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hi
i need to use an ideal voltage buffer in hspice, how can do it? is there any default model of voltage buffer in hspice? if not,how can i add a model by myself?
please give me answer or reference, thanks very much
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of cource it should be noted that i want to buffer a DC...
Re: what does mean "frequency trimming " in oscillators
thanks i read your worth answers, i think get the general point of frequency trimming. i guess frequency trimming is a optional or manual way for tune or trim the output frequency of an oscillator. for example with a variable...
hi
i need information about frequency trimming, i want to know what is frequency trimming and information about it's basics, please help me and if you know any reference in this subject introduce to me, thanks
hello and thanks very much dear pferenc
i saw your attachments, i think the basic principle used in your method and for mine is same, i can exactly understand the basics of method is used for measuring a effective equivalent capacitance for output of inverter, but i have a problem with spice...
i really expect somebody answer me:sad:
since nobody answers i did my own things, first i set AD,AS,PD and PS to zero and then increase the input trigger pulse width such that the inverters can response correctly to the input pulse and hspice can correctly measures invf,capf,invR and capR times...
thank's again for your good answer, i do the optimization and i obtain a value in hspice output equal to 119f, now i don't know what is this amount exatly? the gate effective capacitance or cpermicron?
i need the total load capacitance of inverter, i read in the book that we must set all of the...
i have a ring oscillator with a VCTRL (control voltage) that control the oscillation frequency, i want to change the temperature (for example by .temp syntax) and then change the control voltage until the oscillation frequency return again to the initial value, can i use hspice optimization to...
thanks very much again for your answers,it helped me
i have a ring oscillator with a VCTRL (control voltage) that control the oscillation frequency, i want to change the temperature (for example by .temp syntax) and then change the control voltage until the oscillation frequency return again to...
I am VERY grateful to you:-P.your answer was very usefull for me and i read that book and i got the main strategy for evaluating the capacitance in that way,
we must change cdelay until the measured delay between nodes c to d is equal to delay between c to g, and then the amount of cdelay...
for a sensitive use, i need the load capacitance at the output of a inverter in a 3 stage ring oscillator in a specific temperature, also i need the oxide capacitance at the same temperature (and so i need know the eox in that temperature),
i don't know how i can get the exact capacitance and...
hi, thanks for your answer
-10 mega hertz i mean
-about why chebyshev filter, i mistook and i meant butterworth filter because i saw its response and i guessed it' would be appropriate.
- and about the slope of the filter in transition region, in fact i want to use this filter as a frequency to...
Hi all
As I said I need a lowpass filter with cutoff frequency around 10Mhz, the most important thing i need is that the filter response in transition region is linear as much as possible,and it decrease monotonically because I use the filter In this region and it is important that filter...
i need to know the output capacitance in a output of each stage of a cmos ring oscillator, i know the capacitance is voltage dependent but i need a value for my calculation, i can calculate the capacitance by hand calculations (by using of formulas from digital integrated circuits,by john.M...
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