CircuitMaker 2000: imported net lists not working.

Started by Anonymous in sci.electronics.design1 year ago 11 replies

With a working schematic loaded that simulates normally I use File > Export > Spice netlist . But when imported it does not simulate. I get just...

With a working schematic loaded that simulates normally I use File > Export > Spice netlist . But when imported it does not simulate. I get just an empty black window. It's been many years, but I’m sure I have done this successfully before.


Class D glitching

Started by Anonymous in sci.electronics.design3 years ago 6 replies

Having a problem with a class D variant design in Spice. This is the output, the hf on af is correct but something's going very wrong at the top...

Having a problem with a class D variant design in Spice. This is the output, the hf on af is correct but something's going very wrong at the top of the waveform. The bad news is I can't show the circuit, which is more than a little limiting, but any ideas of the sort of issue that might cause that with a class D would be welcome. I realise it may well be not much can be said withou


LT Spice powering opamps

Started by John Larkin in sci.electronics.design6 years ago 5 replies

I usually have a couple of "voltage" things off to the side, making +5 and -5 or whatever, and have each opamp with little doglegs on...

I usually have a couple of "voltage" things off to the side, making +5 and -5 or whatever, and have each opamp with little doglegs on its power pins, same net names. Somewhere I thought I saw a circuit where the opamps were powered by little boxes with "+5" or something inside, with no other supply needed. Does that work? If so, how do you invoke it? -- John Larkin ...


Spice modelling of back EMF

Started by Cursitor Doom in sci.electronics.design6 years ago 71 replies

Hi all, I've been unable to get sensible results from simulating the voltage spike inductors generate when their magnetic fields collapse....

Hi all, I've been unable to get sensible results from simulating the voltage spike inductors generate when their magnetic fields collapse. The only possibility I can think of for this failure is that the standard inductor models have insufficient parameters for this purpose and require an extended parameter set. Like many of y'all I use LTspice, btw. Any ideas?


How to select shunt capacitor for class E amplifier

Started by amal banerjee in sci.electronics.design2 years ago

Could some electronics guru please help ? I am trying to do some SPICE simulations for class E amplifiers. How is the shunt capacitor value...

Could some electronics guru please help ? I am trying to do some SPICE simulations for class E amplifiers. How is the shunt capacitor value calculated ? Any hints, suggestions would be helpful. Thanks in advance.


ReRAM ??

Started by Jim Thompson in sci.electronics.design9 years ago 34 replies

An interesting question came up on the LTspice List this morning concerning Spice modeling a ReRAM, a resistive element something like a...

An interesting question came up on the LTspice List this morning concerning Spice modeling a ReRAM, a resistive element something like a Memristor, but "different" ;-) The OP seemed over his head and couldn't quite vocalize how the ReRAM device behaves. I tried surfing and ran into the hurdles that any real information is locked behind the IEEE fiasco. All other links seemed more like...


Could someone please help me understand this ?

Started by Anonymous in sci.electronics.design3 years ago 14 replies

Could some electronics guru here please help me undestand the following. I created the SPICE simulation for a common collector Colpitts...

Could some electronics guru here please help me undestand the following. I created the SPICE simulation for a common collector Colpitts oscillator. The target oscillation frequency is 500.0 MHz, and I am using the HFA3134 RF/microwave NPN transistor, with a Ft of 8 GHz. When the raw transient analysis data is plotted and the resolution adjusted to clearly see individual oscillations, ...


AC Phase Shift In An RL Circuit

Started by EdV in sci.electronics.design10 years ago 26 replies

I am experimenting (LT Spice at the moment) with RL circuits. Given a 30 uH inductor and a 100 ohm resistor in series is there an...

I am experimenting (LT Spice at the moment) with RL circuits. Given a 30 uH inductor and a 100 ohm resistor in series is there an "optimal" frequency to excite this circuit so that changes in the inductance will as measured phase shift most readily?


TINA

Started by John Larkin in sci.electronics.design5 years ago 31 replies

Hi, TI provides models and examples in TINA. What's the learning curve like for TINA? How does it compare to LT Spice? -- John...

Hi, TI provides models and examples in TINA. What's the learning curve like for TINA? How does it compare to LT Spice? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


BD131 Spice Model Wanted

Started by Julian Barnes in sci.electronics.design6 years ago 15 replies

Hi all, It still amazes me after all the years LTspice has been around the standard parts library in it remains so tiny. I don't think this...

Hi all, It still amazes me after all the years LTspice has been around the standard parts library in it remains so tiny. I don't think this long- standing defect in otherwise very good program will ever be fixed. So like anyway, has anyone got a model for a BD131 NPN transistor they could post here? TIA folks. CD


LT Spice .PARAM

Started by John Larkin in sci.electronics.design7 years ago 35 replies

If I say .PARAM RR=50 MX=20 RD=5000/(1.000001-1/MX) it executes from left to right. But what if I have multiple .PARAM...

If I say .PARAM RR=50 MX=20 RD=5000/(1.000001-1/MX) it executes from left to right. But what if I have multiple .PARAM statements, and one calculates a value that another one uses. What order are they executed in? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlan...


inverting switcher

Started by John Larkin in sci.electronics.design2 years ago 14 replies

I have +12 from a wart, and I need -1.2 and -5 to power some analog stuff and ECL. I can do...

I have +12 from a wart, and I need -1.2 and -5 to power some analog stuff and ECL. I can do this https://www.dropbox.com/s/3b0iff93k1k2ct6/TPS_Inv_1.JPG?raw=1 Problem is, I don't want to run Tina and there is no LT Spice model. It may go into burp mode at my modest load currents, so I could get a lot of output ripple. It might want some lead compensation too. I guess I should br...


Quadrature Oscillator

Started by George Herold in sci.electronics.design8 years ago 49 replies

Quadrature oscialltor. Hi all, As part of the CV measurements (from a previous post) I'm thinking about a 1 MHz lockin. (Maybe a different...

Quadrature oscialltor. Hi all, As part of the CV measurements (from a previous post) I'm thinking about a 1 MHz lockin. (Maybe a different thread to talk about how to do the switching.) I was wondering if I could make a quadrature oscillator from opamps. (I've got some AD825's I thought I'd try.) Anyway spice seems to think it's possbile. Comments or ideas welcome. (Oh I had to add th...


LT spice, how to add model lib

Started by George Herold in sci.electronics.design3 years ago 3 replies

Hi all, simple question how do I add a library to ltspice. Lib from...

Hi all, simple question how do I add a library to ltspice. Lib from here. https://www.classe.cornell.edu/~ib38/teaching/p360/lectures/wk12/l35/11.1/74hc.lib I've watched a few videos, but not working so well. George H.


blowing up OPA277's

Started by George Herold in sci.electronics.design5 years ago 17 replies

Hi all, I'm prototyping this square root circuit. (I had a thread here maybe a year ago.) The circuit works fine in spice, but turning it on and...

Hi all, I'm prototyping this square root circuit. (I had a thread here maybe a year ago.) The circuit works fine in spice, but turning it on and off a few times.. (or something) is causing the opamp protection diodes to fail. (All of a sudden the inputs are spitting out DC voltages.) A circuit fragment looks like this, Vin----RRRRR-----+----more of the same...


Circuit Lab

Started by Paul Hovnanian P.E. in sci.electronics.design10 years ago 7 replies

Web-based SPICE application: https://www.circuitlab.com/ Anyone play around with this? Any good? -- Paul Hovnanian ...

Web-based SPICE application: https://www.circuitlab.com/ Anyone play around with this? Any good? -- Paul Hovnanian mailto:Paul@Hovnanian.com ------------------------------------------------------------------ The large print giveth and the small print taketh away. -- Tom Waits


Handling HSpice Files

Started by Jim Thompson in sci.electronics.design7 years ago

HSpice2PSpiceNewEdit.pdf, on the Simulation Tools & Macros Page of my website, has been updated with some new library format...

HSpice2PSpiceNewEdit.pdf, on the Simulation Tools & Macros Page of my website, has been updated with some new library format information. While the title says PSpice, the techniques apply to all Berkeley Spice derivatives... including LTspice ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovati...


LT Spice problem

Started by krw...@att.bizzzzzzzzzzzz in sci.electronics.design11 years ago 26 replies

I'm trying to add the models of a couple of N-FETs I use to LTSpice. I'm getting a simulation-time error that I can't resolve. Any ideas? ...

I'm trying to add the models of a couple of N-FETs I use to LTSpice. I'm getting a simulation-time error that I can't resolve. Any ideas? Thanks. The error: |M1: Only a level 9 B3SOI can have 6 nodes It thinks I have six terminals on my transistor and only SOI models have that many? Looks like only three to me. The circuit: Version 4 SHEET 1 880 680 WIRE 144 -80 16 -80 ...


Electrical friction?

Started by George Herold in sci.electronics.design8 years ago 46 replies

So the thread by Vlad about the Johnson noise of magnetic core losses got m= e thinking about other types of damping. And I was wondering if...

So the thread by Vlad about the Johnson noise of magnetic core losses got m= e thinking about other types of damping. And I was wondering if there is a= n electrical equivalent of friction? It seems to me that it could be a con= stant voltage loss. So maybe just some diodes in an LC circuit? =20 It seems to work, here=92s a spice file. =20 Any thoughts or other ideas are welcome. =20 ...


LT Spice tx lines

Started by John Larkin in sci.electronics.design7 years ago 10 replies

I can't get a transmission line to accept an expression for the delay Td={expr} Z0=50 Either I'm doing it wrong, or there is a...

I can't get a transmission line to accept an expression for the delay Td={expr} Z0=50 Either I'm doing it wrong, or there is a fundamental causality violation or something that doesn't allow it. Seems like a variable delay line is physically OK, but messy. You can certainly build one in real life. -- John Larkin Highland Technology, Inc picosecond timing lase...