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Non-Ideal Operational Amplifier Emulation in Digital Model of Analog Distortion Effect Pedal

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Digital models of analog guitar effects pedals have largely ignored the impact of non-ideal components on the resulting timbre, though the physical limitations of analog components are sometimes key to achieving the intended effect. The signature sound of the Pro Co RAT is largely attributed to the non-ideal characteristics of the Motorola LM308 operational amplifier, particularly the slew-rate, gain-bandwidth product and supply voltage. Analysis of harmonic and spectral content shows that the inclusion of these non-ideal component characteristics results in a more accurate recreation of the Pro Co RAT distortion effect. In a comparison of real-time digital models, the additional computational cost of the non-ideal model was negligible.

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AES - Audio Engineering Society