## Forums Search for: Spice

## Power MOSFET SPICE modelling

inHow can they SPICE model two distinct serially connected resistors (Rls, Rcs - respectively Rll, Rcl) inside a power MOSFET? Are they kidding us...

How can they SPICE model two distinct serially connected resistors (Rls, Rcs - respectively Rll, Rcl) inside a power MOSFET? Are they kidding us ;-) If so is that useful in the model?: A Low-Cost Class-E Power Ampli?er with Sine-Wave Drive - Caltech: http://www.its.caltech.edu/~mmic/reshpubindex/papers/ClassE.pdf (pdf-page 3) - Is it possible (how?) to measure the internal paras

## SPICE microstrip dipole antenna model

inI am experimenting with SPICE microstrip dipole antenna models. The series RLC lumped element model is assumed. For a half-wavelength microstrip...

I am experimenting with SPICE microstrip dipole antenna models. The series RLC lumped element model is assumed. For a half-wavelength microstrip dipole antenna, the inductance value of the two microstrip segments is computed using values for trace width, thickness, substrate thickness and effective dielectric constant. The capacitor value is obtained by using resonant frequency

## LT Spice, ringing LC

inThis is fun. The LC should ring at 1 Hz, but in the default Spice sim, it's low by about 1800 PPM. You have to crank the time step down to...

This is fun. The LC should ring at 1 Hz, but in the default Spice sim, it's low by about 1800 PPM. You have to crank the time step down to 10 us to get the error down below 10 PPM, and the sim gets really slow. Which illustrates the futility of trying to do accurate sims of high-Q circuits in the time domain. Version 4 SHEET 1 880 680 WIRE 224 -192 64 -192 WIRE 416 -192 224 -192 ...

## Interesting First Cut at Spice Modeling of TLP191B

inInteresting First Cut at Spice Modeling of TLP191B... ...Jim Thompson -- | James...

Interesting First Cut at Spice Modeling of TLP191B... ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San T

## SPICE tarnsient analysis of oscillators - sampling time

inCould some electronics guru here please clarify this a bit ? I am experimenting with SPICE transient analysis of oscillator, and I am unsure as...

Could some electronics guru here please clarify this a bit ? I am experimenting with SPICE transient analysis of oscillator, and I am unsure as to what to set as the ideal sampling time, given that most oscillators will generate a fundamental and a few harmonics. For example, suppose that I have a 500 MHz differential oscillator, and I set the sampling time as 1/(15.0*time period of fund...

## cleanup batch file for LT Spice

inThis is _Cleanup.bat rem LT Spice cleanup batch file DEL *.log DEL *.raw DEL *.op.raw -- John Larkin, President ...

This is _Cleanup.bat rem LT Spice cleanup batch file DEL *.log DEL *.raw DEL *.op.raw -- John Larkin, President Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic ...

## SPICE S parameter for frequency dependent circuit components question

inCould some electronics suru here clarify this a bit ? A planar inductor has a frequency dependent resistance(skin, proximity effecrs). Can the...

Could some electronics suru here clarify this a bit ? A planar inductor has a frequency dependent resistance(skin, proximity effecrs). Can the small signal S parameters for such an inductor be measured using stabdard SPICE small signal(.AC) analysis ? At each frequency in a specified frequency range, the series resistance is different. Does this new resistance at each frequency have effect on ...

## Spice Model for ADI 500MHz Four-Quadrant Multiplier Added to my Website

inA Spice Model for the ADI 500MHz Four-Quadrant Multiplier has been added (AD834_SPICE_Model.zip) to the Device Models & Subcircuits Page of my...

A Spice Model for the ADI 500MHz Four-Quadrant Multiplier has been added (AD834_SPICE_Model.zip) to the Device Models & Subcircuits Page of my Website, with... * Improper modeling syntax corrected by Jim Thompson on 2015_01_16: * * " ...subcircuit definitions cannot * be nested. That is, a .SUBCKT statement cannot appear in the * statements between a .SUBCKT and a .ENDS." * * Also fixed...

## How measure differential current in SPICE ?

inCould some SPICE guru please help ? I use HSPICE and Ngspice, both text input based. I wish to measure differential current output from a...

Could some SPICE guru please help ? I use HSPICE and Ngspice, both text input based. I wish to measure differential current output from a test circuit. For each output node, I can add a zero voltage output voltage source as for example VTST 3 4 DC 0.0 AC 0.0 And then measure the current at each output node as .TRAN PRINT I(VTST1) ; and so on But how do I combine the output from ...

## AN: New Spice Model Posted to my Website... MC33161 Universal Voltage Monitor

New Spice Model Posted to my Website: See MC33161_JT.zip (Universal Voltage Monitor) on the Device Models & Subcircuits Page of my website. ...

New Spice Model Posted to my Website: See MC33161_JT.zip (Universal Voltage Monitor) on the Device Models & Subcircuits Page of my website. (Also see DigitalPrimitives.zip for the digital details.) This is a SWAG based ONLY on the datasheet. Please direct all questions/comments/error-reporting via my website or via the LTspice List... S.E.D is no longer suitable for technical discuss...

## Comparators in Spice

inI just cannot get any comparator to behave sensibly in Spice. For example, with the following, the output stays high regardless of the inputs....

I just cannot get any comparator to behave sensibly in Spice. For example, with the following, the output stays high regardless of the inputs. As configured, as far as I can see, the output should be negative, or zero, not high. Am I having a senior moment? Sylvia. Version 4 SHEET 1 880 680 WIRE 304 32 -64 32 WIRE 336 32 304 32 WIRE 304 128 304 32 WIRE 336 128 336 32 WIRE 28...

## AN: Basic OpAmp Output Stage Spice Model Posted to my Website

inBasic OpAmp Output Stage Spice Model... Passes load current to proper Voltage Rail... No Voltage Bounds, No Current Limit, Yet ;-) See... ...

Basic OpAmp Output Stage Spice Model... Passes load current to proper Voltage Rail... No Voltage Bounds, No Current Limit, Yet ;-) See... BasicOpAmpOutputStage.png on the Device Models & Subcircuits Page of my website. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations ...

## Defect in Analog Devices Spice model for the AD734

inI've been using the Analog Devices Spice model in LTSpice to model the AD734 running with a current output - see Figure 25 on page 13 of the Rev...

I've been using the Analog Devices Spice model in LTSpice to model the AD734 running with a current output - see Figure 25 on page 13 of the Rev E AD734 data sheet http://www.analog.com/media/en/technical-documentation/data-sheets/AD734.pdf When running a roughly 15kHz sine wave through the device, the positive current output limits at something between +200uA and +280uA. The

## Log sweeping a current with SPICE.

inI haven't found a SPICE that allows for Log sweeping. To make wide-range BJT beta-vs-IC and Gummel plots, I did the following: 1. DC sweep...

I haven't found a SPICE that allows for Log sweeping. To make wide-range BJT beta-vs-IC and Gummel plots, I did the following: 1. DC sweep with equal voltage steps, e.g. 0 to 20 volts, 0.2-volt steps. 2. Linear EXP function subcircuit. 3. Voltage-controlled current source, with severe attenuation, 1E-10 * At this point we have a super-wide-range log sweep of base current. 4. Smal...

## Colpitts kick-start in LT Spice

inThe 100-second interval, before the kick-start, does all sorts if fun stuff, but doesn't seem to want to oscillate. It's super sensitive...

The 100-second interval, before the kick-start, does all sorts if fun stuff, but doesn't seem to want to oscillate. It's super sensitive to time step and Spice params. https://www.dropbox.com/s/03mhw5qrkg66v88/CPKS_1.jpg?dl=0 https://www.dropbox.com/s/h6nm3g6rro8ioj7/CPKS_2.jpg?dl=0 https://www.dropbox.com/s/wqnh5de42kpqv38/CPKS_3.jpg?dl=0 https://www.dropbox.com/s/xo6elrlhzvu6mh...

## Announcement: Spice Models for TC4421/TC4422 posted on my website...

inAnnouncement: Spice Models for TC4421/TC4422 posted on my website... See TC4421-TC4422.zip on the Device Models & Subcircuits Page of...

Announcement: Spice Models for TC4421/TC4422 posted on my website... See TC4421-TC4422.zip on the Device Models & Subcircuits Page of my website. This behavioral modeling post is for announcement purposes only. To submit questions or comments, or to request assistance, please use the envelope icon (at top of my home page). To avoid spam filtering, follow the instructions carefully. ...

## IGBT in Linear Mode

inAny good articles in using IGBTs in linear mode? With all due respect for the uselessness of SPICE when you can't do the work on paper --...

Any good articles in using IGBTs in linear mode? With all due respect for the uselessness of SPICE when you can't do the work on paper -- does anyone know how good a SPICE model designed for an IGBT in switched service might work in linear mode? Who tends to have better models for linear service? Whether anyone has models specifically for IGBTs in linear mode? TIA -- IGBTs seem to ...

## Measure input/output impedance with Spice

inCould some electronics/Spice guru shed some light on this. Suppose I want to measure the input impedance of a test circuit. The impedance...

Could some electronics/Spice guru shed some light on this. Suppose I want to measure the input impedance of a test circuit. The impedance can be AC or DC. Let us consider DC. I set up the following circuit, with a DC voltage source, connected with a voltage source with zero DC and AC output, followed by the circuit under test. I sweep the DC voltage of the first DC voltage source....

## How do I do combined verilog and spice simulations?

inHas anybody tried this? preferrably using something free(ngspice?)...

Has anybody tried this? preferrably using something free(ngspice?)...