## Forums Search for: Spice

## Hoq to measure capacitor Q from SPICE

inCould some electronics guru here shed some light on this ? How do measure Q for say a capacitor using SPICE simulation ? I know how to measure...

Could some electronics guru here shed some light on this ? How do measure Q for say a capacitor using SPICE simulation ? I know how to measure reflection coefficient, insertion loss and SWR from a SPICE AC analysis. Any hints/pointers in regard to the Q measurement with SPICe simulation will be greatly appreciated. Thanks in advance.

## SPICE model for BLDC ??

inI have created SPICE models for simple DC motors, and I am curious if any electronics guru could point me to a SPICE model for a brush-less DC...

I have created SPICE models for simple DC motors, and I am curious if any electronics guru could point me to a SPICE model for a brush-less DC motor. I have searched on Google, but the SPICE models on various Web sites always seem to be for the simple DC motor. Thanks in advance for your help.

## semicolons in LT Spice

inLT Spice XVII is in my opinion a little weird about the simulation command pull-down menus. So people wind up editing sim command lines to...

LT Spice XVII is in my opinion a little weird about the simulation command pull-down menus. So people wind up editing sim command lines to insert and delete semicolons to enable various sims. I switch other kinds of Spice directives on and off by right-clicking and changing the line from "spice directive" to "comment", which is easier than editing semicolons. I emailed Mike Engelhardt ...

## SPICE model for brushed DC motor -- some questions

inCould some electronics guru please shed some light on this ? I created a SPICE model for a simple brushed DC motor. It is complete as it...

Could some electronics guru please shed some light on this ? I created a SPICE model for a simple brushed DC motor. It is complete as it includes the models for torque and inertia. When excited with a SPICE pulse or piece-wise linear model, the armature current, when plotted shows the upward and downward spikes, of the correct amplitude, as expected. Now when I replace the SPICE p...

## Explanation of SPICE Parameters

inI can't find any useful references for MOSFET SPICE parameters. Does this information exist entirely in book form, or something? Example:...

I can't find any useful references for MOSFET SPICE parameters. Does this information exist entirely in book form, or something? Example: websites copypasting the SPICE 3f5 handbook. This says more-or-less what the parameters are (e.g., doping density of so-and-so, etc.), but not how they're used, what they do (no formula, no description, no intent). Even the ones that do (e.g., HSPI...

## Looking for SPICE models of common MESFETs

inHappy New Year to you all. Could someone please direct me to a site or URL for MESFET SPICE models. All I find from Google searches are S...

Happy New Year to you all. Could someone please direct me to a site or URL for MESFET SPICE models. All I find from Google searches are S parameter values at high frequencies which are equally important, but no SPICE models. Thanks in advance for your help.

## Astable multivibrator with MOSFET SPICE model

inCould some electronics guru point me to a working(i.e., correctly simulates) astable multivibrator SPICE model with MOSFET only. I have two...

Could some electronics guru point me to a working(i.e., correctly simulates) astable multivibrator SPICE model with MOSFET only. I have two working BJT based astable multivibrator SPICE models. However, my MOSFET based astable multivibrator model, works as per hand calculation, but shows no oscillations with a regular SPICE .TRAN analysis. I have tried the standard SPICE tricks, as havi...

## Which spice?

inWant to run spice on this machine. Its running Avlinux 6.04, debian based to some extent. Package manager lists: gwave - waveform viewer...

Want to run spice on this machine. Its running Avlinux 6.04, debian based to some extent. Package manager lists: gwave - waveform viewer for spice simulators easyspice - graphical frontend for spice ngspice gspiceui - graphical user interface for ngspice & gnucap gnucap - circuit analysis package Presumably I'd pick ngspice, which I've not encountered before, does it need easyspice ...

## PDF in Spice

inI've had a few instances where I was interested in seeing the probability density function of a waveform, the voltage histogram, in LT...

I've had a few instances where I was interested in seeing the probability density function of a waveform, the voltage histogram, in LT Spice. I never came up with a decent way to display that within Spice. Any ideas? -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtec...

## LT Spice question

inHi, I have the AD8014 Spice model from Analog Devices, and I have LT Spice. The model file AD8014.cir starts with... AD8014 SPICE...

Hi, I have the AD8014 Spice model from Analog Devices, and I have LT Spice. The model file AD8014.cir starts with... AD8014 SPICE model * Node assignments * non-inverting input * | inverting input * | | positive supply * | | | negative supply * | | ...

## How to model mutial inductance in SPICE

inCould some SPICE guru please help. I am trying to mofrl two parallel wires, each of diameter 'd' mm, of length 'l' mm , separated by 's' mm....

Could some SPICE guru please help. I am trying to mofrl two parallel wires, each of diameter 'd' mm, of length 'l' mm , separated by 's' mm. These two inductors will have both self(each) and mutual inductance. They can be modelled in SPICE as two parallel inductors as follows: L0 START0 END0 L1 START1 END1 k0 L9 L1 0.99 where 'k0' is the coupling constant < So, now is the

## How to compute reflection coefficient from SPICE AC analysis

inCould some electronics/SPICE guru please shed some light on this ? I was told that the reflection coefficient for a circuit, e.g., a L...

Could some electronics/SPICE guru please shed some light on this ? I was told that the reflection coefficient for a circuit, e.g., a L impedance transformer can be estimated from the frequency response plot of its SPICE AC analysis. If so, where could I get some details of the calculation steps. Thanks in advance.

## e-phemt Spice model

inThe MiniCircuits SAV-551 is a cool part, but they don't have a Spice model for it. They are classic s-parameter type folks. Does anyone...

The MiniCircuits SAV-551 is a cool part, but they don't have a Spice model for it. They are classic s-parameter type folks. Does anyone have a model for this part, or something similar that could be fiddled? I'm playing with Colpitts oscillators and I'd like to Spice some variations. And I'm being lazy. -- John Larkin Highland Technology, Inc lunatic fringe elect...

## Spice Model Problems?

inI'm honing my Spice modeling skills and need some suggestions of devices whose manufacturer-provided Spice model doesn't match reality very...

I'm honing my Spice modeling skills and need some suggestions of devices whose manufacturer-provided Spice model doesn't match reality very well, or has serious issues. I'll try my hand at modeling the device and post my results on these newsgroups and on the LTspice list. It would be helpful if, when you make a suggestion, you state where and how it fails to match up with claimed data sh...

## Spice Model Needed...

inSpice Model Needed... Does anyone know of a _device-level_ Spice model for a 74HC05 open-drain inverter? I could write one, but there's not...

Spice Model Needed... Does anyone know of a _device-level_ Spice model for a 74HC05 open-drain inverter? I could write one, but there's not a lot of accurate specification information out there. I need a device-level model since my client's application dumps a capacitor. ...Jim Thompson -- | James E.Thompson ...

## AD834 Spice Model Updated

inThe Spice Model for the ADI 500MHz Four-Quadrant Multiplier has been updated (AD834_SPICE_Model.zip) on the Device Models & Subcircuits Page of...

The Spice Model for the ADI 500MHz Four-Quadrant Multiplier has been updated (AD834_SPICE_Model.zip) on the Device Models & Subcircuits Page of my Website, adding in the Spice model for RNOISELESS, and also an LTspice schematic symbol. Performance has been verified by Helmut Sennewald. ...Jim Thompson -- | James E.Thompson ...

## Spice Notation Question

inI have a customer using _Microcap_ who claims that this notation.... .PRINT AC DB(V([OUT])/V([IN_AMP])) means print the dB DIFFERENCE...

I have a customer using _Microcap_ who claims that this notation.... .PRINT AC DB(V([OUT])/V([IN_AMP])) means print the dB DIFFERENCE between V(OUT) and V(IN_AMP). I can't find such notation in the reference manual. Can this be correct? (I created a Spice model for the customer. Models runs on all brands of Spice EXCEPT Microcap which gives an "underflow" error.) ...

## LM317 in LT Spice

inSurprisingly, LTC makes an LM317 http://www.linear.com/product/LM317 But LT Spice doesn't seem to have a model. Does anybody have a...

Surprisingly, LTC makes an LM317 http://www.linear.com/product/LM317 But LT Spice doesn't seem to have a model. Does anybody have a working LT Spice sim that includes an LM317? -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digit...

## Spice speed

inI added a *comment* to my LT Spice simulation and it slowed it down about 20:1. -- John Larkin Highland Technology,...

I added a *comment* to my LT Spice simulation and it slowed it down about 20:1. -- John Larkin Highland Technology, Inc lunatic fringe electronics

## XY plots in LT Spice

inI can manually change the x-axis of a transient response graph, from time to some node voltage, by manually right-clicking on the...

I can manually change the x-axis of a transient response graph, from time to some node voltage, by manually right-clicking on the graph x-axis. But that doesn't stick. Is there some spice directive I can put on my schematic to change the plot x-axis? I want to plot diode currents from -0.5 to +0.5 volts. LT Spice is wonderful and its HELP is awful. -- John Larkin H...