An Improved Linearity Ring Oscillator-Based Current-to-Digital Converter

Anthony Wall; Paul Walsh; Khosrov Sadeghipour; Ivan O'Connell; Daniel O'Hare

doi:10.1109/LSSC.2022.3198367

An Improved Linearity Ring Oscillator-Based Current-to-Digital Converter

Anthony Wall
, Paul Walsh
, Khosrov Sadeghipour
, Ivan O'Connell
, Daniel O'Hare

Research output: Contribution to journal › Article › peer-review

Abstract

Many biosensors produce single-ended current outputs. Lab-on-chip applications demand parallel readout channels requiring low area current-to-digital converters. High HD2 has limited the current controlled ring oscillator's (CCROs) adoption as a low area, single-ended converter. This work improves CCRO open loop linearity by 10 dB. A wide-bandwidth current buffer is also designed. A low area (0.0025 mm2), low power (357 μ W), single-ended, and 1 MHz bandwidth converter suitable for array readout is presented with the measured performance.

Original language	English
Pages (from-to)	202-205
Number of pages	4
Journal	IEEE Solid-State Circuits Letters
Volume	5
DOIs	https://doi.org/10.1109/LSSC.2022.3198367
Publication status	Published - 2022

Keywords

ADC
current
current to digital
data converters
direct digitization
flipped voltage follower (FVF)
linearization techniques
phase to digital
ring oscillator
VCO-based ADC

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10.1109/LSSC.2022.3198367

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title = "An Improved Linearity Ring Oscillator-Based Current-to-Digital Converter",

abstract = "Many biosensors produce single-ended current outputs. Lab-on-chip applications demand parallel readout channels requiring low area current-to-digital converters. High HD2 has limited the current controlled ring oscillator's (CCROs) adoption as a low area, single-ended converter. This work improves CCRO open loop linearity by 10 dB. A wide-bandwidth current buffer is also designed. A low area (0.0025 mm2), low power (357 μ W), single-ended, and 1 MHz bandwidth converter suitable for array readout is presented with the measured performance.",

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AU - Walsh, Paul

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AU - O'Connell, Ivan

AU - O'Hare, Daniel

PY - 2022

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N2 - Many biosensors produce single-ended current outputs. Lab-on-chip applications demand parallel readout channels requiring low area current-to-digital converters. High HD2 has limited the current controlled ring oscillator's (CCROs) adoption as a low area, single-ended converter. This work improves CCRO open loop linearity by 10 dB. A wide-bandwidth current buffer is also designed. A low area (0.0025 mm2), low power (357 μ W), single-ended, and 1 MHz bandwidth converter suitable for array readout is presented with the measured performance.

AB - Many biosensors produce single-ended current outputs. Lab-on-chip applications demand parallel readout channels requiring low area current-to-digital converters. High HD2 has limited the current controlled ring oscillator's (CCROs) adoption as a low area, single-ended converter. This work improves CCRO open loop linearity by 10 dB. A wide-bandwidth current buffer is also designed. A low area (0.0025 mm2), low power (357 μ W), single-ended, and 1 MHz bandwidth converter suitable for array readout is presented with the measured performance.

KW - ADC

KW - current

KW - current to digital

KW - data converters

KW - direct digitization

KW - flipped voltage follower (FVF)

KW - linearization techniques

KW - phase to digital

KW - ring oscillator

KW - VCO-based ADC

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JO - IEEE Solid-State Circuits Letters

JF - IEEE Solid-State Circuits Letters

ER -

An Improved Linearity Ring Oscillator-Based Current-to-Digital Converter

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