Analysis of Nonidealities in Undersampling SAR ADCs

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Journal Title
Journal ISSN
Volume Title
Sähkötekniikan korkeakoulu |
Date
2018-08-20
Department
Major/Subject
Micro- and Nanoelectronic Circuit Design
Mcode
ELEC3036
Degree programme
NanoRad - Master’s Programme in Nano and Radio Sciences
Language
en
Pages
50+35
Series
Abstract
With the foreseeable adaptation of 5 G networks and its increasing use, blockers are becoming more common on their frequency bands. This gives rise to the need of wideband blocker-detection circuits for frequencies up to 6 GHz. The use of under- sampling SAR ADCs to detect blockers has already been demonstrated [1], however the performance showed to be lower than expected. The objective of this work is to investigate nonidealities appearing in SAR ADCs, when used as under-sampling converter. Therefore, a behavioral model of a SAR ADC has been built in Verilog-A, and an accompanying toolchain in Matlab has been devel- oped to assess the impact of system parameter variations on the dynamic performance figures (SNR, SNDR,...). The utilization of a behavioral model also allows an isolated view on otherwise interdependent phenomena, besides reducing the simulation time. System simulations show the effect of various system parameter variations on the converter performance. The conclusions drawn from behavioral simulations have been verified by inserting 65 nm technology transistors into the behavioral model. The sampling error appearing at slow switch transition times has also been investigated. It has been concluded, that the SAR ADC performance is primarily limited by the track-and-hold circuit, as the finite transition time from track- to hold-state causes the fast changing input signal to be averaged nonlinearly, instead of being sampled almost ideally.
Description
Supervisor
Ryynänen, Jussi
Thesis advisor
Unnikrishnan, Vishnu
Keywords
undersampling, sar adc, nonidealities, behavioral modeling, Verilog-A
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