Abstract:
본 발명은 도허티 증폭기 출력단 구성에 관한 것으로, 주 증폭부(carrier amplifier)와 보조 증폭부(peaking amplifier) 그리고 두 증폭부를 연결하는 콤팩트 λ/4 라인을 포함하는 것을 특징으로 한다. 두 증폭부를 연결하는 콤팩트 λ/4 라인은 상기 주 증폭부와 연결되어 병렬로 접지되는 제1 병렬 커패시터와; 상기 보조 증폭부와 연결되어 병렬로 접지되는 제2 병렬 커패시터와; 상기 주 증폭부와 상기 보조 증폭부를 연결하는 인덕터 또는 마이크로스트립 트랜스미션 라인을 포함한다. 그리고 본 발명에 따른 도허티 증폭기는 상기 주 증폭부와 상기 보조 증폭부를 연결하여 최종 출력으로 연결하는 매칭 네트워크 단과; 상기 주 증폭부와 상기 보조 증폭부의 전원입력으로 사용되는 λ/4 라인을 더 포함한다. 이에 의하여, 회로의 크기를 감소시키고 구조를 간략화 하면서도 증폭기의 선형성 및 고 효율을 유지할 수 있다.
Abstract:
A hybrid power divider is provided to reduce loss by equalizing resistance of an equivalent resistor to the resistance of an isolation resistor. A hybrid power divider includes an input port(210), a first output port(220), a second output port(230), an isolation port(240), and a dividing unit(250). The input port receives a wireless signal. The first output port transmits a first output signal branched from the inputted wireless signal to the outside. The second output port transmits a second output signal branched from the inputted wireless signal to the outside. The separation port balances the wireless signal. The dividing unit is connected to the input port at a first node, divides the wireless signal into the first and second output signals, the first output port at a second node, the second output port at a third node, and the separation port at a fourth node.
Abstract:
PURPOSE: A method for writing data for a non-volatile memory storage is provided to minimize the use of an external buffer and a bus. CONSTITUTION: A memory chip in which a page having the same logic page number with a current page to be recorded is recorded is searched(410). It is determined whether the current page is able to be recorded to the memory chip in which the page having the same logic page number with a current page to be recorded is recorded or not(430). It is saved in the memory chip in which the page in which the current page has the same logical page number as described above is saved(440).
Abstract:
PURPOSE: A method for improving performance of flash memory device and a flash memory device performing the same are provided to improve a processing speed and durability by reducing unnecessary recordings. CONSTITUTION: A buffer(120) stores data offered from a host device. In case the usage amount of the buffer excesses a certain level, a controller(130) selects sacrifice superblock based on the size and data access time of the updated data among logical superblocks saved in the buffer. The controller mixes data updated from the sacrifice superblocks, reconstructs to the sacrifice superblocks, and supplies the sacrifice superblocks through plural channels.
Abstract:
A Doherty amplifier is provided to improve efficiency by using a different bias in a main amplifier and an auxiliary amplifier. A Doherty amplifier includes a first parallel capacitor(31), a second parallel capacitor(32), a transmission line unit(33b), and a matching network unit(35). A first parallel capacitor is connected in parallel to a main amplifier(10). The second parallel capacitor is connected in parallel to an auxiliary amplifier(20). The first and second parallel capacitors are grounded. The transmission line unit connects the main amplifier and the auxiliary amplifier. The transmission line unit is one of an inductor and a microstrip transmission line. The matching network unit is diverged between the second parallel capacitor and the transmission line unit.
Abstract:
A Doherty amplifier is provided to improve efficiency while maintaining linearity by tuning output harmonic impedance of a carrier amplifier and a peak amplifier. A carrier amplifier performs the amplification operation of a signal regardless of the input signal level. A peak amplifier performs an amplification operation from a high power output when the input signal level is above the predetermined level. An output synthesizing circuit synthesizes and outputs the output of the carrier amplifier and the peak amplifier. An input branch circuit distributes the input signal to the carrier amplifier and the peak amplifier. A carrier amplifier output harmonic impedance tuning net(HTC) is installed in a rear part of the carrier amplifier and tunes the output harmonic impedance of the carrier amplifier. A peak amplifier output harmonic impedance tuning net is installed in the rear part of the peak amplifier and tunes the output harmonic impedance.