Analysis and Design of R-C Phase-Shift Oscillator Networks

The phase-shift oscillator is a resistance-capacitance tuned oscillator normally employing three or more L-sections in cascade. The frequency of oscillation may be uniquely determined and expressed as a function of the network parameters. In recent years various papers have been published concerning resistance-capacitance phase-shift oscillators, most of which discussed rather specific or novel circuits. Among the first papers only the basic circuit was discussed; its simplicity as a stable low-frequency sine-wave oscillator using only one tube was indicated. Other points brought out were compactness, lightness, and low expense of building such oscillators, since they contained no transformers and only a few resistors and capacitors. As time passed, the requirements for oscillators of this type increased and innovations of the basic network were investigated. The purpose of this report is the analyze more generally the oscillator networks, specifically for use in designing frequency-modulated subcarrier oscillators (as used in FM/FM telemetering systems) and in general to correlate various scattered material for a better understanding of design procedure.