Tri-operation Mode AER Retina

December 2012

Juan A. Leñero

Sensor Features

• 3 operations modes: Spatial Contrast Magnitude, Intensity, and TFS (Combined with the others).

• First event-based retina computing spatial contrast and 2 other modes.

• Pixel complexity: 42 transistors+2caps (including arbitration)

Principle of Operation: Contrast Magnitude

Each pixel photocurrent is compared to its neighbours.

If it is higher than the neighbours average value, the pixel will be able to spike.

Pi,j =max (0, Ii,j-(Ii+1,j+Ii-1,j+II,J+1+II,J-1)/4)

Algorithm Simulations (I)

Algorithm Simulations (II)

Schematics: Contrast Magnitude

Schematics: Octopus Mode

We set: Vincr=Vdcr=0V

TFS MODE

Simulations: Contrast Magnitude (I)

Simulations: Contrast Magnitude (II)

Simulations: Intensity Mode

Simulations: Contrast Magnitude+TFS=Contrast Dectection

Simulations: Intesity+TFS