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A NAND Gate Based Standard Cell VCO for Use in Synthesizable ADCs
Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Electrical Engineering, Integrated Circuits and Systems. Linköping University, Faculty of Science & Engineering.
2015 (English)In: 2015 NORDIC CIRCUITS AND SYSTEMS CONFERENCE (NORCAS) - NORCHIP and INTERNATIONAL SYMPOSIUM ON SYSTEM-ON-CHIP (SOC), IEEE , 2015Conference paper (Refereed)
Abstract [en]

Synthesizable all-digital ADCs lead to reduced design cost and design time as well as to low cross-technology porting costs. VCO-based ADC is an attractive candidate for the synthesis of ADCs using standard cells. However, a VCO, which is controlled by an analog input signal, is difficult to implement using standard digital circuits. Supply controlled ring oscillators using static CMOS inverters are used in prior works. In this work, an alternative VCO built using NAND gates is proposed for use in synthesizable converters. The circuit is demonstrated by employing it in an ADC synthesized from an HDL description. Transistor level simulation of the resulting netlist using the Spectre simulator shows that a performance of 10 bit ENOB over a 10 MHz bandwidth can be achieved after digital correction, using the proposed VCO.

Place, publisher, year, edition, pages
IEEE , 2015.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-131245DOI: 10.1109/NORCHIP.2015.7364398ISI: 000380441400045ISBN: 978-1-4673-6576-5OAI: oai:DiVA.org:liu-131245DiVA: diva2:971498
Conference
Nordic Circuits Systems Conference (NORCAS): NORCHIP & International Symposium on System Chip (SoC) 2015
Available from: 2016-09-16 Created: 2016-09-12 Last updated: 2016-09-16

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Unnikrishnan, VishnuVesterbacka, Mark
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