A TLBO Optimized TDC for Biomedical Applications

Ghanavati, Behzad; Abiri, Ebrahim; Azhdari, Niloar; Salehi, Mohamad Reza

doi:10.1109/icee.2018.8472459

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…The result of the conversion is a digital word representing the time difference and, hence, the sampled analog value, similar to the digital output word in analog-to-digital (AD) conversion. Time-mode systems find more and more applications in the biomedical field, such as biomedical imaging applications [5], diffuse optical tomography measurements [6], and measuring the electrocardiogram R-R interval [7].…”

Section: Introductionmentioning

confidence: 99%

A 10-hit, 771 nW Time-Mode ADC with a 2-Step TDC for Bio-Signal Acquisition

Kandilakis

Serdijn

Akgun

2021

2021 IEEE Biomedical Circuits and Systems Conference (BioCAS)

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In this paper, we present the design of a lowvoltage, low-power, and small-area time-mode ADC (TM-ADC) for bio-signal sensing applications. The proposed time-mode ADC (TM-ADC) consists of a programmable oversampling ratio (OSR), voltage-controlled ring oscillator (VCRO) based analogto-time converter (ATC), followed by an asynchronous unfolded SAR coarse TDC and an asynchronous, enhanced-range fine flash TDC. The integrated circuit has been implemented in a standard CMOS 65 nm process and its performance has been evaluated through extracted transient noise simulations. The ADC consumes 771 nW at a sampling rate of 2.2 kHz from a 0.5V supply voltage and achieves 10-bit resolution in a total area of 0.014 mm 2 . The simulation results indicate DNL and INL values of +0.86/-0.83 and +0.88/-1.79, respectively, an SNDR of 60.7 dB and an ENOB of 9.8 bits for a 10mV peak-to-peak signal 1 kHz input signal.

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Section: Introductionmentioning

confidence: 99%