An ota-based differential relaxation oscillator and its application as a versatile electronic interface for sensors

Muhammad Taher Abuelma'Atti; Muhammad Al-Salman

An ota-based differential relaxation oscillator and its application as a versatile electronic interface for sensors

Muhammad Taher Abuelma'Atti
, Muhammad Al-Salman

King Fahd University of Petroleum & Minerals

Research output: Contribution to specialist publication › Article

1 Scopus citations

Abstract

A differential relaxation oscillator circuit can operate as a capacitance-to-frequency or inductance-to-frequency converter. It can be used for capacitive/inductive sensor interface. When the differential input voltage of the operational transconductance amplifier (OTA) exceeds few millivolts, the output current will be equal to the input auxiliary bias current I_abc and will be either outward or inward. The circuit operation is started by assuming that the output current is outward. With the reference capacitor C _r and the sensor inductor L_s initially fully discharged, the capacitor will act as a short circuit and the inductor will act as an open circuit. Assuming that the output current of the OTA is outward, the two capacitors will start charging processes heading towards I_abcR _r with a time constant = C_rR_r for the reference capacitor, and towards I_abcR_s for the sensor capacitor with a time constant = C_sR_s.

Original language	English
Pages	43
Number of pages	1
Volume	115
No	1881
Specialist publication	Electronics World
State	Published - Sep 2009

ASJC Scopus subject areas

Electrical and Electronic Engineering

Cite this

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abstract = "A differential relaxation oscillator circuit can operate as a capacitance-to-frequency or inductance-to-frequency converter. It can be used for capacitive/inductive sensor interface. When the differential input voltage of the operational transconductance amplifier (OTA) exceeds few millivolts, the output current will be equal to the input auxiliary bias current Iabc and will be either outward or inward. The circuit operation is started by assuming that the output current is outward. With the reference capacitor C r and the sensor inductor Ls initially fully discharged, the capacitor will act as a short circuit and the inductor will act as an open circuit. Assuming that the output current of the OTA is outward, the two capacitors will start charging processes heading towards IabcR r with a time constant = CrRr for the reference capacitor, and towards IabcRs for the sensor capacitor with a time constant = CsRs.",

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An ota-based differential relaxation oscillator and its application as a versatile electronic interface for sensors

Abstract

ASJC Scopus subject areas

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