ISSTT Proceedings

ISSTT Proceedings

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Design of a 275-370 GHz SIS mixer with image sideband rejection and stable operation

Authors:
A. Navarrini, D. Billon-Pierron, K.F. Schuster, B. Lazareff
Abstract:
We discuss the design and optimisation of a SIS Single Side Band (SSB) mixer covering the 275-370 GHz frequency band for astronomical applications. The junction is probe-coupled to the full height waveguide. An adjustable circular noncontacting backshort allows SSB tuning in either USB or LSB in the whole RF band. A [approximately] 30 % operating bandwidth can be achieved by using parallel inductive tuning of the junction capacitance. The calculated SSB receiver noise temperature referred to the mixer input is in the range 25-38 K. A stability criterion for an SSB mixer with distinct signal and image termination impedances under typical operating conditions is derived. We show that when an inductive series matching structure with a two-stage impedance transformer is used to compensate the junction capacitance, the mixer cannot be operated over a wide frequency range in a stable way. An inductive parallel matching structure with a single-stage transformer allows us to fulfill the necessary conditions of stability.
Categories:
Poster Session
Year:
2001
Session:
5
Full-text:
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Page Number(s):
205-214