I am designing a circuit SAR ADC in ltspice.

I've been facing this error and I've tried many tricks but I can't find the solution.
I assume that the simulator does not find an initial point of operation.
Ιn the circuit use the following components :
1) LF398
2) LM393
3) 74HCT273
4) 74HCT74
5) 74HCT04

Thnks

 

That asc file throws up this error message

and the schematic doesn't include any of the components in post #1.

 

Hi Panos,
Your posted asc file does not have any of these IC's.??
1) LF398
2) LM393
3) 74HCT273
4) 74HCT74
5) 74HCT04

 

Hi Panos,
Using my LF411 model and Pot it runs OK for me.
E

 

I am designing a circuit SAR ADC in ltspice.

I've been facing this error and I've tried many tricks but I can't find the solution.
I assume that the simulator does not find an initial point of operation.
Ιn the circuit use the following components :
1) LF398
2) LM393
3) 74HCT273
4) 74HCT74
5) 74HCT04

Thnks

sorry wrong file....
this is the correct file

 

hi P,
What is this missing part.?
E

 

That asc file throws up this error message
View attachment 293970
and the schematic doesn't include any of the components in post #1.

sorry i attach wrong file .... this is the correct file

 

hi P,
What is this missing part.?
E

LM393 must be there

I find a model LM393A on PSpice and i autogenerated the symbol and its works in ltspice!

 

hi P,
What is this missing part.?
E

 

Hi P,
Ok added the LM393.

Why have the inputs and outputs got the same Label ID code.?
E

 

Hi P,
Ok added the LM393.

Why have the inputs and outputs got the same Label ID code.?
E
View attachment 293978

Is an 8-bit shift register.
To help you understand I need to design this circuit https://hackaday.io/project/181826-homemade-successive-approximation-register-adc/details in LTspice...

 

Hi P,
Ok added the LM393.

Why have the inputs and outputs got the same Label ID code.?
E
View attachment 293978

this is a trick I did to somehow find the initial operating point.. normally it should be DC 5V

 

Hi,
This is what I see when the Tran is modified. Output of the LM393 plotted.
E

 

Hi,
This is what I see when the Tran is modified. Output of the LM393 plotted.
E
View attachment 293981

OOhh!!!!!!!
Thank youu!!!!
Is it easy for you to send me the file please?

 

Hi Panos,
This is my file, you may have to use your LM393 model.
E
Plot of LM393 Neg pin input.

 

Hi Panos,
This is my file, you may have to use your LM393 model.
E
Plot of LM393 Neg pin input.
View attachment 293986

ok its works! thank you again!!!