Design and implementation of a FPGA sigma-delta power DAC

Author

Magrath, A.J. ; Clark, I.G. ; Sandler, M.B.

Author_Institution

Dept. of Electron. Eng., King´´s Coll., London, UK

fYear

1997

fDate

3-5 Nov 1997

Firstpage

511

Lastpage

521

Abstract

In this paper we discuss the design and implementation of a FPGA power DAC for digital audio applications. The paper concentrates on the sigma-delta modulator, which is used to convert an oversampled PCM input signal into a 1-bit code suitable for controlling a power switch. The design of the bit-flipping architecture used to reduce the pulse-repetition frequency of the output is discussed, together with the the loop filter structure and transfer function design. This is followed by details of FPGA architecture and the optimisations required for implementation

Keywords

audio signals; digital-analogue conversion; field programmable gate arrays; optimisation; sigma-delta modulation; 1-bit code; FPGA sigma-delta power DAC; bit-flipping architecture; design; digital audio applications; implementation; loop filter structure; modulator; optimisations; oversampled PCM; power switch; pulse-repetition frequency; transfer function design; Analog-digital conversion; Baseband; Delta-sigma modulation; Digital modulation; Field programmable gate arrays; Filters; Frequency conversion; Modulation coding; Quantization; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Systems, 1997. SIPS 97 - Design and Implementation., 1997 IEEE Workshop on

Conference_Location

Leicester

ISSN

1520-6130

Print_ISBN

0-7803-3806-5

Type

conf

DOI

10.1109/SIPS.1997.626339

Filename

626339