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A Wide-Bandwidth Digital Filterbank

Published online by Cambridge University Press:  12 April 2016

R. S. Foster ,
P. S. Ray ,
S. C. Lundgren ,
D. C. Backer ,
M. R. Dexter  and
A. Zepka
R. S. Foster
Affiliation:
Code 7213, Naval Research Laboratory, Washington, DC 20375
P. S. Ray
Affiliation:
Code 7213, Naval Research Laboratory, Washington, DC 20375
S. C. Lundgren
Affiliation:
Code 7213, Naval Research Laboratory, Washington, DC 20375
D. C. Backer
Affiliation:
Astronomy Department, University of California, Berkeley, CA 94720
M. R. Dexter
Affiliation:
Astronomy Department, University of California, Berkeley, CA 94720
A. Zepka
Affiliation:
Astronomy Department, University of California, Berkeley, CA 94720

Extract

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The Navy/Berkeley Pulsar Processor (NBPP) is a digital filterbank which is based on the successful Digital Filter Boards constructed for the University of California Coherent Dispersion Removal Processor (CDRP). One 9U VME crate holds a complete system with 96 channels × 2 polarizations. Running at maximum speed, the full crate will cover 1.8 MHz/channel = 172 MHz total bandwidth. Narrower bandwidths are available by running the system clock slower. The digitization has 4 bits of precision for good dynamic range and minimal quantization effects. The output data has variable time resolution; typically 50-100 μs for search mode, and 2.4 μs for timing mode. A flexible analog mixer/filter front end provides variable width filters, programmable attenuators, and input power level measurements, along with IF-to-baseband mixing and amplification capability. Data acquisition software running on a Sun Sparcstation-20 is based on software developed for controlling the Penn State Pulsar Machine (PSPM).

Type
Part 1 The Pulsar Population
Information
International Astronomical Union Colloquium , Volume 160: Pulsars: Problems and Progress , 1996 , pp. 25 - 26
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

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