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Title: A 16-{micro}A interface circuit for a capacitive flow sensor

Abstract

A micropower interface circuit is described for fluidic flow measurement in commercial gas meters. The application-specific integrated circuit converts dynamic capacitive-flow sensor readings from 1 to 150 Hz into digital pulses suitable for reading by the host microcontroller. The signal path is first-order {Delta}{Sigma} modulation followed by a three-pole, one-zero infinite impulse response bandpass filter. Analog signal processing is fully differential switched capacitor, with amplifiers and dc current consuming blocks operating in weak inversion. Chip bias and oscillator frequency, and capacitive sensor offset and gain, are trimmed with on-chip EEPROM. Operating ranges are 2.5--3.6 V and from {minus}10 to 65 C, with active I{sub dd} of 16 {micro}A.

Authors:
;  [1];  [2]; ;  [3]
  1. Integrated Sensor Solutions, San Jose, CA (United States)
  2. Marvell Semiconductor, Sunnyvale, CA (United States)
  3. Nagano Keiki Co., Ltd. (Japan)
Publication Date:
OSTI Identifier:
343671
Resource Type:
Journal Article
Journal Name:
IEEE Journal of Solid-State Circuits
Additional Journal Information:
Journal Volume: 33; Journal Issue: 12; Other Information: PBD: Dec 1998
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; GAS METERS; ANALOG-TO-DIGITAL CONVERTERS; TRANSDUCERS; DIGITAL FILTERS; INTEGRATED CIRCUITS

Citation Formats

Rodgers, B, Yunus, M, Goenawan, S, Kaneko, Yoshikazu, and Yoshiike, Junichi. A 16-{micro}A interface circuit for a capacitive flow sensor. United States: N. p., 1998. Web. doi:10.1109/4.735555.
Rodgers, B, Yunus, M, Goenawan, S, Kaneko, Yoshikazu, & Yoshiike, Junichi. A 16-{micro}A interface circuit for a capacitive flow sensor. United States. https://doi.org/10.1109/4.735555
Rodgers, B, Yunus, M, Goenawan, S, Kaneko, Yoshikazu, and Yoshiike, Junichi. 1998. "A 16-{micro}A interface circuit for a capacitive flow sensor". United States. https://doi.org/10.1109/4.735555.
@article{osti_343671,
title = {A 16-{micro}A interface circuit for a capacitive flow sensor},
author = {Rodgers, B and Yunus, M and Goenawan, S and Kaneko, Yoshikazu and Yoshiike, Junichi},
abstractNote = {A micropower interface circuit is described for fluidic flow measurement in commercial gas meters. The application-specific integrated circuit converts dynamic capacitive-flow sensor readings from 1 to 150 Hz into digital pulses suitable for reading by the host microcontroller. The signal path is first-order {Delta}{Sigma} modulation followed by a three-pole, one-zero infinite impulse response bandpass filter. Analog signal processing is fully differential switched capacitor, with amplifiers and dc current consuming blocks operating in weak inversion. Chip bias and oscillator frequency, and capacitive sensor offset and gain, are trimmed with on-chip EEPROM. Operating ranges are 2.5--3.6 V and from {minus}10 to 65 C, with active I{sub dd} of 16 {micro}A.},
doi = {10.1109/4.735555},
url = {https://www.osti.gov/biblio/343671}, journal = {IEEE Journal of Solid-State Circuits},
number = 12,
volume = 33,
place = {United States},
year = {Tue Dec 01 00:00:00 EST 1998},
month = {Tue Dec 01 00:00:00 EST 1998}
}