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Re: differences between LTSpice models and IR models
boB, The standard SPICE diode model uses Tt to model reverse recovery, and thereby, stored charge. The diode capacitance will also have some effect on the dynamic reverse current. This model is
By Rick · #64815 ·
Re: differences between LTSpice models and IR models
Sorry to beat a dead horse (I like horses), but did anybody ever figure out if LTspice can actually simulate reverse diode recovery properly or not ??? I see Helmut's postings too, (msg_43634), but
By boB G · #64814 ·
Re: New file uploaded to LTspice
Leo, This file should fix your transformer windings and circuit stability over the 18 V to 30V range. I did not address the ZVS issues but looks like a piece of cake. If you need more help just ask.
By Harry Dellamano <harryd@...> · #64813 ·
Re: Help! How do I do find maximum signal easily!
Hi Macy, Personally I use version control systems for all my code, so I never have any doubt as to what is going on. Cheers, Dave
By David Hawkins · #64812 ·
Re: Help! How do I do find maximum signal easily!
Andy, Thanks I was just going to try using the + at the start of shorter lines. Actually, the humongous long line is easier to cope with than I thought. Now that David pointed out I can ctrl, right
By Macy · #64811 ·
Re: Help! How do I do find maximum signal easily!
David, YES! ctrl, right click works! didn't know about that ability. [Mike, thanks for anticipating] Problem with the versions of multiple files, is that by necessity they all have the same name!
By Macy · #64810 ·
Re: Current source behaviour in 'active load' mode
There are probably dozens of ways to do this in LTspice. Here is one way that uses just one device (a V-I table I-source): I1 0 1 TBL(-5 0 {1u-5} 1 0 1) ; 5V 1A PSU with 1uV of droop R1 0 1
By analog spiceman · #64809 ·
Re: Current source behaviour in 'active load' mode
Hi. Look: http://tech.groups.yahoo.com/group/LTspice/files/%20Examples/Apps/Ideal_voltage_source_current-limit.zip Ideal voltage source current-limit. Series resistance=0. The model is made for
By §¡§Ý§Ö§Ü§ã§Ñ§ß§Õ§â §¢§à§â§Õ§à§Õ§í§ß§à§Ó · #64808 ·
Current source behaviour in 'active load' mode
Hi, I've been playing with the current source element with the 'active load' box checked. I place this in series with a voltage source and a resistive load (e.g. to model a PSU with current limit) and
By redblack001 · #64807 ·
Re: RF Frequency Tripler design
Jeff, Well, 2 diodes connected anode to anode and cathode to cathode would a parallel connection. Anti-parallel is 2 diodes connected anode to cathode in parallel.The additional diode results in the
By jmulchin1 · #64806 ·
Re: RF Frequency Tripler design
Long long ago and far far away, I designed varactor triplers for 100 watt transmitters to go from 150 MHz to 450 MHz. Even in the day I had some kind of model for the varactor for the pre-SPICE
By Jeff AE8W · #64805 ·
RF Frequency Tripler design
I'm trying to design a 240MHz to 720MHz tripler circuit and wonder if anyone has an example circuit I could follow. The goal is to use anti-parallel PIN diodes, so an example using PIN diodes would be
By jmulchin1 · #64804 ·
Re: AD734 Multiplier: Basic Circuit: ac simulation uses parameters from transient
You also need to realize that an .AC analysis is a small-signal linearized analysis. The multiplier, which is an inherently nonlinear device, is presumably linearized at the operating point, and
By Andy I · #64803 ·
Re: AD734 Multiplier: Basic Circuit: ac simulation uses parameters from transient
FYI ... after running an AC analysis, if you hover the mouse pointer over any net, look in the lower left corner where LTspice will tell you the DC operating point voltage on that net. Andy
By Andy I · #64802 ·
Re: AD734 Multiplier: Basic Circuit: ac simulation uses parameters from transient
Maren (distheo@...) wrote: a) Why is the .ac simulation influenced at all by the parameters of the In an .ac analysis, LTspice first needs to find the operating point. All voltage and current
By Andy I · #64801 ·
Re: Determining the value of a variable at time t-1
The idea I will give you is to open Help in LTspice; Then go to LTspice > Circuit Elements > B. Arbitrary Behavioral Voltage or Current Sources. Scroll down and find the first table of functions. Andy
By Andy I · #64800 ·
Re: Help! How do I do find maximum signal easily!
Macy wrote: I like the idea of 'including' the file with everything in it then I can Well, you've got a choice. You can either (1) keep everything on the schematic, or (2) move stuff off the schematic
By Andy I · #64799 ·
Re: Determining the value of a variable at time t-1
Look up the behavioral B source function, absdelay( x, t [, tnax] ) in the LTspice Help File. Howard
By Howard Hansen · #64798 ·
Re: Help! How do I do find maximum signal easily!
Hi Macy, If the SPICE directive is something like .step or .param, you can just right click. If the SPICE directive is something that the simulation GUI normally deals with, then the GUI pops up,
By David Hawkins · #64797 ·
Re: Help! How do I do find maximum signal easily!
now there are 'comments' on the schematic .ac dec 500 10 100k .noise V(out) Vsource dec 500 10 100k .ac LIST this goes forevers..... .noise V(out) Vsource LIST ditto..... [Thanks for suggesting LIST.
By Macy · #64796 ·