Download Digital simulation of the diode ring modulator for musical applications In this article, a model of the diode ring modulator is developed, which is based on a model from the literature, but modified to suit musical applications. After a brief introduction to analog ring modulation, a substitute circuit for the diode ring modulator is presented and analyzed, leading to a system of ordinary differential equations (ODEs) of first order. The equations are solved by using Euler’s method. The model is compared with a real ring modulator using the same input waveforms, showing a good match between the simulation and the real device.
Download Asymmetries make the difference: A nonlinear model of transistor-based analog ring modulators This work analyzes analog ring modulators based on bipolar transistors, such as the EMS VCS3 and the Doepfer A-114. It is shown that the perfectly symmetric standard model from literature [1][2] does not suffice to describe crucial first-order effects. A detailed analysis of the circuit using mismatched parts is performed. The insights gained from this analysis are used to formulate a digital model which can be easily implemented and which captures the essential audible effects.