A high-speed 4-Gsample/s 2-bit ADC system for radio astronomy.

Details A high-speed 4-Gsample/s 2-bit ADC system for radio astronomy. A high-speed 4-Gsample/s 2-bit ADC system for radio astronomy.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jelco..79...92m&link_type=abstract

Electron. Commun. Jpn. 2, Electron., Vol. 79, No. 3, p. 92 - 100

Astronomy and Astrophysics

Astronomy

Radio Astronomy: Auxiliary Instrumentation

Scientific paper

To enable VLBI devices to pick out very small variations, it is desirable to increase the sensitivity of detection of the VLBI. For observing quasars, it is beneficial to increase the observation bandwidth and improve the sensitivity of detection. However, for such wide bandwidth systems, gigahertz-order sampling high-speed A/D converters are necessary and the technology for achieving these devices is not yet developed. In this work, the aurhors developed, using Si-bipolar LSI processes (SST-1B), a 4-Gsample/s 2-bit ADC LSI and created a high-speed ADC system. They evaluated the loss in this system due to phase stability, sampling jitter, and the uncertainty region of the comparator of the LSI to evaluate the coherence of the VLBI. They used a frequency transformer device and a picosecond phase comparator as the measurement device for measuring the phase stability of the gigahertz-order ADC system. From the measurement results, they determined that the Allen standard deviation over 1-s of integration time was 3.6×10-13, the sampling jitter was 13.4 ps, and the comparator uncertainty was 20 mV. For a wide bandwidth burst mode VLBI observation system with an observation frequency of 230 GHz, a coherence loss of 7.6 percent was observed. The authors then demonstrated the operation of the ADC system by detecting real radio astronomical observation spectra using this device.

Affiliated with

Also associated with

No associations

Rating

A high-speed 4-Gsample/s 2-bit ADC system for radio astronomy. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A high-speed 4-Gsample/s 2-bit ADC system for radio astronomy., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A high-speed 4-Gsample/s 2-bit ADC system for radio astronomy. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1610606