Uncalibrated integrable wide-range single-supply portable interface for resistance and parasitic capacitance determination

Marcellis, Andrea De; Depari, A.; Ferri, Giuseppe; Flammini, A.; Marioli, D.; Stornelli, Vincenzo; Taroni, A.

doi:10.1016/j.snb.2007.10.068

Cited by 29 publications

(8 citation statements)

References 23 publications

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“…Depending on the values of the passive components, each TPS gives a specific phase shift equal to (7) that is a nonlinear function of whose value is changed by the voltage so to obtain the "in-quadrature" condition. However, for small phase shifts, since , (7) becomes (8) and the consequent linearity range of the transfer function depends on the values of the passive components used in the TPS. Under these conditions, to achieve a linear transfer function of the circuit in the phase shift range, we used a cascade of six TPSs.…”

Section: Proposed Autocalibrating Pvc Circuit Designmentioning

confidence: 99%

A Novel Analog Autocalibrating Phase-Voltage Converter for Signal Phase-Shifting Detection

2011

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In this study, we present a novel analog read-out circuit, operating a phase-voltage conversion, suitable for the detection of signal phase shifting for micro-and nano-sensor system applications. Its main characteristics are the following: good linearity in the considered phase-shift range, capability of phase sign detection, independence from input signal amplitudes, setting and zeroing of the offset, autocalibration, high sensitivity and resolution, and high accuracy and precision. For these reasons and, in particular, thanks to its simple internal topology, the developed circuit can be considered as a suitable analog interface for portable measurement systems. Experimental results, achieved through a laboratory breadboard and using sample signals, have confirmed, with respect to the other solutions reported in literature, better linearity, higher sensitivity (equal to about 37 mV/degree in the 90 phase-shift range) and resolution (lower than 0.1 in the same phase-shift range) for both positive and negative phase variations. When a more reduced phase-shift range must be detected (i.e., for optical sensor applications), it is possible to set the circuit parameters to further increase sensitivity and resolution.

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Section: Proposed Autocalibrating Pvc Circuit Designmentioning

confidence: 99%

A Novel Analog Autocalibrating Phase-Voltage Converter for Signal Phase-Shifting Detection

2011

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“…Concerning the EX-OR digital block, this has been implemented, at transistor level, through a traditional topology [29]. Before the chip fabrication, corner analysis have been performed in CADENCE environment, to evaluate the maximum expected error on the period estimation (due to the technological process), considering two main cases: the worst power case (WP, minimum operating temperature = −50 • C, maximum supply voltage = 3.63 V) and the worst speed case (WS, maximum operating temperature = 110 • C, minimum supply voltage = 2.97 V).…”

Section: The Proposed Integrated Interface For Wide-range Resistive Gmentioning

confidence: 99%

“…It presents low-power consumption (about 4 mW) and low single supply voltage (3.3 V) to be used for portable applications. Thanks to the very small dimensions, it is suitable to be easily replied on silicon substrate, giving the possibility to manage sensor arrays [28,29].…”

Section: Introductionmentioning

confidence: 99%

A single-chip integrated interfacing circuit for wide-range resistive gas sensor arrays

Ferri

Carlo

Stornelli

et al. 2009

Sensors and Actuators B: Chemical

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“…The effect of the parasitic capacitance can be taken into account by adding a second comparator (Comp 0 ) tuned on a different threshold. In such way, both sensor resistive and parasitic capacitance values can be estimated by the measurement of the period T and the duty-cycle T on /T [4]. Such interface has been successfully implemented in a standard CMOS technology as an integrated circuit.…”

Section: Introductionmentioning

confidence: 99%

A new interface for resistive chemical sensors with low measuring time

Depari

Flammini

Marioli

et al. 2009

2009 IEEE Intrumentation and Measurement Technology Conference

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The main issue concerning metal oxide (MOX) gas sensors is mostly related to the wide range of resistive values the sensors can show. In addition, some sensors could have baseline resistive value up to tens of gigohms. To avoid the use of expensive pico-amperometers, different solutions have been recently proposed, exploiting the resistance-to-time conversion (RTC) technique. They show good linearity and are suitable for the integration in a chip together with the elaboration unit, but they may require long measurement time (tens of seconds) if high resistance values need to be estimated. In this work, a new method is proposed to reduce the measuring time, keeping the advantages offered by the RTC approach. The applicability of the interface is therefore extended for solutions requiring detailed information of the sensor response, such as the characterization of new sensors (e.g. nanowires) or the behavior analysis during non-standard thermal profiles. Particularly, an effective architecture, based on moving thresholds, has been proposed, simulated and experimentally tested with commercial resistors (values between 1 MΩ and 100 GΩ).

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Uncalibrated integrable wide-range single-supply portable interface for resistance and parasitic capacitance determination

Cited by 29 publications

References 23 publications

A Novel Analog Autocalibrating Phase-Voltage Converter for Signal Phase-Shifting Detection

A Novel Analog Autocalibrating Phase-Voltage Converter for Signal Phase-Shifting Detection

A single-chip integrated interfacing circuit for wide-range resistive gas sensor arrays

A new interface for resistive chemical sensors with low measuring time

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