A low power interface circuit for resistive sensors with digital offset compensation

Boujamaa, El Mehdi; Alandry, Boris; Hacine, Souha; Latorre, Laurent; Mailly, F.; Nouet, Pascal

doi:10.1109/iscas.2010.5537970

Cited by 24 publications

(14 citation statements)

References 5 publications

(5 reference statements)

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“…Also the nonlinear circuit designed in this work combines with the nonlinearity of the actuator and produces a linear input-output relationship. However the interface circuits designed in [10], [20], [36] are linear readout front-ends which are not suitable for this application.…”

Section: Experiments and Discussionmentioning

confidence: 99%

Frequency Modulation Technique for MEMS Resistive Sensing

2012

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Abstract-Frequency modulation technique can be applied to microelectromechanical systems (MEMS) transducers that require some form of resistive sensing. For example, electrothermal sensing is being investigated as a viable means of measuring displacement in micromachined transducers. This paper proposes a highly sensitive readout circuit, which can convert 10 change of resistance in a 400 electrothermal sensor to more than 200 kHz frequency variation (350-550 KHz). The frequency variations are then converted to voltage values by means of a frequency demodulation. In addition, the proposed technique achieves high linearity from the voltage applied to the actuator to the voltage measured at the sensor's output, which can potentially eliminate the need for an additional linearization if the sensor is used in a feedback loop. The proposed approach leads to high sensitivity in the MEMS electrothermal sensing since the method is not affected by amplitude variations that could arise from the readout circuit.

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Section: Experiments and Discussionmentioning

confidence: 99%

Frequency Modulation Technique for MEMS Resistive Sensing

2012

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“…They offer several key advantages including mechanical robustness due to the non-contact measurement principle, a very wide operating temperature range and low manufacturing costs [1]. AMR sensors are typically implemented with two Wheatstone bridges to optimize the output voltage and because of their immunity to environmental disturbances [2] . However, an undesirable effect is an output voltage even if all bridge resistances sense the same angle.…”

Section: Introductionmentioning

confidence: 99%

Determination of the aging offset voltage of AMR sensors based on accelerated degradation test

Zambrano

Kerkhoff

2015

2015 IEEE 20th International Mixed-Signals Testing Workshop (IMSTW)

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Usually Anisotropic Magnetoresistance angle sensors are configured with two Wheatstone bridges, but an undesirable offset voltage included in the sensor output affects its accuracy. The total offset voltage combines a voltage due to resistance mismatches during manufacturing and a voltage from inequalities in the magnetic sensitivity. This paper focuses on identifying a consistent trend between the bridges' offset voltages. Compared with previous studies that focus on lifetime tests using high temperatures, this research uses temperature cycling to study offset voltage and sensitivity variations due to aging effects.A consistent trend between the bridges' offset voltages could not be found. The two offset components can add to or subtract from each other and their interaction can change over time due to variations in the sensor's material properties. To achieve a precise angle measurement, the offset voltage must be compensated continuously over the entire sensor lifetime.

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“…The transducer's offset voltage caused by the fabrication spread of the piezoresistors forces the addition of offset compensation circuits [2,3] in order to avoid the saturation of the amplification stages when very weak input signals are amplified.…”

Section: Introductionmentioning

confidence: 99%

A low-power interface circuit for piezoresistive transducers

Donida

Barrettino

2015

2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings

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This paper presents the design and development of a low-power interface circuit for piezoresistive transducers. This circuit combines the chopping technique with the correlated double sampling (CDS) technique in order to eliminate both the amplifier offset and the chopper ripple at the sampling frequency. In addition, programmable current sources compensate for the transducer offset and the low frequency components coming from environmental conditions thus allowing the readout of very weak input signals with high resolution (0.45µV) at a total power consumption of 200 µW.

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A low power interface circuit for resistive sensors with digital offset compensation

Cited by 24 publications

References 5 publications

Frequency Modulation Technique for MEMS Resistive Sensing

Frequency Modulation Technique for MEMS Resistive Sensing

Determination of the aging offset voltage of AMR sensors based on accelerated degradation test

A low-power interface circuit for piezoresistive transducers

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