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- Analog-to-Digital Converters (ADCs) (1)
- Bandwidth (1)
- Calibration (1)
- Channel fading (1)
- Commercial food crops (1)
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- Communication links (1)
- Error mechanisms (1)
- Intersymbol interference (1)
- Multipath signal reflections (1)
- Multirate filter bank (1)
- Pesticides (1)
- Phosmet (1)
- Pipeline Analog-to-Digital Converters (ADCs) (1)
- Quantizer (1)
- Quartz crystal microbalance (QCM) (1)
- Underwater acoustic modem receiver (1)
- Underwater environments (1)
Articles 1 - 4 of 4
Full-Text Articles in Engineering
Multiband Analog-To-Digital Conversion, Scott Saucier
Multiband Analog-To-Digital Conversion, Scott Saucier
Electronic Theses and Dissertations
The current trend in the world of digital communications is the design of versatile devices that may operate using several different communication standards in order to increase the number of locations for which a particular device may be used. The signal is quantized early on in the reciever path by Analog-to-Digital Converters (ADCs), which allows the rest of the signal processing to be done by low complexity, low power digital circuits. For this reason, it is advantageous to create an architecture that can quantize different bandwidths at different frequencies to suit several different communication protocols. This thesis outlines the design …
Error Compensation In Pipeline And Converters, Kannan Sockalingam
Error Compensation In Pipeline And Converters, Kannan Sockalingam
Electronic Theses and Dissertations
This thesis provides an improved calibration and compensation scheme for pipeline Analog-to-Digital Converters (ADCs). This new scheme utilizes the intermediate stage outputs in a pipeline to characterize error mechanisms in the architecture. The goal of this compensation scheme is to increase the dynamic range of the ADC. The pipeline architecture is described in general, and tailored to the 1.5 bitslstage topology. Dominant error mechanisms are defined and characterized for an arbitrary stage in the pipeline. These error mechanisms are modeled with basis functions. The traditional calibration scheme is modified and used to iteratively calculate the error characteristics. The information from …
Prototype Micro Sensors For The Detection Of Pesticide Residues On Blueberries, Guang Chen
Prototype Micro Sensors For The Detection Of Pesticide Residues On Blueberries, Guang Chen
Electronic Theses and Dissertations
The widespread use of pesticides on commercial food crops can result in short and long term health problems for both f m workers and consumers as well as serious impacts on the environment. Consequently, there is an increasing need to develop low cost portable detection systems that can be used to screen for pesticide residues on food products. Since phosmet (C1 IH12N04PS2) is one of the most commonly used organophosphorous pesticides within the state of Maine, it is selected as the target pesticide to detect in this thesis. Two sensing techniques were investigated. One is the quartz crystal microbalance (QCM), …
Implementation Of An Underwater Digital Acoustic Telemetry Reciever, Raymond A. Mcavoy
Implementation Of An Underwater Digital Acoustic Telemetry Reciever, Raymond A. Mcavoy
Electronic Theses and Dissertations
This thesis presents the design and software implementation of an underwater acoustic modem receiver. Communication links in underwater environments face several undesired effects. These include multipath signal reflections, intersymbol interference, and channel fading. This receiver design uses a combination of time and spatial diversity inputs combined with an adaptive feedback equalizer to counteract those effects. The design is based on three modules. A front-end module demodulates and Doppler-compensates the incoming data. A channel combiner module receives data from one or more front ends for spatial diversity and combines repeated transmissions for time diversity. The data from each input channel is …