Beating the quantum limit in SIS mixers
Abstract
The 2LO (double local oscillator) mixer is analyzed in the low-LO-power limit for a perfect SIS (superconductor-insulator-superconductor) diode. It is shown that a 2LO SIS mixer can beat the noise performance of a one-LO mixer by a factor of two. It is suggested that even lower noise is possible with an SIS when operated in some other way.
- Publication:
-
IEEE Transactions on Magnetics
- Pub Date:
- March 1989
- DOI:
- 10.1109/20.92551
- Bibcode:
- 1989ITM....25.1376W
- Keywords:
-
- Mixing Circuits;
- Noise Spectra;
- Quantum Theory;
- Sis (Superconductors);
- Squeezed States (Quantum Theory);
- Bessel Functions;
- Matrices (Mathematics);
- Volt-Ampere Characteristics;
- Electronics and Electrical Engineering