Abstract: In some aspects of the present disclosure, a bandgap reference circuit includes a first current mirror and a first resistor coupled to the first current mirror to provide a proportional to absolute temperature (PTAT) voltage. The circuit includes a second current mirror and a bipolar junction transistor (BJT) device coupled to the second current mirror to provide a complementary to the absolute temperature (CTAT) voltage. The circuit includes an output node to provide a bandgap voltage that is a weighted sum of the PTAT voltage and the CTAT voltage. The circuit includes a second resistor coupled between the output node and a first node, wherein the first node is coupled between the first resistor and the first current mirror. The circuit includes a third resistor coupled between the output node and a second node, wherein the second node is coupled between the BJT device and the second current mirror.

Abstract: A computer set for coupling to a disk drive and a battery unit, includes a disk-drive connecting port, a power diverter circuit and a power source. The connecting port includes a set of disk terminals, a set of battery terminals, and a set of power terminals. The diverter circuit is coupled electrically to the connecting port. The power source is electrically coupled to the diverter circuit such that when the computer set is coupled to the disk drive, the sets of disk and power terminals are electrically coupled to the disk drive and the power source supplies a first electrical power for the disk drive via the diverter circuit. When the computer set is coupled to the battery unit, the sets of battery and power terminals are coupled electrically to the battery unit so as to permit the battery unit to supply a second electrical power for the computer set via the diverter circuit.

Abstract: A multimedia system includes a portable device, a multimedia expansion apparatus and a second display. The portable device further includes a main body and a first display coupling with the main body, in which the main body has a first multimedia module and a switch module. The multimedia further includes an expansion port for coupling the portable device, a multimedia switch circuit, a plurality of signal output ports and a power control circuit for energizing the expansion port, the multimedia switch circuit and the signal output ports. The second display is coupled with one of the signal output ports. The switch module forwards a multimedia signal of the main body to one of the first multimedia module and the multimedia switch circuit, and the power control circuit is to terminate power output to while the portable device is separated from the expansion port of the multimedia expansion apparatus.

Abstract: A multimedia system includes a portable device, a multimedia expansion apparatus and a second display. The portable device further includes a main body and a first display coupling with the main body, in which the main body has a first multimedia module and a switch module. The multimedia further includes an expansion port for coupling the portable device, a multimedia switch circuit, a plurality of signal output ports and a power control circuit for energizing the expansion port, the multimedia switch circuit and the signal output ports. The second display is coupled with one of the signal output ports. The switch module forwards a multimedia signal of the main body to one of the first multimedia module and the multimedia switch circuit, and the power control circuit is to terminate power output to while the portable device is separated from the expansion port of the multimedia expansion apparatus.

Abstract: A computer set for coupling to a disk drive and a battery unit, includes a disk-drive connecting port, a power diverter circuit and a power source. The connecting port includes a set of disk terminals, a set of battery terminals, and a set of power terminals. The diverter circuit is coupled electrically to the connecting port. The power source is electrically coupled to the diverter circuit such that when the computer set is coupled to the disk drive, the sets of disk and power terminals are electrically coupled to the disk drive and the power source supplies a first electrical power for the disk drive via the diverter circuit. When the computer set is coupled to the battery unit, the sets of battery and power terminals are coupled electrically to the battery unit so as to permit the battery unit to supply a second electrical power for the computer set via the diverter circuit.