Title :
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
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;
Conference_Titel :
Solid-State Circuits Conference, 1992. ESSCIRC '92. Eighteenth European
Conference_Location :
Copenhagen
Print_ISBN :
87-984232-0-7
DOI :
10.1109/ESSCIRC.1992.5468136
