Domanska, Anna

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Assessment of the uncertainty associated with synchronization error in analog to digital conversion with dither and CAV

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17th TC-4 Workshop IWADC on ADC and DAC Modeling and TestingJuly 18th and 19th 2013   Barcelona 73  Assessment of the uncertainty associated with synchronization error in analog to digital conversion with dither and CAV  Ultrapure sinewave generation by combining Josephson systemsAnna Domanska174Ralf Behr175, Oliver Kieler175, Detlef Schleußner175, Luis Palafox175, Franz Ahlers175This article applies to assess the impact of imperfect synchro-nization on signal value as a result of the digital coherent aver-aging used after a-d conversion with dither signal. A variance value of signal samples due to a synchronization error was determined. By a non-zero synchronization error, coherent av-eraging reducing additive noise causes distortions of values of the signal who results from averaging and increasing the value of the conversion a-d result’s uncertainty. The combination of systems exploiting binary-divided and pulse-driven Josephson arrays allows the generation of sin-ewaves with amplitudes of up to 10 V and very low harmonic distortion (-122 dBc). We present results from the combination of a 1 V binary divided Josephson array employed as a mul-tilevel digital to analogue converter and a pulse driven array that is programmed to cancel the harmonic content present in the stepwise approximated output of the binary array. The synthesized waveform can be locked to a timing reference for ultimate frequency stability. The quantum nature of the Josephson synthesizers guarantees the stability of the am-plitude. The unprecedented amplitudes available with this spectral purity open new possibilities for testing of electronic modules and analogue to digital converters.Variance of CAV result for different numbers of averaged repetition: a) M = 10, b) M = 1000 Schematic diagram for the combination of the PJVS and the JAWS.25TS01025TS050

Assessment of the uncertainty associated with synchronization error in analog to digital conversion with dither and CAV

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