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

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.

Domaines: Electronique; Mathématique discrète [cs.DM]; Modélisation et simulation; Son [cs.SD]; Systèmes et contrôle [cs.SY]

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⟩