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A CMOS LIF neuron based on a charge-powered oscillator with time-domain threshold logic

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posted on 2023-02-17, 01:43 authored by Javier Granizo CuadradoJavier Granizo Cuadrado, Ruben Garvi, Diego Garcia, Luis Hernandez Corporales

This paper introduces a new CMOS implementation of a spiking Leaky Integrate-and-Fire (LIF) neuron. The circuit does not require any analog circuit block such as comparators or current sources thanks to the use of a ring-oscillator as an integrator and a phase delay detector as threshold logic. The circuit admits both excitatory and inhibitory input spiking signals whose pulse width does not affect the computation. Instead of powering the ring oscillators from a power supply, the input spikes charge a capacitor bank which powers the ring oscillator. The paper describes the operation of the neuron analytically for the input integration and the membrane voltage decay. Also, a circuit-level simulation in 65nm CMOS technology has been performed, achieving a power efficiency of <40fJ/spike.


This research was funded by project PID2020-118804RB-I00 of the Spanish Agency of Research (AEI)


Email Address of Submitting Author

Submitting Author's Institution

University Carlos III of Madrid

Submitting Author's Country

  • Spain