) poles/zeros effect in converter system?
I have a boost converter system with variable load. I have compensated the loop with heavy load and the crossover frequency is about 15% of the switching frequency. Then I found when the load is...
3V-0.6um cmos process, less than 20uA quiescent current and switch-c comparator cannot be used. SO which comparator circuit should be better? An OP without compensation is just OK? And under the restriction above, how about the limit of the comparator performance?
And how to measure the...
The external supply voltage varies from 10 volts to several hundreds volts in different apllication. There need to be an internal regulator as the internal ciucuits supply. The output target of the regulator is 5 volts. But the process only provide 40/40(VGS/VDS) N/P MOS and 10/250 LDNMOS. So...
Thanks,nxtech.
Now I want to have a discrete boost converter to be a LED driver. The function is just a little similar like TPS61080, so I take it as a example.
Because I must design not only the attached L, C but also the whole converter loop, I think I should concentrate on the loop transfer...
You mean I cannot design a boost converter to be a LED driver? or a boost type LED driver donot need a exact loop compensation design? But there are many LED driver ICs which are boost converter. You can see the attached TI-tps61080. It can be LED drivers in its applications.
Although, lots of...
My LED driver is a boost converter and now I have problem in the compensation design. What do you mean by compensate automatically? Do you mean that the converter employs a hysteretic controller? But the hysteretic method cannot be used in my design. So the compensation is determined by the loop...
yes.
So the loop transfer function must be calculated well and cannot be adjusted in application. But it depends on the load impendance.
And is there any difference between commom converter and LED driver in loop design?
Hi, nxtech, thanks. But my DC-DC converter is a LED driver, so the output load is LEDs. And the I-V curve is exponential curve. So how can I have the transfer function without the LED. The exponential resistance determine the output load impedance.
Waiting for your further advice!
boost converter transfer function
when caculating the converter transfer function, the pole and zero are determined by the load resistance. when the load is a nonlinear device like LED, the large signal DC resistance is different from the small signal AC resistance. So which one should be...
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