Sound Semiconductor New Mixer Chip Provides Voltage Control of Six Inputs into a Single Output

Sound Semiconductor announced the ProCircuit 6-into-1 Voltage Controlled Mixer. Based on a new-generation Operational Transconductance Amplifier (OTA), the patent pending SSI2190 allows current-mode linear control of each channel. Differential voltage inputs provide design flexibility, and a high-compliance current output makes summing from multiple sources - including other SSI2190’s - an easy endeavor.

Recently, the very existence of current feedback as opposed to voltage feedback has been called into question. This article analyzes and tests simple versions of voltage and current feedback amplifiers and demonstrates some differences in their characteristics. The article provides an excellent overview of historical terminology and how the more modern terms came about and their dependence on context. These articles were originally published in audioXpress, July and August 2018.