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On the relationship between schottky barrier capacitance and mixer performance at cryogenic temperatures
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Romanofsky, Robert R. |
| Organization | The National Aeronautics and Space Administration (NASA) |
| Copyright Year | 1996 |
| Abstract | The flat-band voltage is the Schottky junction voltage required to shrink the depletion width to zero. At cryogenic temperatures, mixer diodes are generally biased and/or pumped beyond the flat-band condition to minimize conversion loss and noise figure. This occurs despite the presumed sharp increase in junction capacitance near flat-band, which should instead limit mixer performance. Past moderate forward bias, the diode C-V relationship is difficult to measure. A simple analytic expression for C(V) is usually used to model and predict mixer performance. This letter provides experimental data on C(V) at 77 K based on a microwave measurement and modeling technique. Data is also provided on the conversion loss of a singly balanced mixer optimized for 77 K operation. The connection between junction capacitance, flat-band potential, and conversion loss is examined. It is shown that the analytic expression greatly overestimates the junction capacitance that occurs as flat-band is approached. |
| File Size | 198217 |
| File Format | |
| Alternate Webpage(s) | http://www.archive.org/details/nasa_techdoc_19970026859 |
| Archival Resource Key | ark:/13960/t90874w00 |
| Language | English |
| Publisher Date | 1996-08-01 |
| Publisher Institution | Glenn Research Center |
| Access Restriction | Open |
| Subject Keyword | Monkeys Physiological Responses Immune Systems Leukocytes Constraints Space Shuttles Space Flight Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
