Abstract: A quadrature oscillator includes a first oscillator having a first second-order harmonic node, a second oscillator having a second second-order harmonic node, and at least one capacitor coupling the first second-order harmonic node and the second second-order harmonic node. The first oscillator is configured to supply an in-phase signal and the second oscillator is configured to supply a quadrature signal.

Abstract: An electronic device comprises first, second and third inductors connected in series and formed in a metal layer over a semiconductor substrate. The first and second inductors have a mutual inductance with each other. The second and third inductors having a mutual inductance with each other. A first capacitor has a first electrode connected to a first node. The first node is conductively coupled between the first and second inductors. A second capacitor has a second electrode connected to a second node. The second node is conductively coupled between the second and third inductors.

Abstract: A circuit includes an oscillator circuit including a first oscillator and a second oscillator. The first and the second oscillators are configured to generate signal having a same frequency and different phases. A transmission line is coupled between the first and the second oscillators.

Abstract: A filter auto-calibration system includes a multi-clock module. The multi-clock module includes a multi-clock generator that is configured to generate a clock signal with a variable frequency based on a channel setting. There is at least one filter to be calibrated. An auto-calibration control module is configured to control calibration of the at least one filter based on the channel setting. The multi-clock module is configured to supply the variable frequency clock signal to the at least one filter and to the auto-calibration control module, and the at least one filter is coupled to the auto-calibration control module.

Abstract: A quadrature oscillator includes a first oscillator having a first second-order harmonic node, a second oscillator having a second second-order harmonic node, and at least one capacitor coupling the first second-order harmonic node and the second second-order harmonic node. The first oscillator is configured to supply an in-phase signal and the second oscillator is configured to supply a quadrature signal.

Abstract: Apparatus for efficient time slicing including a phase lock loop circuit having a voltage controlled oscillator, an auto-frequency calibration circuit coupled with the phase lock loop circuit configured to output a value to select a range of the voltage controlled oscillator, and a burst mode detector connected with the auto-frequency calibration circuit. The burst mode detector having a register adapted to store the output of the auto-frequency calibration circuit.

Abstract: A hidden touch pad structure adapted for an electronic product includes a touch pad and a plate covering the touch pad. The plate includes a pad-recognizing portion corresponding to the touch pad. A circuit board is electronically connected to the touch pad for receiving a pressure signal when pressing the pad-recognizing portion of the plate.

Abstract: A hidden touch pad structure adapted for an electronic product has a plate, a touch pad arranged inside the plate, a circuit board disposed under and retained against the plate and the touch pad simultaneously, and a lighting device surrounding the touch pad and received inside the plate. The circuit board receives a pressure signal via the plate and the touch pad and drives the lighting device to provide light. The touch pad is recognized via the lighting device surrounding the touch pad.

Abstract: A hidden touch pad structure adopted for an electronic product is provided, which discloses a touch pad; a plate covering the touch pad, the plate having a pad-recognizing portion thereon corresponding to the touch pad; and a circuit board electronically connecting to the touch pad for receiving pressure signal when pressing the pad-recognizing portion of the plate.

Abstract: A hidden touch pad structure adopted for an electronic product has a plate, a touch pad arranged inside the plate, a circuit board disposed under and retained against the plate and the touch pad simultaneously, and a lighting device surrounding the touch pad and received inside the plate. The circuit board receives a pressure signal via the plate and the touch pad, and drives the lighting device to provide light. The touch pad is recognized via the lighting device surrounding thereof.

Abstract: The decorative multiple layered hat has multiple layers. The multiple layers are made of different materials, have different structures and features, are joined together sequentially to form a shape with a surface by different layers being exposed so the hat has an appealing appearance and raises people's interests and include an outer layer, a ventilative layer, a mesh layer, a fabric layer and an outer surface. The outer area has cutout areas. The ventilative layer is bonded to the outer area and has multiple perforations through which air flows. The mesh layer is a mesh through which air flows to keep a person's head cool and is bonded to the ventilative layer. The inner layer is bonded to the mesh layer, touches a person's skin and is a soft fabric so the hat is comfortable. The outer surface has patterns formed by the cutouts in the outer layer.

Abstract: A hidden touch pad structure adopted for an electronic product has a plate, a touch pad arranged inside the plate, a circuit board disposed under and retained against the plate and the touch pad simultaneously, and a lighting device surrounding the touch pad and received inside the plate. The circuit board receives a pressure signal via the plate and the touch pad, and drives the lighting device to provide light. The touch pad is recognized via the lighting device surrounding thereof.

Abstract: A locking device applies to a casing having a cover and a seat for opening and closing of the casing. The locking device has a recess formed on an edge of the seat, a buckle downwards protruding from the cover and matching the recess, and a roller parallel-disposed in the recess and pivoted to the seat. The buckle has an arcuate face smoothly against an upper slot of the roller for closing and opening the casing. A direction of lifting of the cover corresponds to a rotation of the roller so that a direction of applied force can be continuously unchanged to achieve an ergonomic effect.

Abstract: A hidden touch pad structure adopted for an electronic product has a plate, a touch pad arranged inside the plate, a circuit board disposed under and retained against the plate and the touch pad simultaneously, and a lighting device surrounding the touch pad and received inside the plate. The circuit board receives a pressure signal via the plate and the touch pad, and drives the lighting device to provide light. The touch pad is recognized via the lighting device surrounding thereof.

Abstract: A screen-pivoting structure is adopted for an electronic product with a base. The screen-pivoting structure has a pivoting unit arranged on an edge of the base of the electronic product, a frame unit having a bottom edge disposed on the pivoting unit along a horizontal direction, and a display with two opposite sides pivoting on the frame unit about a common predetermined axle of the frame unit. The display rotates about the common predetermined axle, the screen-pivoting structure can be module-manufactured, and the display is replaceable without changing the frame unit for meeting size requirements thereby.

Abstract: A dual-screen notebook computer is disclosed and has a notebook computer with an LCD display module, a pivot structure provided at one side of the notebook computer, and a supplementary display module fastened pivotally with the pivot structure and electrically connected to an internal control circuit of the notebook computer for output of current status information of the notebook computer.

Abstract: A locking device applies to a casing having a cover and a seat for opening and closing of the casing. The locking device has a recess formed on an edge of the seat, a buckle downwards protruding from the cover and matching the recess, and a roller parallel-disposed in the recess and pivoted to the seat. The buckle has an accurate face smoothly against an upper slot of the roller for closing and opening the casing. A direction of lifting of the cover corresponds to a rotation of the roller so that a direction of applied force can be continuously unchanged to achieve an ergonomic effect.