Design of a micropower signal conditioning circuit for a piezoresistive acceleration sensor

Arnaud, Alfredo; Barú, Marcelo; Picun, Gonzalo; Silveira, Fernando

doi:10.1109/iscas.1998.704364

Cited by 9 publications

(16 citation statements)

References 3 publications

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“…For the evaluation of the system in row (#1), the results in Table 4 The results are summarized in Table 5. Measurement results are consistent with a circuit adequate for inclusion in a high performance rate adaptive pacemaker [2,3].…”

Section: Filter Measurement Resultssupporting

confidence: 58%

“…An overall conclusion is that the system here presented improves the performance of previously designed activity sensing circuits in [3,18]. Its performance is also comparable to other high-end modern filters with similar specifications [19,20].…”

Section: Discussionsupporting

confidence: 62%

“…The first row relates to the activity sensing circuit here presented, including the bandpass amplifier, and rectifier-time average stage of Section 3.6. Row (#2) gives data from an activity sensing circuit using continuous-time techniques but requiring a large number of external components [3]. Row (#3) contains information on a switchedcapacitor filter, rectifier, and time averaging used for the same purpose, based on a piezoresistive accelerometer [18].…”

Section: Discussionmentioning

confidence: 99%

“…Unlike other circuit blocks, the acceleration sensor is always turned on in rate adaptive pacemakers, up to the end of battery life condition detection. Thus, activity sensing circuit must operate down to 2 V with a power consumption budget in the order of a µW [2,3]. In Table 2, a summary of specifications for the bandpass amplifier is given.…”

Section: The Sensing Element and System Specificationsmentioning

confidence: 99%

“…Modern cardiac pacemakers are nowadays complex electronic circuits performing several sensing, control, and stimulation functions [1,2] to reestablish a normal rhythm to a diseased heart. These functions may include cardiac sensing channels, cardiac stimuli, battery sensing, telemetry, and also physical activity sensing [1][2][3] the latter being the focus of this work. Physical activity sensing is a measurement used in the so-called adaptive pacemakers, which regulate the heart stimulation rate according to the requirements of the patient.…”

mentioning

confidence: 99%

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Fully integrated signal conditioning of an accelerometer for implantable pacemakers

Arnaud

Galup-Montoro

2006

Analog Integr Circ Sig Process

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This paper shows the development of a fully integrated G m -C 0.5-7 Hz bandpass amplifier (gain G = 400), for a piezoelectric accelerometer to be employed in rate adaptive pacemakers. The circuit, fabricated in a standard 0.8 micron CMOS technology, operates with a power supply as low as 2 V, consumes 230 nA of current, and has only a 2.1 µV rms input referred noise. Detailed circuit specifications, measurements, and a system performance comparative analysis are presented. The physical activity system includes a fully integrated G m -C rectifier and 3-second time average. Fully integrated very low frequency circuits were implemented with the aid of series-parallel current division in symmetrical OTAs. OTAs as low as 33 pS (equivalent to a 30 G resistor) were designed, fabricated, and tested.

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Section: Filter Measurement Resultssupporting

confidence: 58%

Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: The Sensing Element and System Specificationsmentioning

confidence: 99%

mentioning

confidence: 99%

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Fully integrated signal conditioning of an accelerometer for implantable pacemakers

Arnaud

Galup-Montoro

2006

Analog Integr Circ Sig Process

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Nano–power‐integrated precision rectifiers for implantable medical devices

Alvarez

Arnaud

Gak

et al. 2020

Circuit Theory & Apps

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Summary Two ultralow power CMOS full‐wave precision rectifiers aimed at analog signal processing in implantable medical devices are presented. The rectifiers require no diodes and utilize a single or two transconductors (operational transconductance amplifier [OTA]) as the active element, to reduce power consumption to a minimum. First, a voltage‐to‐current rectifier consuming only a 120‐nA supply current is presented and later is used to estimate the average AC amplitude of a piezoelectric accelerometer output (0.5–15‐Hz bandwidth) in an adaptive pacemaker. This rectifier is based on a linearized transconductor and a comparator to toggle the output current sign. Then, a novel voltage rectifier consuming less than 10 nA is presented based on a single nanopower OTA and a pass transistor and later is utilized in a pacemaker's cardiac sensing channel (60–200‐Hz bandwidth) circuit, incorporating the rectifier to detect positive and negative voltage signal spikes. Both rectifiers were designed in a 0.6‐μm CMOS technology, fabricated, and tested, and the measurement results closely fit the expected performance.

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Novel architecture for measurements in resistive MEMS sensors

Nandi¹,

Biswas²,

Dhar

et al. 2014

Meas. Sci. Technol.

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A low voltage, low power, resistive sensor architecture is proposed in this paper. The architecture is novel as it enhances the sensitivity along the main axis as well as reducing the impact of cross axes components. The proposed scheme also allows the simultaneous measurement of sensitivity along six different axes. With less than 15% of the power of its Wheatstone bridge [1] counterpart and with a voltage level as low as 2.25 V, this architecture also enables the realization of the sensor using fewer resistive elements. The modified sensor structure, along with the front-end signal processing circuit, is discussed.

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Design of a micropower signal conditioning circuit for a piezoresistive acceleration sensor

Cited by 9 publications

References 3 publications

Fully integrated signal conditioning of an accelerometer for implantable pacemakers

Fully integrated signal conditioning of an accelerometer for implantable pacemakers

Nano–power‐integrated precision rectifiers for implantable medical devices

Novel architecture for measurements in resistive MEMS sensors

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