Design of a fast digital double relaxation oscillation SQUID

Author

Podt, M. ; Mieog, A.J. ; Flokstra, J. ; Rogalla, H.

Author_Institution

Dept. of Appl. Phys., Twente Univ., Enschede, Netherlands

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1235

Lastpage

1238

Abstract

A fast digital Double Relaxation Oscillation SQUID (DROS) with a relaxation oscillation frequency of 100 MHz has been developed. The digital DROS incorporates a DROS and a superconducting up-down counter that supplies the feedback flux. The major advantage of a DROS is that the relaxation oscillations generate an on-chip clock signal and therefore, no external clock is required. In order to maximize the slew rate without compromising the sensitivity, the quantization unit of the feedback flux was adapted to the flux noise of the DROS. This resulted in a designed flux slew rate of 5·10⁶ Φ₀/s. We will discuss the design optimization, numerical simulations, the layout and some experimental results of the digital DROS

Keywords

SQUIDs; digital integrated circuits; digital readout; feedback oscillators; high-speed integrated circuits; integrated circuit layout; integrated circuit noise; nuclear electronics; relaxation oscillators; superconducting device noise; superconducting integrated circuits; cryogenic particle detector readout; design optimization; fast digital double relaxation oscillation SQUID design; feedback flux; flux noise; numerical simulations; on-chip clock signal; quantization unit; relaxation oscillation frequency; sensitivity; slew rate; superconducting up-down counter; Clocks; Counting circuits; Design optimization; Feedback; Frequency; Numerical simulation; Quantization; SQUIDs; Signal generators; Superconducting device noise;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919573

Filename

919573