Design of optimum phase-shift oscillators
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In the designing of phase-shift oscillators it is advantageous to make the loss in the phase shift circuit a minimum, so that an amplifier of minimum gain may be used. A method of obtaining such a design has been developed which seems applicable to any one of the great variety of phase-shift oscillator circuits. This method is applied to two different phase-shift oscillators to obtain design equations and curves. The first example is that of one of the most common phase-shift oscillators. The results appear to agree with those obtained by a previous analysis which does not have the versatility of the present method. The second example is that of one of the relatively new cathode-follower phase-shift oscillator circuits which seem to have promise in the development of low-distortion oscillators. Since the gain of a cathode-follower amplifier is below unity, the determination of optimum phase-shift circuits becomes extremely important.