Improv doc

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# Circuit implementing the fhn neuron.
- The circuits in the schematics implement the FHN neuron described.
- The FHN neuron is an implementation of the circuit described in (Ribar, L. (2019). Synthesis of neuromorphic circuits with neuromodulatory properties [Apollo - University of Cambridge Repository]. https://doi.org/10.17863/CAM.53750). The OTA and CMFB are well known designs that can be found in textbooks.

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# FitzHugh-Nagumo
# Circuit implementing the fhn neuron.
- The circuits in the schematics implement the FHN neuron described.
- The FHN neuron is an implementation of the circuit described in (Ribar, L. (2019). Synthesis of neuromorphic circuits with neuromodulatory properties [Apollo - University of Cambridge Repository]. [DOI: 10.17863/CAM.53750](https://doi.org/10.17863/CAM.53750)). The OTA and CMFB are well known designs that can be found in textbooks.
## Circuit equation
$$
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- $I_{fast} = a_{fast} \tanh(v - v_{off,fast})$
- $I_{slow} = a_{slow} \tanh(v_{slow} - v_{off,slow})$
## Examples
See the following interactive notebook for a practical example: