Abstract:
PURPOSE: A multi-channel beam scan receiver is provided to include a multi-channel antenna in a single substrate. CONSTITUTION: A switch (103) selects one of plurality of signals received through a multi-channel antenna. A first low-noise amplifier (105) firstly amplifies a signal selected in the switch. A band-pass filter (107) filters the firstly amplified signal. A second low-noise amplifier (109) secondly amplifies the filtered signal. A detector (111) converts the secondly amplified signal into voltage. [Reference numerals] (101) Multi-channel antenna; (103) Switch; (105) First low-noise amplifier; (107) Band-pass filter; (109) Second low-noise amplifier; (111) Detector; (115) DC amplifier
Abstract:
PURPOSE: A field effect transistor and a method for fabrication the same are provided to improve productivity and stability by not using a lithography process. CONSTITUTION: An active layer(31), a cap layer(32), an ohmic metal layer(33) and an insulating layer(34) are formed on a substrate(30). An insulating layer is etched by using a photoresist pattern as an etching mask. A metal is deposited on a gate recess region(37c) and the insulating layer to form a gate-electric field electrode layer(39).
Abstract:
본 발명은 밀리미터파 대역 스위치 회로에 관한 것으로서, 신호 포트 경로 상에 배치되어 관심 주파수에 정합되고, 입출력 전송선로와 수직으로 연결되는 트랜지스터 및 상기 입출력 전송선로의 상부 및 하부에 대칭적으로 배치되는 다수의 접지 비아홀을 포함하는 제1, 제2 스위치 셀; 상기 제1, 제2 스위치 셀의 바이어스 안정화를 위한 제1, 제2 캐패시터; 상기 제1, 제2 캐패시터와 각각 병렬 연결되어 상기 제1, 제2 스위치 셀을 제어하기 위한 제1, 제2 바이어스 패드; 및 특정 임피던스 값을 가지며, 터미널 포트를 경유하여 공통포트와 상기 제1 스위치 셀 또는 상기 공통포트와 상기 제2 스위치 셀을 연결하는 터미널 전송회로를 포함하며, 이에 따라 별도의 다른 스위치 소자를 사용하지 않고도 최적화 스위치 셀의 대칭 구조에 의해 회로 설계 및 레이아웃(layout)을 간단하게 함으로써, 격리도를 향상시킬 수 있으며, 저삽입손실과 함께 집적회로의 칩 사이즈를 줄일 수 있으므로 제조 공정의 수율과 집적도의 향상을 통해 제조비용을 감소시킬 수 있다. 밀리미터파 대역, 스위치 회로, 스위치 셀, 트랜지스터, 전송선로, 공통 포트, 비아홀, 컨트롤 바이어스 패드, 캐패시터.
Abstract:
PURPOSE: A method for manufacturing a pseudomorphic high electron mobility transistor device is provided to satisfy wideband characteristics and unconditionally stable conditions by including a negative feedback circuit. CONSTITUTION: In a method for manufacturing a pseudomorphic high electron mobility transistor device, an epitaxial substrate is provided(101). A source and a drain are formed on a substrate. The epitaxial substrate is processed by a gate recess etching including a dry and wet method to form a recess region. The gate(180) is formed in the recess region.
Abstract:
PURPOSE: A super high frequency amplifier and a bias circuit for the same are provided to optimize performance by adjusting a source voltage, regardless of a change in the properties of a depletion-type FET(Field Effect Transistor) due to the process change. CONSTITUTION: An amplifier circuit amplifies a high frequency signal through a depletion-type FET(30). An input matching circuit(20) matches the inputted high frequency signal in the depletion-type FET. An output matching circuit(40) matches the amplified signal, and thereby outputs the matched signal. A bias circuit(80) gives a negative value to a voltage between a gate and a source of the depletion-type FET by applying a positive voltage to the source of the depletion-type FET. The bias circuit tunes the voltage between the gate and the source by changing the positive voltage applied to the source.
Abstract:
A gold bump structure which can reduce defective proportion generated due to causes such as lead opening and the like in a process of bonding the gold bump to semiconductor chips and so on by improving non-uniformity of the gold bump with respect to thickness of a gold bump formed by a plating process, and a fabrication method of the gold bump structure are provided. A gold bump comprises: a seed metal layer formed on a substrate; a plating bump layer formed on an upper portion of the seed metal layer; and a domed gold-rich process alloy formed on an upper portion of the plating bump layer and made from a metal with a low melting point. A fabrication method of a gold bump comprises the steps of: forming a seed metal layer(23) on a substrate(21); plating and forming a gold bump layer(25) on the seed metal layer; forming a metal layer with a low melting point on the gold bump layer; and forming a domed gold-rich process alloy(27) on an upper portion of the low melting point metal layer-formed gold bump layer. The method further comprises the steps of: forming an adhesion layer(22) between the seed metal layer and the substrate; removing the exposed seed metal layer and the adhesion layer under the exposed seed metal layer; and forming a photosensitive film for forming patterns of the gold bump layer.
Abstract:
A method for manufacturing a pseudo morphic high electro mobility transistor is provided to improve the electric property and to increase breakdown voltage by forming a passivation layer having double recess structure. A cap layer(24) and a channel layer(22) are formed on a substrate(20). A source/drain(26) is formed on the cap layer. A first passivation layer(27) is formed, and then patterned to expose the cap layer in a channel region. A first recess structure is formed by removing the exposed cap layer. A second passivation layer is formed on the entire surface of the resultant structure. A second recess structure is formed by patterning the second passivation layer(29) to expose the substrate of the first recess structure. A multi-layered photosensitive film is formed, and then patterned to have an opening of gate shape and to expose the substrate through the second recess structure. A gate is formed to connect to the substrate through the second recess structure by removing the multi-layered photosensitive film, after depositing a metal on the resultant structure.
Abstract:
본 발명은 안정화 회로가 구비된 고주파 증폭기에 관한 것으로, 보다 상세하게는 소정의 고주파 신호를 증폭하기 위한 트랜지스터를 포함하는 고주파 증폭기에 있어서, 상기 트랜지스터의 입력단에 입력된 고주파 신호의 이득 손실을 방지함과 아울러 이득 안정도를 증가시키기 위한 저항과 캐패시터가 병렬로 구성된 안정화 회로가 직렬로 연결됨으로써, 고주파 증폭기의 이득 손실 없이 안정도를 향상시킬 수 있는 효과가 있다. 고주파 증폭기, 안정화 회로, 저항, 캐패시터, 임피던스, 트랜지스터, 입력 임피던스 정합부, 출력 임피던스 정합부, 바이어스 회로부
Abstract:
본 발명은 반도체 소자의 트랜지스터 및 그 제조 방법에 관한 것으로, 파이(П) 형태의 단면 구조와 미엔더(Meander) 형태의 평면 구조로 게이트 전극을 게이트 영역에 형성하여 게이트 면적을 증가시키고 이를 통해 게이트가 점유하는 공핍영역(Depletion layer)을 확장시킴으로써, 스위치 트랜지스터의 중요한 특성인 OFF상태에서의 소자 격리 특성 및 단위면적당 고전력 특성의 향상시킴과 동시에 두개의 T형 게이트 전극을 형성할 때 보다 안정된 반도체 공정을 이용함으로써 공정의 재현성을 확보할 수 있는 반도체 소자의 트랜지스터 및 그 제조 방법이 개시된다.
Abstract:
A pseudomorphic high electron mobility transistor (PHEMT) power device formed on a double planar doped epitaxial substrate and capable of operating with a single voltage source and a method for manufacturing the PHEMT power device are provided. The PHEMT power device includes: an epitaxial substrate including a GaAs buffer layer, an AlGaAs/GaAs superlattice layer, an updoped AlGaAs layer, a first doped silicon layer, a first spacer, an InGaAs electron transit layer, a second spacer, a second doped silicon layer having a different doping concentration from the first doped silicon layer, a lightly doped AlGaAs layer, and an undoped GaAs cap layer stacked sequentially on a semi-insulating GaAs substrate, a source electrode and a drain electrode formed on and in ohmic contact with the undoped GaAs cap layer; and a gate electrode formed on the lightly doped AlGaAs layer to extend through the undoped GaAs cap layer.