A fast 2-bit digitizer for radio astronomy

The design and performance details for a 2-bit digitizer operating at a 250-MHz clock rate are presented. The digitizer is part of a new correlator system for a three-element millimeter-wave interferometer. The performance of the digitizer circuit is analyzed in terms of threshold errors, indecision...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	IEEE transactions on instrumentation and measurement 1989-12, Vol.38 (6), p.1109-1115
Hauptverfasser:	Padin, S., Ewing, M.S.
Format:	Artikel
Sprache:	eng
Schlagworte:	Apertures Astronomical and space-research instrumentation Astronomy Circuit analysis Clocks Correlators Earth, ocean, space Exact sciences and technology Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations Millimeter wave circuits Performance analysis Radio astronomy Radio interferometry Sampling methods Timing
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The design and performance details for a 2-bit digitizer operating at a 250-MHz clock rate are presented. The digitizer is part of a new correlator system for a three-element millimeter-wave interferometer. The performance of the digitizer circuit is analyzed in terms of threshold errors, indecision, sampling aperture width, and timing errors. For an input bandwidth of 125 MHz, digitizer distortion actually improves the sensitivity of the interferometer by about 0.3% but limits the dynamic range of the instrument to about 2*10/sup 3/.< >
ISSN:	0018-9456 1557-9662
DOI:	10.1109/19.46410