Accession Number:

AD0292133

Title:

SOLID-STATE CIRCUITS

Descriptive Note:

Corporate Author:

ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y

Personal Author(s):

Report Date:

1962-10-01

Pagination or Media Count:

1.0

Abstract:

Two types of broad-band solid-state limters for protecting receivers operating in the 400 to 800 mc range are being investigated--ferrite limiters and varactor-diode limiters. Single crystal gallium-substituted yttrium-iron garnet gallim-YIG having a saturation magnetzation 4 pi M sub s of 420 gaus has been considered for the ferrite limiter. Several attempts to obtain limiting action with a gallium-YIG sphere in a cross-resonator structure were unsuccessful. As a result, a detailed program was initiated to measure some of the important crystal characteristics such as anisotropy, linewdth, and susceptibility decline. It was found that the crystal has relatively high first- and secondorder normalized anisotropy constants 9about -110 and -30 oersteds and large linewidths about 30 oersteds. Measuremens on the susceptibility decline correlated well with the measured linewidths. Two types of varactor diodes are being investigated for use in nonparametric-type limiters--PN and PIN. The PN diodes were tested in a limiter configration at high pulse powers using a 1-megawatt L-band radar. The incident burnout energy was found to be 87,000 ergs, which is about ten times greater than expected. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE