High-speed digitizer/averager data-acquisition system for fourier transform electron paramagnetic resonance spectroscopy

Pohida, Thomas J. ; Fredrickson, Hal A. ; Tschudin, Rolf G. ; Fessler, Joseph F. ; Krishna, Murali C. ; Bourg, John ; Harrington, Frank ; Subramanian, Sankaran (1994) High-speed digitizer/averager data-acquisition system for fourier transform electron paramagnetic resonance spectroscopy Review of Scientific Instruments, 65 (8). pp. 2500-2504. ISSN 0034-6748

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Official URL: http://rsi.aip.org/resource/1/rsinak/v65/i8/p2500_...

Related URL: http://dx.doi.org/10.1063/1.1145223

Abstract

A high-speed digitizer/averager data-acquisition system designed and built as part of a 300-MHz Fourier transform electron paramagnetic resonance spectrometer is described. There are two key features of the system: (1) the maximum digitizing rate is 300 Msamples/s and (2) a 256-point free-induction-decay signal running summation can be updated in less than 3 μ s. At the maximum digitizing rate, the system can sum 65 536 FIDs in 220 ms. The system consists of an analog-to-digital converter/adder unit (ADCA) and an IBM compatible personal computer. The ADCA is comprised of a digitizer, high-speed sample buffers, high-speed adders/memory, and control hardware. Design techniques, such as parallel processing, utilized to meet the high-speed performance requirements are described. Trigger and timing signals for the system are derived from the spectrometer. System efficiency, synchronization, and time base stability are demonstrated in the spectrometer at a sampling frequency of 200 MHz. Signa-to-noise ratio enhancements are shown using a lithium phthalocyanine test sample.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Data Acquisition Systems; Digitizers; Signal-to-noise Ratio; EPR Spectrometers; Parallel Processing; Efficiency; Synchronization; Fourier Transformation; Design
ID Code:51952
Deposited On:01 Aug 2011 07:30
Last Modified:01 Aug 2011 07:30

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