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A minimal passive model of the operational amplifier: application to Sallen--Key analog filters

Müller Remy 1 Thomas Hélie 1
1 S3AM - Systèmes et Signaux Sonores : Audio/Acoustique, instruMents
STMS - Sciences et Technologies de la Musique et du Son
Abstract : This papers stems from the fact that, whereas there are passive models of transistors and tubes, a minimal passive model of the operational amplifier does not seem to exist. A new behavioural model is presented that is memoryless, fully described by its interaction ports, with a minimal number of equations, for which a passive power balance can be defined. The proposed model handles saturation, asymmetric power supply, and can be used with non-ideal voltage references. To illustrate the model in audio applications , the non-inverting voltage amplifier and a saturating Sallen-Key lowpass filter are considered.
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https://hal.archives-ouvertes.fr/hal-02275503
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Submitted on : Friday, August 30, 2019 - 7:52:24 PM
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  • HAL Id : hal-02275503, version 1

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Müller Remy, Thomas Hélie. A minimal passive model of the operational amplifier: application to Sallen--Key analog filters. 22nd International Conference on Digital Audio Effects (DAFx-19), Aug 2019, Birmingham, France. ⟨hal-02275503⟩

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