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A STUDY OF THE STABILITY OF THE MOODY-WACKER AMPLIFIER

Date

1965-06

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Degree Level

Masters

Abstract

The work presented in this thesis consists of the study of the stability of the Moody-Wacker amplifier. Generalized stability criteria based on the index principle from complex variables are used extensively in the stability investigations. Initially it is assumed that the tunnel diode is a pure nega-tive resistance device. The stability of two stage amplifiers incorporating two such negative resistances was investigated. The stability of both inductor input and capacitor input cir-cuits using constant k filter- sections and the influence of. increasing the number of filter sections in the transmission line was studied. These investigations reveal that appreciable gain cannot be secured with a reasonable number of filter sec-tions in the transmission line. An attempt was made to achieve stability by making the resistive cut-off frequency of the tunnel diode nearly equal to the cut-off frequency of the transmission line. The ( stability of three stage amplifiers designed on this basis and which incorporate the equivalent circuit of the tunnel diode was investigated. With this arrangement there seems to be a possibility of realizing a gain of the order of 10. The stability of two stage amplifiers using maximally flat Butterworth filters as the lumped transmission line was investigated by applying Routh's criterion. The effect of increasing the number of reactive elements in the transmission line was examined. The tunnel diode was treated to be a pure negative resistance even in these investigations. The results obtained in this case are identical with those obtained using constant k filters as the lumped transmission line.

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Degree

Master of Science (M.Sc.)

Department

Electrical Engineering

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