Detail publikace

CMOS Current Feedback Operational Amplifier-Based Relaxation Generator for Capacity to Voltage Sensor Interface

POLÁK, L. ŠOTNER, R. PETRŽELA, J. JEŘÁBEK, J.

Originální název

CMOS Current Feedback Operational Amplifier-Based Relaxation Generator for Capacity to Voltage Sensor Interface

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

This paper presents a simple relaxation generator, suitable for a sensor interface, operating as a transducer of capacitance to frequency/period. The proposed circuit employs a current feedback operational amplifier, fabricated in I3T25 0.35 μ m ON Semiconductor CMOS process, and four passive elements including a grounded capacitor (the sensed parameter). It offers a low-impedance voltage output of the generated square wave. Additional frequency to DC voltage converter offers output information in the form of voltage. The experimental capacitance variation from 6.8 nF to 100 nF yields voltage change in the range from 21 mV to 106 mV with error below 5% and sensitivity 0.912 mV/nF evaluated over the full range of change. These values are in good agreement with simulation results obtained from the Mathcad model of frequency to DC voltage transducer passive circuit.

Klíčová slova

capacity sensor interface; capacity measurement; current feedback operational amplifier; relaxation generator; square wave generator

Autoři

POLÁK, L.; ŠOTNER, R.; PETRŽELA, J.; JEŘÁBEK, J.

Vydáno

18. 12. 2018

Nakladatel

MDPI

Místo

Basel (Switzerland)

ISSN

1424-8220

Periodikum

SENSORS

Ročník

18

Číslo

12

Stát

Švýcarská konfederace

Strany od

1

Strany do

15

Strany počet

15

URL

https://www.mdpi.com/1424-8220/18/12/4488

Plný text v Digitální knihovně

http://hdl.handle.net/11012/179678

BibTex

@article{BUT151967,
  author="Ladislav {Polák} and Roman {Šotner} and Jiří {Petržela} and Jan {Jeřábek}",
  title="CMOS Current Feedback Operational Amplifier-Based Relaxation Generator for Capacity to Voltage Sensor Interface",
  journal="SENSORS",
  year="2018",
  volume="18",
  number="12",
  pages="1--15",
  doi="10.3390/s18124488",
  issn="1424-8220",
  url="https://www.mdpi.com/1424-8220/18/12/4488"
}