Design and high-speed testing of a superconducting delta-sigma oversampled converter

Author

Xiao, P.H. ; Hebert, D. ; Whiteley, S.R. ; Van Duzer, T.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2264

Lastpage

2267

Abstract

A delta-sigma modulator with a lowpass filter can achieve the same signal-to-noise ratio (SNR) and dynamic range as a delta-sigma modulator with an integrator by adjusting the cut-off frequency of its lowpass filter. A lowpass filter modulator in superconducting niobium technology was designed and tested up to a 1 GHz sampling rate and was shown to be operating correctly. The bits of a pseudo-random bit stream digital output are acquired individually by a high-speed logic analyzer. The acquired data show 6 bits of modulator dynamic range, which is limited below the simulated value of 11 bits, at least in part, by errors in the test equipment.<>

Keywords

Josephson effect; integrated circuit testing; low-pass filters; sigma-delta modulation; superconducting device testing; superconducting integrated circuits; 1 GHz; delta-sigma converter; high-speed testing; lowpass filter modulator; oversampled converter; pseudo-random bit stream digital output; superconducting ADC; superconducting Nb technology; Cutoff frequency; Delta modulation; Dynamic range; Niobium; Sampling methods; Signal to noise ratio; Superconducting filters; Superconducting logic circuits; Test equipment; Testing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403036

Filename

403036