Patent application number | Description | Published |
20080231369 | VARIABLE-GAIN LOW-NOISE AMPLIFIER - A variable-gain low-noise amplifier is provided. The variable-gain low-noise amplifier includes a first load, a second load, an input transistor, a pole/zero control circuit, and a gain control circuit. A first terminal of the first load is connected to a power-source voltage, and a second terminal thereof is connected to an output terminal. The second load is operated in response to a bias voltage, and a first terminal thereof is connected to the output terminal. A first terminal of the input transistor is connected to the second terminal of the second load, and a gate thereof is connected to an input terminal. The pole/zero control circuit adjusts frequency characteristics and a gain in response to at least one pole/zero control signal. A first terminal of the pole/zero control circuit is connected to the input terminal, and a second terminal thereof is connected to the output terminal. The gain control circuit adjusts the gain in response to at least one gain control signal. A first terminal of the gain control circuit is connected to a common terminal of the second load and the input transistor, and a second terminal thereof is connected to the input terminal, and a third terminal thereof of is connected to a ground voltage. | 09-25-2008 |
20120299633 | FREQUENCY UP AND DOWN CONVERTER - A frequency up and down converter, in which, when down converting a high frequency signal into an intermediate frequency signal or up converting an intermediate frequency signal into a high frequency signal by controlling switching elements using a local oscillator signal, a signal with a frequency to be converted is controlled a number of times during one cycle of the local oscillator signal, whereby the local oscillator signal with a frequency lower than an original frequency may be used. Transistors are added in parallel to switching transistors disposed in a frequency down conversion unit or a frequency up conversion unit, and local oscillator signals with predetermined phases and pulse widths are provided to the gates of the transistors such that a high frequency signal or an intermediate frequency signal is transferred to an output terminal at least two times during one cycle of a local oscillator signal. | 11-29-2012 |
20130091952 | Apparatus For Measuring Concrete Strength And Slip Form Method For Constructing Vertical Concrete Column Member Using Surface Wave Velocity Measurement Device - An apparatus for measuring the strength of concrete using a surface wave velocity including an ultrasonic transmission and reception probe is provided. The apparatus is configured to include a surface wave velocity measurement device including an ultrasonic transmission probe and an ultrasonic reception probe. Further, a method of constructing the slip form of a concrete column member is provided. The method is capable of reducing the construction period by raising a concrete form rapidly and safely using a method of determining the slip-up time of the slip form based on the strength of concrete measured by the apparatus. | 04-18-2013 |
20130094562 | TRANSMITTER AND TRANSMITTING METHOD USING DELAY LOCKED LOOP - An NFC transmitter using a delay-locked loop and an NFC transmission method thereof are provided. The NFC near field communication (NFC) transmitter includes a delay-locked loop (DLL) that outputs a reference clock and a delayed clock using the reference clock and a value of a duty code which are input, a clock output unit that receives the reference clock and the delayed clock, outputs the reference clock in any of a high section and a low section of input data, and outputs a converted clock having a duty ratio using the reference clock and the delayed clock in the other of the high section and the lower section of the input data, and an RF signal generator that generates an RF signal using a PWM (Pulse Width Modulation) signal input from the clock output unit. | 04-18-2013 |
20130143510 | RECEIVING DEVICE AND METHOD FOR REMOVING MISMATCH IN WIRELESS COMMUNICATION SYSTEM, AND LOW-POWER AMPLIFIER THEREFOR - The present invention relates to a receiving device and method for removing a mismatch in a wireless communication system, and to a low noise amplifier (LNA) therefor. According to the present invention, the receiving method for removing the mismatch comprises the steps of: distinguishing the type of input signal received through a wireless network; controlling such that a common bias is applied to transistors within a low noise amplifier, if said input signal is a wideband signal; and outputting a signal from which said mismatch has been removed, by using a current mirror mode in which current paths within said low noise amplifier are crossed. | 06-06-2013 |
20130147539 | DOWN-CONVERTER, UP-CONVERTER, RECEIVER AND TRANSMITTER APPLYING THE SAME - A down-frequency conversion circuit and up-frequency conversion circuit, and a receiver and transmitter applying the same are provided. The down-frequency conversion circuit includes a harmonic mixer and general mixer, and thus becomes able to convert frequency using one LO (Local Oscillator) frequency, thereby reducing burden on generating LO frequency. | 06-13-2013 |
20140096476 | Large Scale Concrete Girder Using UHPC Member as Form and Structural Element and Its Manufacturing Method - A concrete girder includes a pair of ultra high performance concrete (UHPC) side form members, each having a lower flange and a web perpendicular thereto, extending in the longitudinal direction and being prepared with UHPC by using a precast, the pair of UHPC side form members being disposed in parallel so that lateral side surfaces of the lower flanges are successively positioned; and concrete placed in a space between the pair of UHPC side form members so that the placed concrete is integrated with the pair of UHPC side form members to form both traverse side surfaces thereof and the lower flange forms a lower flange thereof. | 04-10-2014 |
20150065075 | RECEIVING DEVICE AND METHOD FOR REMOVING MISMATCH IN WIRELESS COMMUNICATION SYSTEM, AND LOW-POWER AMPLIFIER THEREOF - The present invention relates to a receiving device and method for removing a mismatch in a wireless communication system, and to a low noise amplifier (LNA) therefor. According to the present invention, the receiving method for removing the mismatch comprises the steps of: distinguishing the type of input signal received through a wireless network; controlling such that a common bias is applied to transistors within a low noise amplifier, if said input signal is a wideband signal; and outputting a signal from which said mismatch has been removed, by using a current mirror mode in which current paths within said low noise amplifier are crossed. | 03-05-2015 |