2008•Unpublished venueRequires access

Design guidelines for minimum harmonic distortion in a wien oscillator with automatic amplitude control system

G. Palumbo, Melita Pennisi, Salvatore Pennisi

Abstract

In sinusoidal oscillators, the nonlinear behavior of the automatic amplitude control mechanism is the main responsible for harmonic distortion. For instance, THD of Wien oscillators with diode-based amplitude control may increase up to 10 dB compared to that of the basic structure. In this paper, THD due to both the operational amplifier and the amplitude stabilization mechanism is analytically evaluated, leading to an optimum design strategy which minimizes distortion. The accuracy and viability of both the proposed analysis and design approach is confirmed experimentally.

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Key concepts: Total harmonic distortion, THD analyzer, Amplitude distortion, Amplitude, Distortion (music), Control theory (sociology), Nonlinear distortion, Amplifier