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Re: Cmos 4026
Business Kid
I thought I was the only one with any 4000 chips left. I never saw or met the 4026. There are a few on ebay if you want to prototype :-) I am guessing that you are simulating an idea which you are going to program. Use a separate 74xx counter and 74xx bcd decoder chip if you must, but I also fail to see the point. And I have stopped thinking in 4xxx logic, because they are not recommended for new designs, to put it mildly.On 14 December 2013 10:55, <xcheta1@...> wrote:
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A Noisy Question
Greetings folks -
I have a question about modeling noise in a real system. Lets say I start with a uniform distributed sequence of random values with a span of +1 to -1. I know that I can average over N of these values and get a Gaussian sequence with a mean of zero and a standard deviation of 0.5. This much is pretty easy. Now, these values represent discrete time samples. How do I turn them into real signal that has a defined bandwidth? Yes, I can put the sequence through a low-pass filter, but I have to define a time interval between samples. Do I need to set this time at 1/10X the filter bandwidth? 1/100X? And, does it matter whether I take the values as though the output of a first-order sample/hold, or do linear interpolation between them? Or something else? And, what sort of filtering is normally assumed? Single pole? Two or three poles? Yes, this is for an LTspice project. And, the reason I am being a bit coy about specific values is that I would like to apply this in a variety of communication systems with varying operating frequencies and bandwidths. In some cases, the system bandwidth will be very broad (maybe 100 MHz) encompassing HF frequencies with lots of ambient noise as well as VHF that is much quieter. Thanks Jim Wagner Oregon Research Electronics |
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Convert ADS and/or AWR (MWO) RF FET Models to SPICE
Does anybody know how to convert RF FET models that were made for ADS or AWR (MWO) to SPICE models.? Seems some RF device manufacturers (NXP, Freescale, ...) do not make SPICE models for their parts.? Not good if you can't afford one of these expensive simulators.
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Re: i need help
Then ask in the Hspice list?
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Show quoted text
Jim Wagner Oregon Research Electronics On Dec 14, 2013, at 5:01 PM, Á¢ Çf wrote:
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i need help
?I really need ?the hspice netlist of Dflipflop with reset please help me><~~ i already have dflipflop without reset .SUBCKT DFF gnd vcc d clk q q_bar X1 gnd vcc 1 2 3 nand2 X2 gnd vcc 3 clk 2 nand2 X3 gnd vcc 2 clk 1 5 nand3 X4 gnd vcc 5 d 1 nand2 X5 gnd vcc 2 q_bar q nand2 X6 gnd vcc q 5 q_bar nand2 .ends .SUBCKT nand2 gnd vcc a b vout ?? Mx1 vout b vcc vcc ?p w=1.5u l=0.18u Mx2 vout a vcc vcc ?p w=1.5u l=0.18u Mx3 vout a 2 gnd ?n w=1u l=0.18u Mx4 2 b gnd gnd ?n w=1u l=0.18u .ENDS |
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hspice netlst
I really want the hspice netlist about d flip flop with reset!!
someone know it?? please told me~~ ex:d flip flop without reset .SUBCKT DFF gnd vcc d clk q q_bar X1 gnd vcc 1 2 3 nand2 X2 gnd vcc 3 clk 2 nand2 X3 gnd vcc 2 clk 1 5 nand3 X4 gnd vcc 5 d 1 nand2 X5 gnd vcc 2 q_bar q nand2 X6 gnd vcc q 5 q_bar nand2 .ends .SUBCKT nand2 gnd vcc a b vout ?? Mx1 vout b vcc vcc ?p w=1.5u l=0.18u Mx2 vout a vcc vcc ?p w=1.5u l=0.18u Mx3 vout a 2 gnd ?n w=1u l=0.18u Mx4 2 b gnd gnd ?n w=1u l=0.18u .ENDS |
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Re: LTSpice 4026
Xcheta1 wrote, "...? This is one of those situations that makes me ask, Why do you want to simulate that?
I don't mean that there isn't a good reason. ?I just don't see one.
The CD4026 is a digital counter, with digital inputs and outputs. ?SPICE is used when you need to know whether some voltage is 8.47 volts or 9.75 volts; or if you need to know the risetime, or to look for overshoot ... things of an analog nature. ?Those things MIGHT be concerns, but often they are not. ?When the wires or PCB traces are short, often you can just hook up the ICs, and it works, without having to know the voltages with millivolt precision.
Just wondering.
Regards,
Andy |
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LTSpice 4026
HI there,
I Would like to build a speeometer. My plan was that i use the CMOS 4026 because i need the Carry Out for my 7-Single-Digit-Nummeric Display but in LTSpice i can?t find the 4026 to Simulate my circiut. Please help my i search a alternate component for the CMOS 4026 with the same application and where i can use at LTSpice. Thank you for Help Xcheta1 |
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Re: LTspice models
John Woodgate
In message <1386959812.25712.YahooMailNeo@...>, dated Fri, 13 Dec 2013, Milan Djordjevic <inductpower1984@...> writes:
I became a member of your group, because to him that the user of the simulator and need some models.Your message cannot be understood. Please get a friend to help you to write in better English. You may be able to get an on-line translation of your message from your language to English. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Nondum ex silvis sumus John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK |
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Perl Optimizer initiation problems
Hi Friedrich,
We are trying to test your Perl Optimizer tool from 2005. We followed the steps mentionned in the starter.doc but we got some problems. The version of ActivePerl changed since 2005 and we don't have access anymore to the older ones (5.08 or 5.10 ...). We?tried to install the newer versions but we got a problem when it tried to search for Tk.pm in the libraries.? It appears that the newer versions replace the "Tk" with "Tkx" everywhere (lib, bin ...). We tried to create a copy of all these files and replace the Tkx with Tk but this generated a new problem: "can't locate object method new via package mainwindow ...". We are asking if there's an alternative solution for that problem (having the older version of ActivePerl or having access to the code to see if it is duable to make it compatible with the new version ...). Hope you have the solution,? Thanks in advance, Jad |
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schematic tag stretching off-window
Opening up a schematic from some time ago, I was presented with a display in which node identifying tags were extended off-window. Snap-shot here:
http://www.magma.ca/~legg/TVS/tag_stretching.jpg Oddly, it affected only later revisions of the same .asc file in the same folder. The difference being that some voltage sources were assigned non-static values. Looking at the text in these files shows no differences in the tag art references. Some files show normally until you try to run or alter them - in which case the tags suddenly begin to show the distortion. RL |
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Re: Bug in Version 4.20d
Hi Helmut, and all ...??? Yes, after update of 4.20c I immediately found this problem (because I am working on my program, using this feature, and it showed me promptly the problem). I reported to Mike in few minutes after update. The note in Change.log and the "e" version is the result of that prompt reaction. Now, everything is working well. Best regards, Peter |
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