Showing posts with label LT1122. Show all posts
Showing posts with label LT1122. Show all posts

Thursday, November 16, 2017

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 ...



[Eop]

Sunday, February 5, 2017

Saturday, February 20, 2016

OpAmp (virtual) Testing ②


UPDATE :: ... @ https://chpsndtch.blogspot.com/2020/11/revised-my-lm321358324-transitor-models.html
Quick eval. ::
LT1012A
It's either really embarrassing  or super funny that all those macro models use the 1 and the very same input stage (see V4 , oo , vG - values)

it reminds me the university times where 90% of our course copied their essays from higher courser´s -- guess it's a good custom . . . muhahaa

the LT1012 seems to have smth. @ 60kHz ??
LT1122
seems nice ?
LM324.cir
LM324G.asc
. . . it seems that the 2N5087 , 2N5089 are too good to be used here . . .

94.5dB voltage gain @ 1kHz
LM324H.asc
(same as prev.)

79.6dB voltage gain @ 1kHz

perhaps describes the LM324 in certain situations ?
LM324J.asc
(same as pre-prev.)

[Eop]

Friday, February 19, 2016

OpAmp (virtual) Testing LM324 LT1012 LT1122

it looks like the LT1122 goes better for Amplifier-X testing than my prev. preference '1012
and here if why ::
LT1012LT1122





no much difference until here
"we" had to compensate the .CiR model ('s why i preffer the macro 1-s)

! The LT1122 can still handle the mess ?
(supposedly thanks to "fast output settling"? and/or 14x higher band with)

many attempts to reduce output offset (to Zero adj. the Amp.) - or - what was tested ::




the 1-st modification - G ( IS = 3.66mA )

the 2-nd modification - H ( IS= 813µA )

the 3-rd modification - J ( IS = 3.66mA )

onsemi source ( IS = 1.2(3) mA : VS = ±2.5(±15) V : RL = ∞ )

update 2017-09-19
verifying LM324 CLM-s´ variants ....


.... so the operation of G and J ver.-s is somewhat predictable.


[Eop]