CRYOELECTRIC RECEIVER TECHNIQUES.
Final rept. 30 Dec 63-30 Jun 65,
RCA LABS PRINCETON NJ
Pagination or Media Count:
Investigations were carried out in cryotron, tunneling, and parametric-type amplifiers. The parametric approach appeared most promising. Theoretical analyses indicated that transmission line structure could be designed to serve as a traveling-wave parametric amplifier with a noise figure comparable to or better than an equivalent maser. The immediate goal, however, was to develop a parametric amplifier having a bandwidth of one octave, 1.4 to 2.8 Gcs, with a minimum gain of 13 Db over this broad band. The best structure obtained resulted in a bandwidth of 1000 Mcs in the desired band. Achieving the desired bandwidth is an engineering design and fabrication problem but it is not a fundamental limitation. Obtaining the necessary gain is a more fundamental problem because it requires the fabrication of very thin 300-500 Angstroms low loss insulating films, and fabrication of high quality, very thin 400-500 Angstroms tin films that are continuous and smooth. Using superconducting fins in a coaxial structure has resulted in a gain as high as 27 Db over a 2 Mcs bandwidth and avoids the problem of impedance matching. The final recommendation is that further work be conducted on film fabrication technology. Author
- Electrical and Electronic Equipment