VCO-based ADCs Design Techniques for Communication Systems

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dc.contributor.advisor Patón Álvarez, Susana Medina Huamán, Víctor Manuel 2019-12-17T11:24:01Z 2019-12-17T11:24:01Z 2019 2019-09-20
dc.description.abstract This work presents a novel technique to implement voltage-controlled oscillator based continuous-time Delta-Sigma analog-to-digital converters (VCO-based CT-ΔΣ ADCs) in closed-loop configuration. Over the past years there has been an upward trend in the use of these type of converters for instrumentation, audio and communication applications. The reason is that they are mostly digital and thus benefit from advances in deep-submicron CMOS processes. VCO-based ADCs have been widely studied in a great deal of papers and it is known that one of its main drawbacks is the non-linearity it presents. To overcome this issue, to place the VCO within a closed-loop is usually done to attenuate its input magnitude level. However, to do so it is needed a digital-to-analog converter (DAC) as in a conventional CT-ΔΣ, therefore it is required for the DAC to be simple and it cannot present a high number of elements, being the latter a bottleneck for implementing VCOs with a high number of inverters. This works presents a technique that enables to use VCOs with severals inverters while keeping the same number of DAC elements as before. Based upon previous theoretical studies of the VCO-based ADCs which model it as a pulse frequency modulation encoder, this new technique is analyzed and linear models are developed in order to study its viability at system level. Moreover, how impairments related to a real implementation affect the use of this technique are also analyzed. The contributions proposed in this document are focused but not limited to communication applications.
dc.format.extent 80
dc.language.iso eng
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.subject.other Delta-Sigma
dc.subject.other Voltage-Controlled Oscillator
dc.subject.other Analog-to-Digital conversion
dc.subject.other VCO-based ADC
dc.title VCO-based ADCs Design Techniques for Communication Systems
dc.type masterThesis
dc.subject.eciencia Electrónica
dc.rights.accessRights openAccess Máster Universitario en Ingeniería de Sistemas Electrónicos y Aplicaciones. Curso 2018/2019
dc.contributor.departamento Universidad Carlos III de Madrid. Departamento de Tecnología Electrónica
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