RoGeorge Cell

A new type of Four-Quadrant Multiplier, with an analog input signal and a digitally controlled multiplication factor

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This is a circuit that takes an analog input signal, then multiply it by a digital factor. The output of the circuit is an analog signal too. The multiplication factor is digitally controlled by a micro-controller, and it works in all four quadrants.

Even thought a micro-controller is involved, the signal path is pure analog from input to output.

Having a digitally controlled multiplication allows to implement complex algorithms and a level of automation that can not be achieved with a classical analog multiplier.

Combining the analog signal path with the digitally multiplication factor, this circuit is trying to harvest the best from the both worlds of analog and digital.

I am in a hurry right now, so I will just drop some pictures, and will come later with details.

Block diagram


  • multiplier
  • divider
  • signal inverter
  • volume control
  • functions generator, custom waveform
  • amplitude, phase, frequency, IQ modulator/de-modulator
  • etc.

Prototype Schematic

First implementation - 2 multiplier cells

3D Printing AVR ARduino Art Audio Automation BeagleBone Bluetooth Cameras Clock Drones Environment Hardware IoT LED Medical Music Radio Raspberry Pi Remote Control Robotics Rockets Satellites Science Security Software Virtual Reality Wearables

  • 1 × TPL0202-10 Data Converters / Digital Potentiometers
  • 1 × OPA1654 Amplifier and Linear ICs / Operational Amplifiers
  • 1 × Arduino Nano

View all 2 project logs

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