Sunday, September 20, 2020

Virtual eval. of some LoVo OpAmp.-s

 is what the title says :

Text as a text :

note : if there will be no spurious oscillations configuring the LM358 , LM324 as the unity buffer shown at above fig. then the sentence "the transistor model requires a scaled input to prevent the spurious oscillation" has no meaning in real-life otherwise the recommended biasing scheme is as http://tinyurl.com/yyvgyz32


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Saturday, August 8, 2020

CD4013 by state machine

 about

model


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Saturday, June 27, 2020

LM311 & LM393 common mode sensitivity test

LM311 auto-biasing test


LM311 optimal (most sensitive) input voltage offset TEST


LM393 optimal (most sensitive) input voltage offset TEST


LM393 oscillator forcing the input to it's optimal common input voltage offset ... Vee/Vss/-Vs




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Wednesday, April 29, 2020

More experimental spice models


Digital (SN7400 , SN7404 , SN7414 , SN7474 , SN7486 , SN74112)

how and when i use ↑these↑ :: is to determine the apx. dynamic power draw , relative I/O states , etc.

it is not advised to use these in complex digital simulations coz such takes excessive time ... and serves no conceptual purpose


TLC555 (Ti's P-Spice , + a Less simplified , + a More simplified)

since my first Ti's TLC variant model conversion for the LTSpice got destroyed  in OS reinstall - i haven't had time to recreate it . . . so -- the simplified /!\ ideal /!\ models are "close enough" to run a principial simulations -- one must address the shortcomings of such . . . + moreover the ideal models lack some required damping and referencing internal components ← means: the simulation may hang due the shortcomings from such = all pins must be connected or referenced through R or R C networks ← the values of which may be crucial to simulation "stability" (not to hang , etc. ...)


"DIGITAL" PASS GATE (not fully verified but so far a will do v. -- with 2 simulation examples)
(related post : Comparing TTL JK Triggers' Logic Designs)

example use



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Monday, April 27, 2020

Some experimental (mostly CLM) models

Analog ◄ about ::

the models are (behave) sometimes (at some circuits) better than the manufacturer provided ones . . . anyway they are the way slower -- so , using the multiples of them dramatically slows down the simulation . . . /!\  since the op amps basically act all the same  /!\ it is advised to use similar Is , Vs , GBW , SR or better LTSpice's "built in" substitutes in case the simulation speed matters



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