Bridge-to-Frequency Converter for Smart Thermal Flow-Sensor

Author

Van Dijk, Gert J A ; Huijsing, Johan H.

Author_Institution

Dept. of Electr. Eng., Delft Univ. of Technol., Delft, Netherlands

fYear

1992

fDate

21-23 Sept. 1992

Firstpage

347

Lastpage

350

Abstract

A fully integrated bridge-to-frequency converter is presented as signal-conditioning circuitry for a one-chip smart thermal flow sensor. The converter reads out four separate bridges by means of a multiplexer to realize high sensitivity and directional flow measurement over the full range of 360°. Multiplexer control and output signal are microprocessor compatible. The relative measurement cancels all linear errors. The centre frequency is 10kHz. The sensitivity is 1Hz/(μV/V). A bridge-offset of 10mV/V is allowed. The linearity error is 0.1%. The supply voltage is 5V.

Keywords

bridge instruments; flow sensors; frequency convertors; intelligent sensors; measurement errors; microprocessor chips; signal conditioning circuits; signal processing equipment; thermal variables measurement; bridge-to-frequency converter; directional flow measurement; frequency 10 kHz; linear error; microprocessor; multiplexer; one chip smart thermal flow sensor; signal conditioning circuit; voltage 5 V; Bridge circuits; Fluid flow measurement; Frequency; Integrated circuit measurements; Intelligent sensors; Linearity; Microprocessors; Multiplexing; Thermal sensors; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 1992. ESSCIRC '92. Eighteenth European

Conference_Location

Copenhagen

Print_ISBN

87-984232-0-7

Type

conf

DOI

10.1109/ESSCIRC.1992.5468136

Filename

5468136