A STUDY TO IMPROVE CRYSTAL VIDEO DETECTORS.
Interim technical rept., Jun-Dec 65,
AMERICAN ELECTRONIC LABS INC COLMAR PA
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Emphasis was directed at improving the sensitivity of crystal video detectors and at establishing a better understanding of the actual mechanisms involved in crystal video detection. A theoretical investigation led to the development of a series of expressions relating to detector conversion efficiency and noise behavior these expressions permit the calculation of theoretically obtainable sensitivities. The influence of detector parasitic parameters on detector sensitivity is explained. A series of measurement techniques were developed which enable detector diode evaluation to be made in terms of conversion efficiency and noise properties. New semiconductor materials were evaluated for use as crystal video detectors. The materials evaluated include p- and n-type silicon, GaSb, GaAs, and Ge. The highest tangential sensitivities presently obtained are -63 dbm for a 2 Mc video bandwidth and at an RF frequency of 2 Gc. Theoretically predicted sensitivity indicates that there is still an improvement of 4 db that can be made. Author
- Electrical and Electronic Equipment
- Non-Radio Communications