Error elimination amplifier and moter control circuit using the same

A motor control circuit, comprising:

• a processing circuit;
• a speed signal generation circuit, electrically connected to the processing circuit;
• a Hall sensor, electrically connected to the processing circuit, detecting a variation of an external magnetic field to generate a Hall sensing signal;
• and
• an error elimination amplifier, including:
• an amplification circuit, including a first signal input end, a second signal input end and a signal output end, wherein the first signal input end and the second signal input end respectively receive the Hall sensing signal;
• a switching circuit, electrically connected to the signal output end of the amplification circuit;
• a comparison circuit, including:
• a first comparator, having a first input end, a second input end and an output end, wherein the first input end of the first comparator is electrically connected to the signal output end of the amplification circuit;
• and
• a second comparator, having a first input end, a second input end and an output end, wherein the first input end of the second comparator is electrically connected to the signal output end of the amplification circuit;
• an output comparator, having a first input end, a second input end and an output end, wherein the first input end of the output comparator is electrically connected to the signal output end of the amplification circuit, and the second input end of the output comparator is coupled to a reference voltage;
• and
• a calibration circuit, electrically connected to the amplification circuit;
• wherein an offset of the Hall sensing signal is eliminated through the amplification circuit, the switching circuit and the calibration circuit;
• wherein the calibration circuit adjusts a base voltage of the Hall sensing signal based on a predetermined calibration unit to eliminate the offset of the Hall sensing signal.