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A versatile waveform generator for testing neuroelectric signal processors.

¹Department of Electrical Engineering, Escola Politécnica da Universidade de São Paulo, Brazil.

Journal of Neuroscience Methods

|August 1, 1989

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A novel multi-channel waveform generator was developed for testing neuroelectric signal processors. This versatile device efficiently generates realistic action potentials and evoked potentials using switched capacitor filters.

Area of Science:

Biomedical Engineering
Neuroscience Instrumentation

Background:

Testing neuroelectric signal processors requires accurate simulation of biological signals.
Conventional active filters present design challenges for generating complex waveforms.

Purpose of the Study:

To design and implement a versatile multi-channel waveform generator for neuroelectric signal processing.
To utilize switched capacitor filters for simplified and efficient signal generation.

Main Methods:

Designed a multi-channel waveform generator utilizing a second-order switched capacitor filter.
Excited the filter with brief rectangular pulses to generate smooth transient signals.
Incorporated independently adjustable front-panel controls for signal parameters.

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Main Results:

The generator successfully produces signals mimicking action potentials and evoked potentials.
Switched capacitor filter integration simplified the design compared to active filters.
Versatile control over signal duration, waveshape, latency, amplitude, and signal-to-noise ratio was achieved.

Conclusions:

The developed waveform generator is a valuable tool for testing neuroelectric signal processors.
Its versatility and simplified design enhance its utility in neuroscience research.
The generator facilitates rigorous evaluation of evoked potential acquisition and multi-unit action potential detection systems.