SIMULATION METHODS APPLIED TO SINGLETUBE HARMONIC GENERATOR DESIGN,

A method has been found for improving the gain obtained in frequency multipliers through a study of the process of harmonic generation in single-tube circuits. Since distorted waveforms having a fundamental above 500 kc, and prominent harmonic components up to the 10th, could not be observed with fidelity, simulation methods were used. Circuits operating in the audio range were used to study distorted waveforms having the desired shapes. In this way waveforms were produced in the audio-frequency circuits having shapes exactly like those to be expected in frequency multipliers designed to operate at much higher frequencies. All components were properly scaled in electrical size. The conditions to be imposed upon the circuits in order to secure adequate simulation are derived. Experimental data is given for a specific simulation problem. Oscillograms showing the distorted waveforms under various conditions are presented. The emphasis in this work has been directed at securing unity voltage gain utilizing a single pentode tube to obtain a frequency multiplication of 10. Author