Patent ID: 8624847
Filing Date: 2014-01-07
Classification: G06F

Abstract:
1. A transducer for use in a position sensor, the transducer comprising a single laminate sensor board carrying: a plurality of windings formed by conductors on one or more layers of the sensor board, the windings being arrayed over a first area of the sensor board; and detection circuitry mounted on another layer of the sensor board over a second area of the circuit board and electrically coupled to said windings, said detection circuitry having a first mode of operation in which signals inductively transmitted from or received by said windings are detected and a second mode of operation in which signals capacitively transmitted from or received by said windings are detected, wherein said windings and said detection circuitry are arranged on said sensor board so that said first and second areas oppose each other; wherein said sensor board comprises a conductor plane positioned in a layer different from the one or more layers in which said windings are arrayed and between the plurality of windings and said detection circuitry to reduce noise when said detection circuitry is operating in said second mode of operation; and wherein said conductor plane is formed from a plurality of interconnected conductive islands to reduce eddy current noise when said detection circuitry is operating in said first mode of operation.