Segmented correlation measurements on superconducting bandpass delta-sigma modulator with and without input tone

被引:0
作者
Bulzacchelli, JF
Lee, HS
Hong, MY
Misewich, JA
Ketchen, MB
机构
[1] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
[2] Motorola Inc, Semicond Prod Sector, Tempe, AZ 85284 USA
[3] IBM Corp, Div Res, TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA
关键词
D O I
10.1088/0953-2048/16/12/017
中图分类号
O59 [应用物理学];
学科分类号
摘要
Segmented correlation is a useful technique for testing a superconducting analogue-to-digital converter, as it allows the output spectrum to be estimated with fine frequency resolution even when data record lengths are limited by small on-chip acquisition memories. Previously, we presented segmented correlation measurements on a superconducting bandpass delta-sigma modulator sampling at 40.2 GHz under idle channel (no input) conditions. This paper compares the modulator output spectra measured by segmented correlation with and without an input tone. Important practical considerations of calculating segmented correlations are discussed in detail. Resolution enhancement by segmented correlation does reduce the spectral width of the input tone in the desired manner, but the signal power due to the input increases the variance of the spectral estimate near the input frequency, hindering accurate calculation of the in-band noise. This increased variance, which is predicted by theory, must be considered carefully in the application of segmented correlation. Methods for obtaining more accurate estimates of the quantization noise spectrum which are closer to those measured with no input are described.
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页码:1399 / 1403
页数:5
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