I am trying to build a Sigma delta ADC and my circuit diagram is attached but I am getting some kind of inverted waveform. Can anyone help me to figure out where am I going wrong. I have given an AC sine between 0 to 5 V. The first graph is the output (g) and the second one is the output on the integrator.
Thanks!

 

I have given an AC sine between 0 to 5 V.

Hi Raj,
Your sine wave is swinging from -5v through +5v , it is not 0v to +5V
E

 

Hi Raj,
Your sine wave is swinging from -5v through +5v , it is not 0v to +5V
E

I have given 0 to 5 V but I am getting a swing from -5 to 5....is there any other way to test my circuit

 

Hi Raj,
Check out this PDF.
E

 

Hi Raj,
Check out this PDF.
E

I do not want to build a quiet complex one but at first a simple one

 

I have given 0 to 5 V but I am getting a swing from -5 to 5....is there any other way to test my circuit

Given where?
In Spice you can generate a 2.5Vpk sinewave with a +2.5V DC offset which provides a 0 to 5V peak sinewave.

 

Given where?
In Spice you can generate a 2.5Vpk sinewave with a +2.5V DC offset which provides a 0 to 5V peak sinewave.

It is the AC signal
It is a spice code
*Sin Wave
vin nin 0 sin (0 5 100 0 0)

 

Can anyone let me know why my output wave is elevated

 

It is a spice code

What Spice are you using?
The AC definition should like like this:
SINE(2.5 2.5 100 0 0)

Can anyone let me know why my output wave is elevated

Post the Spice circuit schematic.

 

What Spice are you using?
The AC definition should like like this:
SINE(2.5 2.5 100 0 0)
Post the Spice circuit schematic.

I am using AIMspice where the code is written...I don't draw the schematic like LTspice. The opamp is a very basic 5 transistor opamp

 

Hello All,

I would like to know if the ADC is stable, or working based on the output waveform or do any of you have any suggestions to make it work more flawlessly.

 

I don't draw the schematic like LTspice.

Then post the schematic you used to generate the Spice file.
Schematics are the language of electronics.

 

Then post the schematic you used to generate the Spice file.
Schematics are the language of electronics.

this is my schematic and in the above post that is my output

 

How do I know how many bit ADC it is based on the waveform

 

Hi Raj,
If you want to see what a Sigma Delta waveform looks like, check this link.
Download that txt file and rename as .asc and run it in LTSpice.
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https://electronics.stackexchange.c...mulate-sigma-delta-adc-pulse-train-in-ltspice

This is what I get when I run that downloaded asc file.

 

hi Raj,
Check out this link.
E
https://www.analog.com/en/design-center/interactive-design-tools/sigma-delta-adc-tutorial.html

also this design PDF