58results about How to "Eliminate impedance" patented technology

An electromagnetic composite metamaterial including an electromagnetic medium and a plurality of spaced electromechanical resonators disposed in or on the electromagnetic medium configured to control electromagnetic wave propagation properties in the electromagnetic composite metamaterial.

A programmable gain low noise amplifier includes a tail current transistor (Q3) having a source coupled to a first reference voltage (VDD) and a drain coupled to a tail current conductor (18) and, in a differential input embodiment, a plurality of pairs (Q4,5, Q7,8, Q10,11, Q13,14) of differentially coupled input transistors. Each pair includes a first input transistor having a gate coupled to a first input conductor (19A) and a drain coupled to a first output conductor (26A) and a second input transistor having a gate coupled to a second input conductor (19B), a source coupled to a source of the first transistor, and a drain coupled to a second output conductor (26B). The sources of the first and second input transistors of some or all of the pairs are selectively coupled to the tail current conductor (18) in it response to corresponding gain control signals (B1,2,3).

A socket terminal includes front and rear terminals. The front terminal includes a front contact-point portion that wipes off foreign material adhered to a terminal surface of a plug terminal. The rear terminal includes a rear contact-point portion that contacts the terminal surface wiped by the front contact-point portion. The socket terminal also includes a movable portion between a circuit-board connection portion and circuit board. The movable portion cancels a reduction in impedance of at least the front terminal and rear terminal for a transmission signal flowing from the circuit-board connection portion connected to the circuit board. This can provide a socket terminal allowing the rear contact-point portion to contact the terminal surface from which foreign material has been wiped off, and allowing impedance mismatching at a terminal transmission path to be eliminated; and to provide an electric connector including the socket terminal.

A miniaturized semiconductor device has a package substrate, a semiconductor chip mounted on the main surface of the package substrate and having plural LNAs each for amplifying a signal, an RF VCO for converting the frequency of the signal supplied from each LNA, and an IF VCO for converting the frequency of a signal supplied from a baseband. A plurality of ball electrodes are provided on the back surface of the package substrate. The package substrate is provided with a first common GND wire for supplying a GND potential to each of the LNAs, with a second common GND wire for supplying the GND potential to the RF VCO, and with a third common GND wire for supplying the GND potential to the IF VCO. The first, second, and third common GND wires are separated from each other.

The wiring needed to control all the functions in a vehicle is reduced, especially where the input source for operating a given function is remote from the function. A control member is provided that receives the input signal and converts it to a coded message that is applied to the power line. A function controller includes a coded reader and a control circuit for reading the code applicable to its associated function and controlling the function as instructed from the input signal. The control member also monitors the power line to insure that the message has been properly sent, and the message is repeated until proper transmission is confirmed.

The present invention relates to a contactless card in smart card field and a control method thereof. The contactless card comprises a card chip, an antenna resonant circuit, and a confirmation unit. The confirmation unit, being separated from the antenna resonant circuit and connected to the I / O interface of the card chip, is used for confirming a card operation command by a cardholder so as to send a confirmation message to the card chip. The control method can be realized according to the following steps: putting a contactless card into a valid range for its reader; determining by the contactless card whether a command transmitted from the reader needs to be confirmed by the cardholder, if not, responding to the command by the contactless card, otherwise waiting for confirmation message by the contactless card; and receiving the confirmation message from the cardholder and responding to the command by the contactless card. The present method provides the cardholder with the light on the control of command execution and prevents the information stored in the card from being stolen or mis-operation to the card, which improves the usability of the contactless card and eliminates the impedance and enhances the continuity of the antenna resonant circuit and brings the convenience to the cardholder.