Abstract: A control circuit for a synchronous rectification switch of a power converter is provided. The synchronous rectification switch and a transformer of the power converter are coupled to a connection node. The control circuit includes a first logic circuit, an integrating circuit, a setting comparator, a logic gate, and a second logic circuit. The first logic circuit provides a detection signal according to a detection voltage on the connection node. The integrating circuit performs an accumulation operation on the integrated voltage value based on the detection signal to generate a setting pulse. The setting comparator provides a comparison signal according to the detection voltage and a first predetermined voltage. The logic gate outputs a setting signal according to the setting pulse and the comparison signal. The second logic circuit continuously provides a turn-on control signal in response to the setting signal. The synchronous rectification switch is turned on in response to the turn-on control signal.

Abstract: A synchronous rectifier device for a power converter is provided. A power converter includes at least one secondary circuit and a transformer. The synchronous rectifier device includes a synchronous rectification circuit and a controller. The synchronous rectification circuit includes a synchronous rectification switch and a current receiving circuit. The synchronous rectification switch is coupled between the secondary circuit and a secondary winding of the transformer. The current receiving circuit provides a current signal based on a current flowing through the synchronous rectification switch. The controller controls the synchronous rectification switch according to the current signal. In a case that the synchronous rectification switch is turned off, when the current signal indicates that a current value of the current is greater than a predetermined value, the controller turns on the synchronous rectification switch.

Abstract: An electronic device includes a substrate, a hyperbolic magnet, a pair of depletion gates, a pair of barrier gates and a accumulation gate. The hyperbolic magnet is over the substrate and has a first magnet portion and a second magnet portion separated from each other. The first magnet portion and the second magnet portion have a first convex surface and a second convex surface facing the first convex surface, respectively. The depletion gates are separated from each other and between the first convex surface and the second convex surface over the substrate. The barrier gates are between the depletion gates. The accumulation gate is over the depletion gates and between the barrier gates.

Abstract: The disclosure provides a quantum device and a microwave device. The quantum device includes a first partition, a second partition, an upper circuit board, a lower circuit board and a flexible circuit. The second partition is arranged below the first partition. The first partition and the second partition are used to define an ultra-low temperature chamber of the quantum device. The upper circuit board, the lower circuit board and the flexible circuit are arranged in the ultra-low temperature chamber. The upper circuit board is disposed on a lower surface of the first partition. The lower circuit board is disposed on an upper surface of the second partition. The flexible circuit is electrically connected between the upper circuit board and the lower circuit board to provide multiple signal paths for mutual signal transmission between the upper circuit board and the lower circuit board.

Abstract: The disclosure is directed to a radio over fiber (RoF) network node, base station, and communication system. In one of the exemplary embodiments, the disclosure is directed to a radio over fiber (RoF) network node which includes not limited to: a laser source which transmits a first laser beam having a first wavelength; a first Electroabsorption Modulated Laser (EML) which modulates a first electrical signal into a second laser beam that is modulated and has a second wavelength; and a first optical coupler which is coupled to the laser source and the EML and transmits an output laser beam having a first carrier frequency which is determined based on a difference between the first wavelength and the second wavelength.

Abstract: The disclosure is directed to a radio over fiber (RoF) network node, base station, and communication system. In one of the exemplary embodiments, the disclosure is directed to a radio over fiber (RoF) network node which includes not limited to: a laser source which transmits a first laser beam having a first wavelength; a first Electroabsorption Modulated Laser (EML) which modulates a first electrical signal into a second laser beam that is modulated and has a second wavelength; and a first optical coupler which is coupled to the laser source and the EML and transmits an output laser beam having a first carrier frequency which is determined based on a difference between the first wavelength and the second wavelength.