LM393 CLM TEST

LM393 speed test with a dynamic output voltage divider -- gives a best high speed sense range for the 5V supply

the divider (conditionally --and/or-- very approximately ) corresponds to about a single 3.6kΩ pullup resistor (or speculatively to about 1mA max. sink current at high frequency = (5 - 1.4)·1V/3.6kΩ)

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An experimental javaScript Output Voltage Divider Calculator

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Voltage Divider - Calculator

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The Browser Detected ...
window.top.navigator.appName :
window.top.navigator.appCodeName :
window.top.navigator.platform :
window.top.navigator.product :
window.top.navigator.appVersion :
window.top.navigator.userAgent :
window.top.navigator.userAgent (about guessing the Browser) :
V_CC :
U_HI :
U_LO :
I_SNK :
Integrity of the entered data :
R₁ :
R₂ :
R₃ :
R₀ : -- R0 = R1||R3

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Usage :: R1 to R3 correspond to {r1} to {r3} on the Fig. above

 

See also : the formulas for the Voltage comparator's resistive output delimitter

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Summing it up ::

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[Eop]

Testing couple of rectifier circuits from datasheets

The following schematics are from LT1122 and LTC1047 d/s-s
while the first performs more than good -- then on a contrary i had to modify the 2-nd

↓Src::LT1122 datasheet -- not tested at various frequencies nor input amplitudes/wave-forms
 

↓Src::LTC1047 datasheet -- the 10kHz seems to be the limit for the outp integrity here

//// recently i noticed something while using a variant of the ideal diode circuit as shown in the "Low Voltage Op-Amps -- in-simulation TEST" -- so i am about to test through all "Absolute circuits" for their particular peculiarities . . .

↓Src::NE5535 datasheet

↓Src::http://nptel.ac.in/courses/117107094/17

↓Src::https://www.planetanalog.com/author.asp?section_id=3065&doc_id=562650 -- the circuit can do just at about 200kHz !? //// note :: i forgot to change the counter-weight 1N4148-s to 1N34-s below (their effect is not studied here , purpose = pending -- what seems obvious is not always that -- it must be verified whether there should be counter-balance for rectifying diodes or not . . .)

↓Src::https://forum.allaboutcircuits.com/threads/a-full-wave-precision-rectifier-query.9821/ --

↓Src::http://sound.whsites.net/appnotes/an001.htm -- it can go up to the limits defined by the frequency & slew of the Op Amp in use ((!? amazing circuit ?!))

↓Src::http://www.learningelectronics.net/worksheets/opamp8.html --the ® had a "bug" so i made random guesses . . . came out as good as previous ((at least what it seems so far ?)) /// edit : the R9 should be Rcp (although there seems no significant current to/from GND from/to U2.non-inverting_input) /// the input signal amplitude range is ±1.8V @ ±5V supply and ±10V @ ±15V supply -- simplified to a line equation y = ax + b where a = 1.219512195 , b = 2.804878049 , y = VsupTOT/2 , x= abs(±VmaxINP) referenced to the GND ( = Vsup "median" )

updates 'll follow ...

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[Eop]

LMxx39 Circus + 750ns & - 900ns Zero Cross

Circus

Ti provided Pspice thingy for LM339 (is annoyingly ▲impractical▲) + (some of the chip names might be erroneous) -- anyway a good question here is why that cfg. doesn't generate "timestep too small" error . . .

Ti LM339 behavioural model as the bottom plot -- interestingly -- the closest match to prev. does not appear to be the right transistor circuit - the LM239 - but instead my experimental design as LMx39 (respectively LM293 and LMx93 in simulation circuit - both are the component level models e.g. the sub circuits) . . .


Cross the Zero +700ns

making the src. (whitch is yet another variant of the Lim.- or the Window comparator) more practical

Cross the Zero -900ns

using the "slope detector" - the right - first occurring comp.-pair signal can be passed to outp (removes the "echo")

[Eop]