Miniature power-efficient time-based differential analog-to-digital converters

Time-Based Analog-to-Digital Converter (ADC), at scaled CMOS technology, plays a major role in designing Software Defined Radio (SDR) receivers as it manifests higher speed and lower power than conventional ADCs. Time-Based ADC includes a Voltage-to-Time Converter (VTC) or a Voltage-Controlled Delay Unit (VCDU) which converts the input voltage into a pulse delay, and a Time-to-Digital Converter (TDC) which converts the pulse delay into a digital word. In this paper, we present two novel differential VTCs fabricated using TSMC 65nm CMOS technology with ideal TDCs and no sample-and-hold circuit producing complete ADCs.
The first proposed ADC is based on the design of a VCDU. This new ADC operates on a higher sampling frequency of 8 Gsample/sec, with a supply voltage of 1-V. It achieves a wider dynamic-range of 560 mV and a 3% linearity error. Simulation results reveal that this design can achieve up to a 9-bit resolution with Effective Number of Bits (ENOB) of 8.9902 bits in an 8-GHz bandwidth and a 0.3918 fJ/conversion FOM. It consumes a 1.594 mW power. The second proposed ADC is based on a new design methodology which reports a wider dynamic range of 1 V and a higher sensitivity of 9.6 рs/mV. This new ADC operates on a 2.5 Gsample/sec sampling frequency with a 3% linearity error and with a supply voltage of 1.2 V. It also achieves a resolution up to 11 bits with ENOB of 10.7228 bits in a 2.5-GHz bandwidth and a 0.03763 fJ/conversion FOM. It consumes a 0.159 mW power.

This article is published in peer review journal and open access journal, International journal of research in engineering and innovation (IJREI) which have a high impact factor journal for more details regarding this article, please go through our journal website.

download PDF

Editor IJREI
IJREI blog is Job Portal which gives information regarding Teaching Jobs, Research Jobs, and Non Teaching jobs from various Private colleges, Deemed Universities, Government Colleges, and Government Aided Colleges of India. For more detail, contact us using the get in touch within contact form.

Related Posts

There is no other posts in this category.

Post a Comment

Subscribe Our Newsletter