OPTIMIZED CONVECTION BASED MASS AIRFLOW SENSOR CIRCUIT

摘要

A method and apparatus for measuring the amount of flow of a flowing medium. The method and apparatus include a bridge circuit (20) configured to develop a bridge voltage Vb such that the magnitude of the bridge voltage Vb is indicative of the amount of flow. The bridge circuit (20) is configured without having an ambient temperature sensor, thus the bridge voltage is uncompensated with respect to ambient temperature. A thermistor circuit (54) is configured to generate a temperature reference voltage (56) indicative of ambient temperature. A conditioning circuit (50) is configured to receive the uncompensated bridge voltage and the temperature reference voltage (56) to process the same and generate a compensated bridge voltage with respect to ambient temperature. The compensated bridge voltage is indicative of fluid flow.