A Compact Integrate-and-Fire Neuron Circuit Embedding Operational Transconductance Amplifier for Fidelity Enhancement

Arati Kumari Shah, Eou Sik Cho, Jisun Park, Hyung-Soon Shin, Seongjae Cho

Research output: Contribution to journalArticlepeer-review


In this study, a compact CMOS integrate-and-fire (I&F) neuron circuit embedding an operational transconductance amplifier (OTA) has been designed for enhancing the fidelity in output generation. The OTA block in the neuron circuit allows for maintaining stability in I&F functions even under high-frequency operation conditions. The designed neuron circuit consists of OTA circuit, membrane capacitor, inverter, and reset MOSFET, from which the area occupancy is approximated to be 22×43 μm2. Featuring the simple and compact structure, the proposed neuron circuit shows the capability to control the firing frequency by adjusting the amplitude and temporal width of the synaptic pulse, resulting in high fidelity in I&F function. Series of circuit simulations have been performed to validate the systematic operations of the neuron circuit by HSPICE presuming the 0.35-μm Si CMOS technology. Moreover, temperature dependence was also investigated so that the robustness and stability of the neuron circuit at elevated operation temperatures were verified. The results provide a practical way of designing a compact and reliable neuron circuit working with the synaptic devices having deviations in operation characteristics in the hardware-oriented spiking neural network (SNN).

Original languageEnglish
Pages (from-to)53932-53938
Number of pages7
JournalIEEE Access
StatePublished - 2023

Bibliographical note

Funding Information:
This work was supported by the Ministry of Science and ICT (MSIT) of South Korea under Grant 2021M3F3A2A01037927 and Grant 2022M3I7A1078936.

Publisher Copyright:
© 2013 IEEE.


  • circuit simulation
  • fidelity
  • hardware-oriented spiking neural network (SNN)
  • Integrate-and-fire neuron circuit
  • operational transconductance amplifier (OTA)
  • stability


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