(28th-February-2021)
• Analog advantages:
Ø Exploit physical properties to do network operations, thereby obtain high speed and densities.
Ø A common output line, for example, can sum current outputs from synapses to sum the neuron inputs.
• Analog disadvantages
Ø Design can be very difficult because of the need to compensate for variations in manufacturing, in temperature, etc.
Ø Analog weight storage complicated, especially if non-volatility required.
Ø Weight*input must be linear over a wide range.
• Hybrids combine digital and analog technology to attempt to get the best of both. Variations include:
Ø Internal processing analog for speed but weights set digitally, e.g. capacitors refreshed periodically with DAC's.
Ø Pulse networks use rate or widths of pulses to emulate amplitude of I/O and weights.
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