Balanced magnetoresistive frequency mixer

A balanced magnetoresistive frequency mixer, comprising:

• a spiral coil;
• a balanced magnetoresistive sensor bridge;
• and
• a magnetic shielding layer,
• wherein the spiral coil is located between the magnetic shielding layer and the balanced magnetoresistive sensor bridge,
• wherein the spiral coil comprises a first spiral coil and a second spiral coil, an upper surface or a lower surface of the first spiral coil has a first sub region and a second sub region in which the current flows in opposite directions, and an upper surface or a lower surface of the second spiral coil has a third sub region in which the current flows in one direction,
• wherein the balanced magnetoresistive sensor bridge comprises a magnetoresistive full bridge and a balancing magnetoresistive arm connected to the magnetoresistive full bridge, the magnetoresistive full bridge consists of four magnetoresistive bridge arms, two of which are located in the first sub region and the other two are located in the second sub region, and the balancing magnetoresistive arm is located in the third sub region,
• wherein a first frequency signal is input into the first spiral coil (40), a second frequency signal is input into the second spiral coil, and a frequency-mixed signal is output from a signal output end of the magnetoresistive full bridge, wherein the output frequency of the frequency-mixed signal is a sum of or a difference between the frequencies of the first frequency signal and the second frequency signal.