ETH2006 xor

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Revision as of 11:01, 28 October 2006

XOR gate

The XOR gate's PoPs output activity should be correlated to the PoPs input activity as shown in the picture:

 input A ^
         | H  D  L
         | D  D  D
         | L  D  H
         +--------->
            input B

 output: High, Low, Dont care

implementation

current

Part to be used in the prototype system: [http://partsregistry.org/Part:BBa_J34200 BBa_J34200]

implementation alternatives

when we knew that we were going to implement an XOR, we came up with different artificial variants, without knowing whether such a system would exist in biology or not. while our biologists started searching the literature, we modelled the variants to see which we might want to favor.

here, we pick out 2 variants with correspoinding simulation results to give an idea of the process of development.

modeling

we are interested in the input/output behavior at steady state, that is when the system has reached equilibra and the concentrations of concerned species don't change anymore. since we have 2 inputs and 1 ouptut, simulation results will be illustrated as a surface plot, inputs on the x/y axes and output on the z axis.

ideal xor gate

the expected input/output behavior of an ideal xor gate looks like this (with less green being better):

note that the anterior low (blue) part has low inputs, the rear one has high inputs.

simulation results / sensitivity analysis

assembly procedure

test procedure

test results

parts

[http://partsregistry.org/Part:BBa_J34100 BBa_J34100]

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