An integrated improved CCII topology for resistive sensor application

Ferri, Giuseppe; Stornelli, Vincenzo; Fragnoli, Mauro

doi:10.1007/s10470-006-7415-3

Cited by 36 publications

(13 citation statements)

References 9 publications

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“…Figure 8 shows a CCII-based analog interface suitable for DC-excited resistive sensor applications. The advantage of this CM circuit in the sensor interfacing is its capability to perform the offset compensation, in this way the output voltage is linearly proportional to the resistive variation [26]. The only feature to be considered is the design of CCIIs having negligible parasitic impedances (see a quasi-ideal configuration reported in Figure 23).…”

Section: Fig 7 Resistance-to-current Converter As a Resistive Sensomentioning

confidence: 99%

“…Moreover, in this way, especially referring to those solutions based on oscillating circuits, the relative error between ideal/theoretical and measured oscillation periods becomes negligible. At least, in this paragraph, we will show also a possible transistor level integrated solution of a CCII [26], developed in AMS 0.35μm standard CMOS technology. It can be employed so to develop suitable integrated versions of previous described CM sensor interface solutions [3].…”

Section: Ota and CCII Cmos Transistor-level Solutionsmentioning

confidence: 99%

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Resistive Sensor Interfacing

Marcellis

Ferri

Mantenuto

2013

Giant Magnetoresistance (GMR) Sensors

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Abstract. This chapter has the aim to give a complete overview on the first analog front-ends, describing some circuit and system solutions for the design of electronic interfaces suitable for resistive sensors showing different variation ranges: small, as in dedicated-application GMR sensors; wide, especially referred to GMR sensing devices whose baseline is unknown. After a description of the main interface parameters, the authors present several solutions, most of which do not require any calibration. These solutions are different according to the entity of resistive sensor variations, can utilize either AC or DC excitation voltages for the employed sensor and are developed in Voltage-Mode (VM, which considers the use of either the Operational Amplifier (OA) or the Operational Transconductance Amplifier (OTA) as main active block) as well as in Current-Mode (CM) approach (being in this case the Second Generation Current Conveyor (CCII) the active device). The described interfaces can be easily fabricated both as prototype boards, for a fast characterization, and as integrated circuits, also using modern microelectronics design techniques, in a standard CMOS technology with Low Voltage (LV) and Low Power (LP) characteristics, especially when designed for portable applications and instrumentation. Moreover, thanks to their reduced sizes in terms of chip area, the proposed solutions are suitable for being used for sensor arrays applications, where a number of sensors is employed, as in portable systems, to detect different environmental parameters.

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Section: Fig 7 Resistance-to-current Converter As a Resistive Sensomentioning

confidence: 99%

Section: Ota and CCII Cmos Transistor-level Solutionsmentioning

confidence: 99%

Resistive Sensor Interfacing

Marcellis

Ferri

Mantenuto

2013

Giant Magnetoresistance (GMR) Sensors

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“…Second generation current conveyors are current-mode basic blocks [20][21][22][23][24][25][26] utilized in numerous applications, both in linear and nonlinear contexts, which sometimes can excellently substitute the traditional operational amplifier.…”

Section: The Second Generation Current Conveyormentioning

confidence: 99%

“…If this load impedance is negligible with respect to the transistor output resistances, β parameter is very close to its ideal unitary value. This means that non ideality problems are related to the parasitic impedances at CCII terminals that have to be necessarily taken into account (see Figure 1) in a large number of low voltage low power applications [22][23][24][25][26]; in particular, the main attention must be paid in the design of low-impedance X node and high-impedance Z terminal. The parasitic impedance at X node, that is required to be low, is inversely proportional to the input transistors g m .…”

Section: The Second Generation Current Conveyormentioning

confidence: 99%

A novel general purpose current mode oscillating circuit for the read-out of capacitive sensors

Marcellis

Carlo

Ferri

et al. 2009

2009 3rd International Workshop on Advances in Sensors and Interfaces

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In this paper we present a novel general purpose current mode (CM) solution for the interfacing of capacitive sensors. The designed circuit, which utilizes only two second generation current conveyors (CCIIs) as active blocks, allows to detect, through a capacitance-to-time conversion (C-T), capacitive values as well as their variations (also lower than 1pF) both in a small and a wide range. Its main operation is based on a current differentiation, instead of voltage integration, typical of interfaces developed in the voltage-mode approach. The proposed circuit, which does not need any initial calibration, has been designed as integrated solution at transistor level in a standard CMOS 0.35µm technology. Waiting for the chip fabrication, preliminary experimental results have been performed through a discrete-component board and sample capacitors and resistors. Both simulation and experimental results have shown low percentage errors and a good agreement with theoretical expectations for more than five frequency decades. The system sensitivity has been set to about 1.8µs/pF.

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“…RTC electronic circuits where sensor is DC-powered have been recently proposed. Their main limit concerns the difficulty in designing a compact and fully integrable version of the circuit using standard CMOS technologies [14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%