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about ::
Some tests :: Zipped Source
Some more tests ::
PS ! the last figure specifies the INP voltage range ( ! not the the one of the OUTP ! )
. . .
an improved ver. of the above ::
[Eop]
Showing posts with label КР140УД1208. Show all posts
Showing posts with label КР140УД1208. Show all posts
Wednesday, October 7, 2020
Poor Models of some Old Soviet Op-Amps + µA741
[Eop]
Wednesday, January 9, 2019
More ver.α tests
while designing a custom op amp-s , i have noticed there are 2 voltage levels , above what the op amp-s start to show up a better behavior -- namely 6.8V and 9.6V total supply e.g. ±3.4V and ±4.8V below that the things much depend on input signal level and the dc offset . . .
this one gets it's gain up from above ±5.5V , ???
. . .
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this one gets it's gain up from above ±5.5V , ???
. . .
[Eop]
Tuesday, January 8, 2019
(uA776) Fix Summed to ver.α
as is (requires more tests to be verified as success ! -- such as noise/stability . . . )
anyways ::
Random tests ::
src :: a noise amp test turns out to be a resolute op-amp models' quality checker !!!
src :: ADC related Op.-Amp. Experiment
The collector load regulator is another good test to find out some possible stability issues . . .
. . . nothing in particular irregular about this OpAmp ("ver.α Fix") was discovered in the following circuit
[Eop]
anyways ::
Random tests ::
src :: a noise amp test turns out to be a resolute op-amp models' quality checker !!!
src :: ADC related Op.-Amp. Experiment
The collector load regulator is another good test to find out some possible stability issues . . .
. . . nothing in particular irregular about this OpAmp ("ver.α Fix") was discovered in the following circuit
[Eop]
Monday, January 7, 2019
Updated the uA776 component level model
. . . The 3-rd test ::
about CLM-s' differences ::
about Virtual GND - Test ::
After some more tests . . . it turns out the only credible variant is the v.µA
. . . however if i manage to fix the v.1.1 problem it'll be the best . . . if (yay,yay,yay) . . . well if you fix one problem it usually triggers the load of others . . .
[Eop]
about CLM-s' differences ::
about Virtual GND - Test ::
After some more tests . . . it turns out the only credible variant is the v.µA
. . . however if i manage to fix the v.1.1 problem it'll be the best . . . if (yay,yay,yay) . . . well if you fix one problem it usually triggers the load of others . . .
[Eop]
Monday, December 3, 2018
The КР140УД1208 (µA776) variants' Comparison
as by control current range -- i can telll -- i still don't have the Model 4 the Op Amp in question ...
anyway , here's the variations in between what i've come up with ::
↑ and this is better ↑ than nothing -- because it reveals the SR being dependent on the supply voltage and the control current . . . ← but also the Outp.Zero or Balance changes along . . . so the uA776 is a head-ake . . . -- to be set up with the floating supply --and/or-- with the wide-varying signal amplitude/-frequency range
► a small signal pulse response test -- it necessarily won't have the best performer being the best match2® dependency ...
► a small signal sine test -- reveals (as and brought below) the offset and phase/SR differences
-- the unit is -- (µ-"ns") per (µA)² -- the delay is revealed indirect from ::
dt(for 776) = dt(776.Outp , Fn.Gen.Outp) – dt(LT1013.Outp , Fn.Gen.Outp)
near the ~AC.zero --or-- the SG (Signal Ground) , e.g. -- near/@ ±0V in the circuit below
[Eop]
anyway , here's the variations in between what i've come up with ::
↑ and this is better ↑ than nothing -- because it reveals the SR being dependent on the supply voltage and the control current . . . ← but also the Outp.Zero or Balance changes along . . . so the uA776 is a head-ake . . . -- to be set up with the floating supply --and/or-- with the wide-varying signal amplitude/-frequency range
► a small signal pulse response test -- it necessarily won't have the best performer being the best match2® dependency ...
► a small signal sine test -- reveals (as and brought below) the offset and phase/SR differences
-- the unit is -- (µ-"ns") per (µA)² -- the delay is revealed indirect from ::
dt(for 776) = dt(776.Outp , Fn.Gen.Outp) – dt(LT1013.Outp , Fn.Gen.Outp)
near the ~AC.zero --or-- the SG (Signal Ground) , e.g. -- near/@ ±0V in the circuit below
[Eop]
Monday, August 20, 2018
Tuesday, August 7, 2018
µA776/LM4250/LM301 models comparison
differential Sine ::
Note : the max.input voltage range is limited to the half of the half of total supply by common mode variation (e.g. in single sine input the value may be higher !!!)
µA776 against LM4250 differential Pulse ::
К(Р)1407УД2 against LM4250 differential Pulse ::
К(Р)157УД2 against LM301 differential Pulse ::
NB! -- why there is no Spice models to download here is because i'm not the Spice model factory -- i would rather download these from internet - if there were any - 8 billion people - a lot of Spice users . . . no any g.d. models !!!
mine are not that good that you'd know where or whether to use them and how much or when to trust them -- i don't want to populate chaos ... (there likely is an email somewhere and a comment area if you think you need any)
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Note : the max.input voltage range is limited to the half of the half of total supply by common mode variation (e.g. in single sine input the value may be higher !!!)
µA776 against LM4250 differential Pulse ::
К(Р)1407УД2 against LM4250 differential Pulse ::
К(Р)157УД2 against LM301 differential Pulse ::
NB! -- why there is no Spice models to download here is because i'm not the Spice model factory -- i would rather download these from internet - if there were any - 8 billion people - a lot of Spice users . . . no any g.d. models !!!
mine are not that good that you'd know where or whether to use them and how much or when to trust them -- i don't want to populate chaos ... (there likely is an email somewhere and a comment area if you think you need any)
[Eop]