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: Embodiments include methods, systems, and apparatuses capable of dynamically and adaptively operating on wideband signals. Examples include state variable filters whose center frequencies can be tuned using variable gain blocks coupled to outputs of filter integrators. First- and second-order state variable filters may operate on signals in parallel and their outputs combined to produce a filtered output. Filters may be tuned to pass or reject signals depending on the application; sample applications include, but are not limited to: agile filtering; spectrum analysis; interference detection and rejection; equalization; direct intermediate-frequency transmission; and single-sideband modulation and demodulation.

Abstract: Embodiments include methods, systems, and apparatuses capable of dynamically and adaptively operating on wideband signals. Examples include state variable filters whose center frequencies can be tuned using variable gain blocks coupled to outputs of filter integrators. First- and second-order state variable filters may operate on signals in parallel and their outputs combined to produce a filtered output. Filters may be tuned to pass or reject signals depending on the application; sample applications include, but are not limited to: agile filtering; spectrum analysis; interference detection and rejection; equalization; direct intermediate-frequency transmission; and single-sideband modulation and demodulation.