INVESTIGATION OF CONTROL TECHNIQUES FOR ELECTRO MAGNETIC INTERACTION IN LOW-LEVEL CIRCUITS.
Final rept., May 62-June 63.
AIRBORNE INSTRUMENTS LAB DEER PARK N Y
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Various methods are preseo effectively avoid or reduce electromagnetic interference in low-level circuits. Video amplifiers are examined for interference in the form of inter modulation and cross-modulation products. We have found that 1 Interference levels are not greatly affected by temperature in a well designed circuit, 2 The trade-off in gain by using a degenerative-emitter configuration is extremely helpful in reducing the effects of interference, and 3 In cases where there is de sign freedom, the use of two low-gain stages cas caded is far superior to a single high-gain stage, with respect to interference levels. Experimental data show these results, and theory is developed that is consistent with the observed results. Two logic blocks are examined by investigating their susceptibility to interfering signals on trigger input and power-supply leads. In par ticular, a bistable and an astable multivibrator are chosen. The results of this investigation show that single isolated circuits of this type are relatively immune to all but very large interfering signals. Experimental data and an analysis of the coupling mechanism that causes failure are presented. Author