Superconducting IF biasing circuit for low-noise cryogenic applications
Paper in proceedings, 2010

A planar superconducting circuit designed for use in low-noise cryogenic applications is presented. The circuit is a bias-T combined with a 4–8 GHz impedance matching circuitry, which employs entirely planar design with a novel layout. The proposed and tested circuitry is intended to be used with a SIS mixer and incorporates a double section transformer based on microstrip line technology with a total impedance transformation of 5:1 within the frequency band. One of the transformer sections employs a three-line coupled line, which also serves as a DC block capacitor. The microstrip lines were manufactured using superconducting Nb metallization, which provides a conduction loss-free solution at the operation temperature of 4 K. S-parameter measurements at 4 K temperature were performed and found to be in a good agreement with the simulations. The device measured return loss is better than −10 dB within the frequency band. Furthermore, the circuit was tested as a part of 385 – 500 GHz double sideband heterodyne SIS receiver demonstrating a flat noise temperature response of 80 – 90 K over the entire IF band of 4 – 8 GHz.

Author

Dimitar Milkov Dochev

Chalmers, Department of Radio and Space Science, Advanced Receiver Development

Raquel Monje

Chalmers, Department of Radio and Space Science, Advanced Receiver Development

Vessen Vassilev

Chalmers, Department of Radio and Space Science, Advanced Receiver Development

Victor Belitsky

Chalmers, Department of Radio and Space Science, Advanced Receiver Development

Journal of Physics: Conference Series

17426588 (ISSN) 17426596 (eISSN)

Vol. 234 4

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

Condensed Matter Physics

DOI

10.1088/1742-6596/234/4/042007

More information

Latest update

11/5/2018