Patent ID: 8733179

Claim:
A flow meter with digital temperature compensation, comprising: an operational amplifier A, a digital potentiometer R W , a sensor coil R coil , and fixed resistors R 1 , R 2 and R 3 ; wherein: one end of the sensor coil R coil is connected to the non-inverting input terminal of the operational amplifier A, the other end is grounded, the fixed resistor R 1 , is connected between the non-inverting input terminal and the output terminal of operational amplifier A, the inverting input terminal of the operational amplifier A is connected to one end of the fixed resistors R 2 and one end of fixed resistor R 3 , the other end of the fixed resistors R 2 is connected to the output terminal of the operational amplifier A, and the other end of the fixed resistor R 3 is grounded, the connecting end of the fixed resistor R 2 and the output terminal of the operational amplifier A is connected with the high-side terminal of the digital potentiometer R W , the grounded end of the fixed resistor R 3 is connected with the low-side terminal of the digital potentiometer R W , and the inverting input terminal of the operational amplifier A is connected with the sliding end of the digital potentiometer R w .