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Implementation of a Low-Cost Analog-to-Digital Converter for Audio Applications Using an FPGA
Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim of this master’s thesis is to implement an ADC (Analog-to-Digital Converter) foraudio applications using external components together with an FPGA (Field-ProgrammableGate Array). The focus is on making the ADC low-cost and it is desirable to achieve 16-bitresolution at 48 KS/s. Since large FPGA’s have numerous I/O-pins, there are usually someunused pins and logic available in the FPGA that can be used for other purposes. This istaken advantage of, to make the ADC as low-cost as possible.This thesis presents two solutions: (1) a - (Sigma-Delta) converter with a first order passive loop-filter and (2) a - converter with a second order active loop-filter. The solutionshave been designed on a PCB (Printed Curcuit Board) with a Xilinx Spartan-6 FPGA. Bothsolutions take advantage of the LVDS (Low-Voltage-Differential-Signaling) input buffers inthe FPGA.(1) achieves a peak SNDR (Signal-to-noise-and-distortion-ratio) of 62.3 dB (ENOB (Effectivenumber of bits) 10.06 bits) and (2) achieves a peak SNDR of 80.3 dB (ENOB 13.04). (1) isvery low-cost ($0.06) but is not suitable for high-precision audio applications. (2) costs $0.53for mono audio and $0.71 for stereo audio and is comparable with the solution used today:an external ADC (PCM1807).

Place, publisher, year, edition, pages
2013. , 68 p.
Keyword [en]
ADC, Sigma-Delta, FPGA, LVDS
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:liu:diva-96009ISRN: LiTH-ISY-EX--13/4711--SEOAI: diva2:650302
External cooperation
Actiwave AB
Subject / course
Electronics Systems
Available from: 2013-09-23 Created: 2013-08-12 Last updated: 2013-09-24Bibliographically approved

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