Design of 3rd order cascaded multi-bit sigma delta modulator for ADC using internal feedback
by Ms Sonika; D.D. Neema; R.N. Patel
International Journal of Mobile Network Design and Innovation (IJMNDI), Vol. 7, No. 1, 2017

Abstract: This paper presents a new design of third order cascaded multi-bit sigma delta modulator for analogue to digital converter. The proposed modulator is based on the conventional multibit cascaded sigma delta modulator with interstage feedback topology. Sigma delta systems favours a cascaded multi-bit architecture for higher resolution and wider bandwidth with extra effort focusing on suppressing the analogue nonlinearity. One of the major analogue non-idealities in a multi-bit cascaded sigma delta modulator is the DAC nonlinearity errors and one of the drawbacks is that performance will be limited by un-cancelled noise introducing from the nonlinear errors of multi-bit DAC. The idea of proposed architecture is to create extra feedback paths around the modulator to reduce the DAC error. In this paper, an improved version of cascaded multi-bit sigma delta modulator is proposed to overcome these problems. In addition, a third order cascaded low distortion ADC architecture is also proposed. Simulation results verify the superiority of both the proposed modulators.

Online publication date: Wed, 08-Mar-2017

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Mobile Network Design and Innovation (IJMNDI):
Login with your Inderscience username and password:

    Username:        Password:         

Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email