Curtis CEM3396 Synth-on-a-Chip
A complete analog synthesizer voice on a single 24-pin IC, integrating dual waveshaping DCOs, 4-pole resonant VCF, and dual VCAs (Oberheim Matrix-6/1000, Cheetah MS6).
# Mathematical Formula & Architecture
Logic SpecificationDual digitally controlled waveform generators + 24dB/oct resonant lowpass filter + final VCA in one DIP package.
CEM3396 Architecture:
Digital Clock 1/2 ---> Waveshapers (Saw/Pulse/Triangle) ---> Mix VCA
---> 4-Pole 24dB Lowpass Filter ---> Pan/Output VCA# Deep Technical Analysis & Historical Context
In 1985, Oberheim commissioned Curtis Electromusic to create a radically dense, cost-effective analog voice IC. The result was the CEM3396. Unlike traditional synths requiring dozens of op-amps, capacitors, and matched transistors per voice, the 3396 squeezed two independent audio waveform generators, a noise generator, a 4-pole low-pass resonant filter, and output amplitude controls into a single 24-pin package. In the Oberheim Matrix-1000, six of these chips provide a full 6-voice polyphonic analog engine inside a single 1U rackmount unit.
Common Studio Pitfall & Hardware Hazard
Matrix-1000 units often develop stuck notes or distorted voices when a single CEM3396 voice chip overheats and fails internally.
# Hardware Synthesizers Using This Technology
Click any synthesizer below to explore its specific memory protect routine, factory soundbanks, and Web MIDI SysEx cloud backup engine:
# Frequently Asked Engineering Questions
Can I replace a CEM3396 in a Matrix-1000?
Yes, but be aware of the two revisions: the standard wide-body CEM3396 and the narrow-body CEM3396. They are pin-compatible but have different physical footprints.
Related Engineering Concepts
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