Time-based Sensor Interface for Dopamine Detection

Olaitan Olabode, Marko Kosunen, Vishnu Unnikrishnan, Tommi Palomäki, Tomi Laurila, Kari Halonen, Jussi Ryynänen

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
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This paper describes the design of an integrated sensor interface for dopamine detection. The sensor interface circuit fabricated in 65 nm CMOS technology utilizes a time-based analog-to-digital conversion circuit built around a ring oscillator. The circuit supports a wide input current range of±1.2 µA and sampling rate of 1 - 20 kHz, enabling sub-second detection of neurochemicals within the supported current range. Measured results with physiologically relevant dopamine concentration of 500 nM demonstrate the ability of the sensor interface circuit to detect oxidation and reduction current peaks, which provides information about the release times and redox potentials of the neurochemical. This chemical information is essential in neurostimulation treatment of neurological and neurodegenerative diseases.
Original languageEnglish
Article number9144288
Pages (from-to)3284-3296
Number of pages13
JournalIEEE Transactions on Circuits and Systems - I: Regular Papers
Issue number10
Publication statusPublished - Oct 2020
MoE publication typeA1 Journal article-refereed


  • Neurosignal acquisition
  • Neurochemical sensing
  • Dopamine detection
  • Oscillator-based ADC
  • Biosensors
  • DLC


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