Discrete Time Sigma Delta ADC

Hello,

In Discrete time Sigma Delta ADC, that is, using switched capacitor techniques, people use a reset switch in parallel with the switch capacitor capacitor, sometimes. This is usually not explained in the text books or papers.

What is the purpose of this reset switch and does anyone have a paper, screen capture or reference material that explains the reset switch concept in Sigma Delta Discrete Time ADC design?

Thank you.

Puppet123 said:

This is usually not explained in the text books or papers.

Click to expand...

Surely read basic documents.
You can see explanation in any basic document.

Puppet123 said:

What is the purpose of this reset switch

Click to expand...

To escape from instability.
This is also true for Continuous-Time DSM-ADC.
Reset switch is connected to integral capacitor.

See Schreier's Green book whicgh is avery fundamentak book in this field.
https://www.amazon.com/gp/reader/0471465852/ref=sib_dp_pt#reader-link

Hello,

Thank you for your reply.

I have read the textbooks commonly known in the Sigma Delta ADC field : yellow book, green book, Gabor Temes books, and others.

Although the Green book, as you attached, explained the concept and theoretical requirements for the reset switch, I have yet to find a paper, thesis or other resource that actually shows or explains the actual implementation of this concept in a converter. This is what I am looking for.

What is the timing of this reset switch as compared to the other clocked elements ? How do I determine the timing ? What is the length of this pulse ? These are the concepts and questions I am looking for answers to.

I find most texts in the field of Sigma Delta ADC to be too mathematical and too "magical" to be of real practical benefit and quite frankly - they are poorly written from an engineer's point of view.

Thank you.