19 July 2016 The initial characterization of a revised 10-Gsps analog-to-digital converter board for radio telescopes
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Abstract
In this study, the design of a 4 bit, 10-gigasamples-per-second analog-to-digital converter (ADC) printed circuit board assembly (PCBA) was revised, manufactured, and tested. It is used for digitizing radio telescopes. An Adsantec ANST7120-KMA flash ADC chip was used, as in the original design. Associated with the field-programmable gate array platform developed by the Collaboration for Astronomy Signal Processing and Electronics Research community, the developed PCBA provides data acquisition systems with a wider bandwidth and simplifies the intermediate frequency section. The current version of the PCBA exhibits an analog bandwidth of up to 10 GHz (3 dB loss), and the chip exhibits an analog bandwidth of up to 18 GHz. This facilitates second and third Nyquist sampling. The following worstcase performance parameters were obtained from the revised PCBA at over 5 GHz: spurious-free dynamic range of 12 dB, signal-to-noise and distortion ratio of 2 dB, and effective number of bits of 0.7. The design bugs in the ADC chip caused the poor performance. The vendor created a new batch run and confirmed that the ADC chips of the new batch will meet the specifications addressed in its data sheet.
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Homin Jiango, Homin Jiango, Howard Liuo, Howard Liuo, Kim Guzzino, Kim Guzzino, "The initial characterization of a revised 10-Gsps analog-to-digital converter board for radio telescopes", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99143A (19 July 2016); doi: 10.1117/12.2231265; https://doi.org/10.1117/12.2231265
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