Patent ID: 8358129

Claim:
A signal transmitting device comprising: a first conductor configured to generate a first magnetic field in accordance with an input signal; a second conductor configured to generate a second magnetic field in accordance with a bias signal; a first magneto-resistive element having a magnetic resistance increased by the first magnetic field and decreased by the second magnetic field; a second magneto-resistive element having a magnetic resistance decreased by the first magnetic field and increased by the second magnetic field; and an output circuit configured to compare a voltage varying in accordance with a difference between the magnetic resistance of the first magneto-resistive element and the magnetic resistance of the second magneto-resistive element, a first threshold value, and a second threshold value greater than the first threshold value and output an output signal having a first logical value when the voltage is smaller than the first threshold value and output an output signal having a second logical value when the voltage is greater than the second threshold value, wherein intensities and directions of the respective first and second magnetic fields are adjusted such that the voltage is smaller than the first threshold value when the input signal is zero.