Abstract
This chapter examines the oscillation theory by combining the basic oscillator components and investigates the overall effect. The essential difference between those oscillators designate as of the negative-resistance variety and feedback oscillators, involves a practical consideration that does not appreciably affect the theory of operation. In the negative resistance oscillator, the tank circuit can be separated from the device exhibiting negative resistance. In the feedback oscillator, the oscillation provoking device no longer displays negative resistance if one severs it from the resonant tank. The tunnel diode is a two-terminal semiconductor device with direct capability of inducing oscillation in an associated tank circuit. From a practical viewpoint, this provides the most illuminating demonstration of the principle of negative resistance. When the tunnel diode is used in conjunction with reactive elements, two types of oscillation may be obtained. Either sinusoidal or relaxation oscillations will occur, depending very largely upon the regulation of D.C. power source and its voltage. An alternate method of increasing output power is to connect simple tunnel-diode oscillators in series, at the same time modifying the D.C. bias network so that only one battery or other D.C. source is needed. This technique is not limited to two diodes, rather, any number can be so cascaded.
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