摘要:
A re-reconfigurable built-in antenna of a portable terminal is provided. The antenna includes an antenna radiator having a feeding pad electrically connected to a feeding portion of a main board of the terminal and at least one ground pad disposed in a position different from that of the feeding pad for selectively establishing an electrical connection to a ground portion of the terminal, and a switching element, commonly connected to the at least one ground pad of the antenna radiator, for selectively establishing an electrical connection to the ground portion by a switching operation. The antenna radiator changes a shape of the antenna radiator by using the selective electrical connection of the ground portion so as to have various operational frequency bands and radiation properties.
摘要:
A multi-band built-in antenna of a portable terminal is provided. The antenna includes a first antenna radiator on a front surface of a substrate (e.g., a main board), and a second antenna radiator on an opposite surface of the substrate. The substrate has ground surfaces on both sides separated from a non-ground area on which the radiators are disposed. The first radiator may be in the form of a Planar Inverted F Antenna (PIFA), with a first end branched off into two parts, one part used for power feeding and the other part electrically coupled to the ground surface. The first radiator has a portion that extends from the first end to an opposite end. The second radiator is continuous from the opposite end of the first radiator through a via (hole) in the main board.
摘要:
A mobile communication system has a multi-band antenna capable of receiving and processing signals of GPS, CDMA, and PCS bands. In the system, a GPS processing section receives a signal of a first frequency band, so as to generate global positioning information. A communication signal processing section receives signals of a second frequency band lower than the first frequency band and a third frequency band higher than the first frequency band, demodulates the received signals , while modulating signals to be transmitted of the second frequency band and the third frequency band and outputting the modulated signals. The multi-band antenna has a dual-pitch helical antenna which includes first and second helical coil portions having different pitches, so that the first and second helical coil portions have different impedances for the signals of the first to third frequency bands. A frequency band separator section connected between the multi-band antenna and the GPS processing section and communication processing section supplies the signal of the first frequency band to the GPS processing section while supplying the signals of the second and third frequency bands to the communication processing section.
摘要:
An antenna apparatus for a folder type mobile phone, wherein a first antenna is installed in a main body of the folder type mobile phone, and a second antenna is installed in the folder. The folder type mobile phone installs a main antenna apparatus in the main body, and an antenna apparatus for maximizing the diversity effect in the folder. As a result, it becomes more convenient to carry the folder type mobile phone based on the diversity mode, while securing a broader separation distance between two antennas at the same time.
摘要:
A built-in antenna apparatus for a Global Positioning System (GPS) of a portable terminal is provided. The apparatus includes a case frame for forming an exterior of the terminal, a main board fastened by the case frame and having a feeding portion and a ground portion of an antenna radiator, and an antenna radiator having a feeding point and ground point to be electrically connected to the feeding portion and ground portion of the main board, and is curved in a horizontal direction and a vertical direction of the terminal about a center of one upper-side corner of the terminal.
摘要:
A built-in antenna apparatus for a Global Positioning System (GPS) of a portable terminal is provided. The apparatus includes a case frame for forming an exterior of the terminal, a main board fastened by the case frame and having a feeding portion and a ground portion of an antenna radiator, and an antenna radiator having a feeding point and ground point to be electrically connected to the feeding portion and ground portion of the main board, and is curved in a horizontal direction and a vertical direction of the terminal about a center of one upper-side corner of the terminal.
摘要:
A resonant inverter includes a first driver and a second driver for driving a first and second switching devices, respectively, a dead time generator for generating a first drive signal and a second drive signal respectively, a current-controlled oscillator for supplying, to the dead time generator, an output clock having a frequency determined based on a first current input to the current-controlled oscillator, and a current mirror for supplying the first current to the current-controlled oscillator in an amount proportional to a second current flowing through an external resistor. The current mirror includes a track/hold circuit, to supply the second current in an amount equal to an amount of the second current supplied before a variation in the amount of the second current, during a transition of an output signal between the first and second switching devices.
摘要:
A method of manufacturing a nonvolatile memory device includes forming a plurality of device isolation regions in a semiconductor substrate, forming a tunneling insulation layer on the semiconductor substrate, forming a first preliminary polysilicon layer in communication with the tunneling insulation layer and the device isolation regions, forming a preliminary amorphous silicon layer on the first preliminary silicon layer, forming a second preliminary polysilicon layer on the preliminary amorphous silicon layer, and patterning the second preliminary polysilicon layer, the preliminary amorphous silicon layer, and the first preliminary polysilicon layer to form a floating gate layer.
摘要:
A logic circuit for high-side gate driver includes a p-MOSFET array connected to a first voltage source, an n-MOSFET array connected to a second voltage source, and a resistor arranged between the p-MOSFET array and the n-MOSFET array, wherein a first node between the resistor and at least one of the p-MOSFETs in the p-MOSFET array is connected to a first output terminal, and a second node between the resistor and at least one of the n-MOSFETs in the n-MOSFET array is connected to a second output terminal. An additional logic circuit can include a second p-MOSFET array, a second n-MOSFET array, and a second resistor between the second p-MOSFET array and the second n-MOSFET array, where an output signal from an output terminal between the first resistor and the first n-MOSFET array is fed back to the second p-MOSFET array and the second n-MOSFET array, and an output signal from an output terminal between the second resistor and the second n-MOSFET array is fed back to the first p-MOSFET array and the first n-MOSFET array.
摘要:
A clock driver is provided. A first driving unit is configured with a plurality of drivers and receives a first clock signal to drive a first pumping clock. A second driving unit is configured with a plurality of drivers and receives a second clock signal to drive a second pumping clock. A charge recycling switch is connected between an output terminal of the first driving unit and an output terminal of the second driving unit. A switch controller selectively transfers an input clock signal of the first or second driving unit to the charge recycling switch in response to the first and second pumping clock signals.