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A Low-Distortion Fast-Settling Audio Oscillator: A Tribute to the late Peter J. Baxandall, Audio Analog Expert

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This paper is dedicated to the memory of Peter Baxandall, well-known for his work in audio and electronics. It is an exposition and analysis of a low-distortion fast-settling audio oscillator that he designed and built. Normal oscillators are shown to suffer from amplitude instability when the thermally-variable controlling resistance has a long time constant. The genius of the present two-integrator design is that it derives its amplitude stability from the cancellation of two square wave signals, of which one is fixed in amplitude, the other proportional to the oscillator output, with a threshold. A detailed analysis of the oscillator is presented. The result is an oscillator with distortion below 0.01% and settling times of approximately 1 oscillation period. It is particularly useful in automated test equipment.

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