Simple Sigma Delta Analog to digital converter

Thread Starter

Raj_Singh

Joined Nov 26, 2023
31
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!

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crutschow

Joined Mar 14, 2008
34,044
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.
 
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Thread Starter

Raj_Singh

Joined Nov 26, 2023
31
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
 

Thread Starter

Raj_Singh

Joined Nov 26, 2023
31
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.

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