SOLID-STATE CIRCUITS
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1962
- Accession Number
- AD0292133
Entities
People
- S. Hamilton
- W.w. Heinz
Organizations
- Rome Laboratory