Patent ID: 9513348
Filing Date: 2016-12-06
CPC Classification: G01R

Claim Text:
1. A Hall electromotive force signal detection circuit configured to select a terminal position for applying a drive current to a Hall element including a plurality of terminals and detect a Hall electromotive force signal voltage, the Hall electromotive force signal detection circuit comprising: one Hall element including one set of first to fourth terminals, for generating a Hall electromotive force signal voltage; another Hall element including another set of first to fourth terminals, for generating another Hall electromotive force signal voltage; a first switching circuit for selecting a terminal position for applying a drive current from the first to fourth terminals of the one Hall element; a second switching circuit for selecting a terminal position for applying a drive current from the first to fourth terminals of the another Hall element, the terminal position selected by the second switching circuit being different from the terminal position selected by the first switching circuit; a chopper clock generation circuit for supplying a chopper clock signal to the first switching circuit and the second switching circuit; and a Hall electromotive force signal addition circuit for simultaneously adding the Hall electromotive force signal voltage and the another Hall electromotive force signal voltage, wherein a layout of the Hall electromotive force signal detection circuit is that the one Hall element and the another Hall element are arranged in parallel and adjacent to each other, wherein the first switching circuit switches the terminal position for applying the drive current in the one Hall element between the first terminal and the second terminal of the one Hall element based on the chopper clock signal generated by the chopper clock generation circuit, wherein the second switching circuit switches the terminal position for applying the drive current in the another Hall element between the fourth terminal and the third terminal of the another Hall element based on the chopper clock signal generated by the chopper clock generation circuit, wherein the chopper clock generation circuit is a circuit for supplying the chopper clock signal having two different phases, to the first switching circuit and the second switching circuit, wherein, in the first switching circuit, the drive current is applied from the first terminal by electrifying the first terminal and the third terminal when the chopper clock signal is in one of the two phases, and the drive current is applied from the second terminal by electrifying the second terminal and the fourth terminal when the chopper clock signal is in another one of the two phases, wherein, in the second switching circuit, the drive current is applied from the fourth terminal by electrifying the second terminal and the fourth terminal when the chopper clock signal is in the one of the two phases and the drive current is applied from the third terminal by electrifying the third terminal and the first terminal when the chopper clock signal is in the another one of the two phases, wherein the first switching circuit measures electric potential of the second terminal with respect to the fourth terminal of the one Hall element and the second switching circuit measures electric potential of the first terminal with respect to the third terminal of the another Hall element in the one of the two phases, and wherein the first switching circuit measures electric potential of the first terminal with respect to the third terminal of the one Hall element and the second switching circuit measures electric potential of the second terminal with respect to the fourth terminal of the another Hall element in the another one of the two phases.