Integration of cryocooled superconducting analog-to-digital converter and SiGe output amplifier

HYPRES is developing a prototype digital system comprising a Nb RSFQ analog-to-digital converter (ADC) and SiGe amplifiers on a commercial two-stage cryocooler. This involves the detailed thermal, electrical, and mechanical design of the ADC chip mount, input/output (I/O) cables, and electromagnetic...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2003-06, Vol.13 (2), p.477-483
Main Authors: Gupta, D., Kadin, A.M., Webber, R.J., Rochwarger, I., Bryce, D., Hollander, W.J., Young Uk Yim, Channakeshav, Kraft, R.P., Jin-Woo Kim, McDonald, J.F.
Format: Article
Language:English
Subjects:
Amplifiers
Analog-digital conversion
Applied sciences
Circuit properties
Circuits
Design. Technologies. Operation analysis. Testing
Digital circuits
Digital systems
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Germanium silicon alloys
Heterojunction bipolar transistors
Integrated circuits
Prototypes
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Semiconductors
Signal convertors
Silicon germanium
Superconducting cables
Superconducting device noise
Thermal resistance
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Summary:HYPRES is developing a prototype digital system comprising a Nb RSFQ analog-to-digital converter (ADC) and SiGe amplifiers on a commercial two-stage cryocooler. This involves the detailed thermal, electrical, and mechanical design of the ADC chip mount, input/output (I/O) cables, and electromagnetic shielding. Our objective is to minimize the heat load on the second (4 K) stage of the cryocooler, in order to ensure stable ADC operation. The design incorporates thermal radiation shields and magnetic shielding for the RSFQ circuit. For the I/O cables, the thermal design must be balanced against the acceptable attenuation of RF lines and resistance of DC bias lines. SiGe heterojunction bipolar transistor (HBT) signal conditioning circuits, placed on the first (60 K) stage of the cryocooler, will amplify the mV-level ADC outputs to V-level (e.g., ECL) outputs for seamless transition to room-temperature electronics. Cooling these HBT circuits lowers noise and improves their high-frequency performance. Demonstration of this prototype should lead the way to commercialization of high-speed digital superconducting systems, for such applications as wireless communication, radars, and switching networks.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2003.813911