Title :
A fast 2-bit digitizer for radio astronomy
Author :
Padin, Stephen ; Ewing, Martin S.
Author_Institution :
Owens Valley Radio Obs., California Inst. of Technol., Pasadena, CA, USA
fDate :
12/1/1989 12:00:00 AM
Abstract :
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 2×103
Keywords :
analogue-digital conversion; astronomical instruments; correlation methods; measurement errors; microwave devices; radioastronomical techniques; radiotelescopes; radiowave interferometers; radiowave interferometry; 125 MHz; 2-bit digitizer; 250 MHz; EHF; Owens Valley interferometer; VHF; correlator system; dynamic range; indecision; input bandwidth; interferometer sensitivity; radio astronomy; sampling aperture width; three-element millimeter-wave interferometer; threshold errors; timing errors; Apertures; Circuit analysis; Clocks; Correlators; Millimeter wave circuits; Performance analysis; Radio astronomy; Radio interferometry; Sampling methods; Timing;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
Conference_Location :
12/1/1989 12:00:00 AM
