S B Belmonte et al 2003 Meas. Sci. Technol. 14 N1 doi:10.1088/0957-0233/14/1/401
A field-programmable gate-array-based high-resolution pulse programmer
S B Belmonte1, R S Sarthour, I S Oliveira and A P Guimarães
Show affiliationsDESIGN NOTE
In the work described here, a general-purpose pulse programmer (PP), of very low cost and high resolution, was built using a field-programmable gate array (FPGA). This is a novel application for this device. The FPGA is an integrated circuit which can be programmed to perform a specific task. The pulse programmer built has 16 independent output channels, with resolution of 50 ns, which is also the minimum duration of each event. The basic hardware consists of two chips, an FPGA and the memory, in which the configuration file is stored. The event sequence is sent to the PP through the parallel port of a personal computer, which is controlled using the graphical programming language LabVIEW. This PP was designed to be part of a nuclear magnetic resonance (NMR) spectrometer, used in the study of magnetic metals. The frequency spectra of the pulses were obtained and the results compared with simulated calculations. An NMR spectrum of metallic cobalt was taken, and the 59Co resonance was recorded as a function of frequency after a sequence of two excitation pulses. The results showed good agreement between our spectrum and results from the literature.
- PACS
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84.30.Sk Pulse and digital circuits
85.40.-e Microelectronics: LSI, VLSI, ULSI; integrated circuit fabrication technology
- Subjects
- Dates
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Issue 1 (January 2003)
Received 24 September 2002, accepted for publication 18 November 2002
Published 11 December 2002
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A field-programmable gate-array-based high-resolution pulse programmer
S B Belmonte et al 2003 Meas. Sci. Technol. 14 N1
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