Patent ID: 6786088
Filing Date: 2004-09-07
Classification: G01F

Abstract:
An apparatus for measuring a gas flow rate, which includes one or a plurality of first resistors arranged in a gas passage, and a gas flow rate detection circuit for outputting a gas flow rate detection signal representative of a gas flow rate in the gas passages, by detecting one of currents flowing through the first resistors and voltages generated in accordance with said currents, said apparatus comprising:a fixed resistor connected in series to one of the first resistors; and a first A/D converter circuit for converting an input voltage into a digital signal based on a reference voltage and outputting the digital signal; wherein, a voltage generated in said fixed resistor is used as the reference voltage; a voltage generated in a combined resistance of the first resistor and said fixed resistor is used as the input voltage; and a digital output signal of a gas temperature signal is obtained by said first A/D converter circuit.