Different Approaches to Achieve High SNDR in Low Power Sigma Delta ADC
Veerayya Javvaji1, Sarada Musala2
1Veerayya Javvaji, Department of Electronics & Communication Engineering, Vignan’s Foundation for Science & Technology, Vadlamudi (A.P), India.
2Sarada Musala, Department of Electronics & Communication Engineering, Vignan’s Foundation for Science & Technology, Vadlamudi (A.P), India.
Manuscript received on 14 February 2019 | Revised Manuscript received on 05 March 2019 | Manuscript Published on 08 June 2019 | PP: 373-375 | Volume-7 Issue-5S4, February 2019 | Retrieval Number: E10780275S419/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Analog to digital converter is an essential block in any on-chip digital circuit. Out of different ADC’s oversampling ADC’s uses sampling frequency more than the Nyquist rate which eliminates abrupt cutoff in anti-aliasing filter. A sigma-delta ADC is a type of oversampling ADC which uses a noise shaping circuit to achieve high resolution. The performance metrics such as Figure of Merit (FOM), Signal to noise distortion ratio (SNDR), bandwidth, the sampling frequency of sigma-delta ADC are important in the design of ADC. Different approaches to achieve high SNDR are discussed in this paper as SNDR is one of the primary factors of ADC.
Keywords: ADC, SNDR, FOM, Capacitive-Coupled Chopper Instrumentation Amplifier (CCIA).
Scope of the Article: Low-power design