Circuit structure for reading orthogonal rotating current of Hall sensor
A Hall sensor and circuit structure technology, applied in logic circuits, electrical components, reliability improvement and modification, etc., can solve problems such as sensor signal interference, offset voltage cancellation, amplifier offset and noise
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[0010] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:
[0011] Such as image 3 As shown, a circuit structure for orthogonal rotating current readout of a Hall sensor includes a constant current source 101, two PMOS switches (102, 103), and six NMOS switches (104, 105, 106, 107, 108). , 109), an amplifier 113 and a square Hall plate 110, and the ground 111, 112 are the equivalent input offset and noise source of the amplifier 113 (defined as VOSA). The said eight MOS switches need to provide two-phase non-overlapping clocks for the selection operation of the switches. The square Hall plate 110 has a terminal at its four corners, which is connected with two PMOS switches (102, 103) and two NMOS switches (104, 105). ) Are connected to each other, the constant current source 101 is connected to the other end of the two PMOS switches (102, 103), and the current is injected from it into the square Hall plate 1...
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