Abstract: A delay circuit is coupled to an electromagnetic coil and includes a power input end coupled to a first end of the electromagnetic coil, a first switch module coupled to the power input end, a second switch module coupled to a second end of the electromagnetic coil, a first timing module coupled to the power input end and the first switch module, and a second timing module coupled to the power input end and the second switch module. The second switch module turns on when the power input end supplies power. The first timing module is configured to count time when the power input end supplies power and turns on the first switch module after a first predetermined time. The second timing module is configured to count time after the first switch module turns on and turns on the second switch module after a second predetermined time.

Abstract: A voltage regulator, an operation method thereof, and a voltage regulating system, and a mobile vehicle are provided. The voltage regulator coupled to an alternator and a battery includes a voltage detection unit which is coupled to the alternator and a startup assisting unit. The voltage detection unit operatively generates an enable signal responsive to an output voltage of the alternator. The startup assisting unit is coupled to the alternator, the battery, and the voltage detection unit. The startup assisting unit operatively generates a first exciting current to excite a rotor coil according to the enable signal. When the voltage detection unit detects that the output voltage is greater than a predetermined voltage threshold, the voltage detection unit outputs the enable signal causing the startup assisting unit to generate the first exciting current to the rotor coil, thereby facilitating the alternator to establish voltage under low rotational speed.

Abstract: An angle-adjustable support includes a base, a carrier and a pivot mechanism. The base includes a sidewall and a bottom. The sidewall has a first pivot and a second pivot. The pivot mechanism pivotally connects the carrier with the base. The pivot mechanism has three working states. The carrier is locked when the pivot mechanism works in a first working state. The carrier is capable of pivoting relative to the base in a clockwise or anticlockwise when the pivot mechanism works in a second working state. The carrier is free to rotate when the pivot mechanism works in a third working state.

Abstract: A radio frequency (RF) power amplifier is disclosed. The RF power amplifier includes an adder circuit, an output-stage circuit and a differential circuit. The adder circuit has a first ratio and a second ratio, and receives a reference voltage and a feedback voltage so as to output an adder voltage after an operation, wherein the feedback voltage is a voltage with a negative temperature coefficient, and the reference voltage is sum of a first voltage with a negative temperature coefficient and a second voltage with positive temperature coefficient. The output-stage circuit is used for providing the feedback voltage. The differential circuit has a first multiplier factor, and the differential circuit makes the first multiplier factor be multiplied with the adder voltage so as to provide a voltage to the output-stage circuit. The RF power amplifier stabilizes an output current through adjusting the temperature coefficient of the reference voltage.

Abstract: A composite stylus retaining structure for an electronic device is provided. The composite stylus retaining structure includes a stylus and a housing. The stylus includes a body, a head and a connecting rod. The housing includes a first wall and a second wall connected to each other, and a first receiving groove and a second receiving groove are formed at an intersection of the first wall and the second wall. The first receiving groove is used to receive the head. A retaining member is disposed in the first receiving groove to retain the stylus. The second receiving groove is used to receive the head of the stylus.

Abstract: A radio frequency (RF) power amplifier is disclosed. The RF radio power amplifier includes a bias current generating unit, a first impedance unit, a second impedance unit, a third impedance unit and an output stage unit. The bias current generating unit receives a reference voltage. There is a first voltage with negative temperature coefficient between the first impedance unit and the second impedance unit, and the second unit receives a ground current. There is a second voltage between the third impedance unit and the second impedance unit, and the second voltage is a partial voltage of the first voltage. The bias current generating unit outputs a bias current with positive temperature coefficient according to the second voltage. The output stage unit receives an input current. The bias current is a sum of the input current with positive temperature coefficient and the ground current.

Abstract: An electromagnetic interference (EMI) shielding structure, which includes: a substrate, at least one chip unit, a packing layer, and an EMI shielding unit. The chip unit is disposed on the surface of the substrate and electrically coupled thereto. The packing layer is formed on the substrate and covers the chip unit. The EMI shielding unit includes: a first, second, and third shielding layer. The first shielding layer covers the outer surface of the packing layer and the lateral surface of the substrate. The second and third shielding layer respectively covers the outer surface of the first and second shielding layer. Based on the instant disclosure, the EMI shielding unit uses the methods of sputtering and electroless plating, to increase the adhesion strength of the EMI shielding unit and make the thickness of the shielding layer uniform. The instant disclosure raises the EMI shielding efficiency and lowers the manufacturing cost.

Abstract: The instant disclosure relates to an angle adjustable device, which includes: a base having a fixing member disposed thereon, where the fixing member has a fixing surface; a switch mechanism having a locking ring, a first gear, and a second gear, while at least one block protrudes from the inner surface of the locking ring, with the first gear having a contact incline slidingly abutted by the block, where the contact incline is defined with a first end and a second end, where the first gear is received by the locking ring and capable of meshing with the second gear; and a rotator having at least one connecting member connected to the second gear. The instant disclosure also discloses an electronic display unit using the same.

Abstract: A radio frequency (RF) power amplifier is disclosed. The power amplifier includes an output stage circuit, an exponential type bias circuit and a voltage-current transformation circuit. The output stage circuit receives a first system voltage and outputs an output current. The exponential type bias circuit receives a bias current, wherein a relationship between the bias current and output current is exponential, and when the bias current is zero current, and the output current is zero current. The voltage-current transformation circuit transforms the first system voltage into a second current so that the bias current is in proportion to the first system voltage, and thus the relationship between the output current and the first system voltage is exponential. The bias current is equal to times of the sum of the first current and the second current.

Abstract: The instant disclosure provides a self-sealed stacked structure which includes a substrate unit, a first frame, a conductive unit and a blocker unit. The substrate unit includes a first and a second substrate, and a first frame sandwiched there-between. The conductive unit includes a plurality of first conductors and second conductors electrically connecting the first substrate, the first frame and the second substrate. The first and the second conductors are in electrical connection. A blocker unit including at least two first and at least two second blockers are surroundingly arranged around the plurality of first and second conductors, respectively. The first substrate and the first frame are connected in a sealed manner through the first blockers combined by the solder, where the first frame and the second substrate are connected in a sealed manner through the second blockers combined by the solder.

Abstract: An electronic device case includes a first shell, a second shell, and a side button. The first and second shells are each provided with a peripheral side plate. A passage communicating the inside and outside of the case, a first restriction slot extending from the passage toward the first shell, and a second restriction slot extending from the passage toward the second shell are formed jointly by the peripheral side plates of the shells embedded with each other. The side button is provided with a base and a press portion protruding from the base. The thickness of the base is larger than or equal to the widths of the restriction slots. The side button is installed in the passage with the base embedded in the restriction slots. As a result, the case is sufficiently water resistant, firm in structure and easy to assemble.

Abstract: A radio frequency (RF) power amplifier is disclosed. The power amplifier includes an output stage circuit, an exponential type bias circuit and a voltage-current transformation circuit. The output stage circuit receives a first system voltage and outputs an output current. The exponential type bias circuit receives a bias current, wherein a relationship between the bias current and output current is exponential, and when the bias current is zero current, and the output current is zero current. The voltage-current transformation circuit transforms the first system voltage into a second current so that the bias current is in proportion to the first system voltage, and thus the relationship between the output current and the first system voltage is exponential. The bias current is equal to times of the sum of the first current and the second current.

Abstract: A machine-implemented method for data conversion, which is adapted for converting a plurality of entries of component data in a bill of materials, includes the steps of: (a) reading the entries of the component data from the bill of materials; (b) acquiring a critical text set from each of the entries of the component data; (c) generating a converted component value and a converted component value range for the critical text set acquired from each of the entries of the component data; and (d) rearranging the entries of the component data in the bill of materials according to the converted component values, and displaying the rearranged entries of the component data together with the corresponding converted component values and the corresponding converted component value ranges.

Abstract: A radio frequency (RF) power amplifier is disclosed. The RF power amplifier includes an adder circuit, an output-stage circuit and a differential circuit. The adder circuit has a first ratio and a second ratio, and receives a reference voltage and a feedback voltage so as to output an adder voltage after an operation, wherein the feedback voltage is a voltage with a negative temperature coefficient, and the reference voltage is sum of a first voltage with a negative temperature coefficient and a second voltage with positive temperature coefficient. The output-stage circuit is used for providing the feedback voltage. The differential circuit has a first multiplier factor, and the differential circuit makes the first multiplier factor be multiplied with the adder voltage so as to provide a voltage to the output-stage circuit. The RF power amplifier stabilizes an output current through adjusting the temperature coefficient of the reference voltage.

Abstract: A package structure comprises a substrate, a plurality of first electronic components, at least a second electronic component, a first covering layer and a wiring layer. A surface of the substrate includes a first region and a second region. The first electronic components are disposed in the first region, wherein at least one of the first electronic components has a first conductive contact. The second electronic component is disposed in the second region. The first covering layer includes a recess and a first exposing region for exposing the first conductive contact. The wiring layer is formed on the recess and electronically coupled to the first conductive contact.

Abstract: An electronic device case includes a first shell, a second shell, and a side button. The first and second shells are each provided with a peripheral side plate. A passage communicating the inside and outside of the case, a first restriction slot extending from the passage toward the first shell, and a second restriction slot extending from the passage toward the second shell are formed jointly by the peripheral side plates of the shells embedded with each other. The side button is provided with a base and a press portion protruding from the base. The thickness of the base is larger than or equal to the widths of the restriction slots. The side button is installed in the passage with the base embedded in the restriction slots. As a result, the case is sufficiently water resistant, firm in structure and easy to assemble.

Abstract: A radio frequency (RF) power amplifier is disclosed. The RF radio power amplifier includes a bias current generating unit, a first impedance unit, a second impedance unit, a third impedance unit and an output stage unit. The bias current generating unit receives a reference voltage. There is a first voltage with negative temperature coefficient between the first impedance unit and the second impedance unit, and the second unit receives a ground current. There is a second voltage between the third impedance unit and the second impedance unit, and the second voltage is a partial voltage of the first voltage. The bias current generating unit outputs a bias current with positive temperature coefficient according to the second voltage. The output stage unit receives an input current. The bias current is a sum of the input current with positive temperature coefficient and the ground current.

Abstract: A structure for transmitting signals of PCI express and a method thereof provides a converting device and a high-definition multimedia interface (HDMI) cable. The converting device has a plug connector to into a PCI express slot, along with a HDMI connector. The signal converting circuit connects the signal pins of the PCI express slot to the signal pins of HDMI connector. One end of the HDMI cable is connected with the HDMI connector of the converting device. The present invention can extends the signal distance of the PCI express to exactly perform the signal test.

Abstract: A system in package (SiP) module includes a first circuit board assembly, a second circuit board assembly and a plurality of metallic pillars. The first circuit board assembly has a first top surface, a first bottom surface and a plurality of pads mounted on the first bottom surface. The second circuit board assembly has a second top surface, a second bottom surface and a plurality of second pads mounted on the second top surface. The metallic pillars are disposed between the first bottom surface and the second top surface. The metallic pillars electrically connect the first pad and the second pad.

Abstract: An electronic package module includes a circuit board having a supporting surface, at least one first electronic component, at least one second electronic component, and at least one molding compound. The first and second electronic components are mounted on the supporting surface. The molding compound is disposed on the supporting surface and covers the supporting surface partially. The molding compound encapsulates the first electronic component yet not the second electronic component.