Abstract: A fingerprint authentication system includes a fingerprint imaging sensor and a spoof detector sensor. The fingerprint imaging sensor includes a two-dimensional array of ultrasonic transducers, where the fingerprint imaging sensor is for capturing an image of a fingerprint of a finger. The spoof detector sensor includes at least one ultrasonic transducer, where the spoof detector sensor is for capturing data used to determine whether the finger is a real finger. A contact layer overlies the fingerprint imaging sensor and the spoof detector sensor, where the contact layer for receiving the finger of a user. A processor of the fingerprint authentication system is configured to perform a user authentication operation using the fingerprint imaging sensor and the spoof detector sensor, where the user authentication operation is for authenticating a user using a single touch action.

Abstract: A proximity detection system includes a magnetic field generator for generating a rotating magnetic field having a decreasing intensity over an increasing separation distance, and a magnetic field detector being relatively movable and generating a crossing indication based upon an intensity threshold in the rotating magnetic field being crossed as a threshold separation distance from the magnetic field generator is crossed. The system may also include a transmitter for transmitting a signal relating to the crossing indication from the magnetic field detector. The magnetic field generator may generate a substantially constant amplitude rotating magnetic field vector, and the magnetic field detector may comprise a plurality of orthogonal detection coils. The rotating magnetic field provides a relatively sharp cut-off threshold separation distance defining a perimeter for proximity detection.