| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 61 | Variable gain amplifier | US11604829 | 2006-11-28 | US20070132512A1 | 2007-06-14 | Takahito Miyazaki; Iwao Kojima |
| A variable gain amplifier is provided that scarcely suffers disturbance or interference such as carrier leak from other circuit blocks even when a plurality of circuits are constructed on the same semiconductor substrate, and that has low output impedance fluctuation. For the purpose of this, in a variable gain amplifier, the ground terminal of a signal amplifying transistor is connected to a dedicated grounding pad to which the other circuit blocks are not connected, so that disturbance or interference such as carrier leak from other circuit blocks is reduced. Further, the ground terminal of an output impedance compensation circuit is also connected to the same grounding pad described above, so that further disturbance or interference is avoided. As a result, the circuit scarcely suffers disturbance or interference such as carrier leak from other circuit blocks, so that output impedance fluctuation is reduced. | ||||||
| 62 | Oscillator amplifier circuit operable to provide symmetric current limiting and method of same | US11009816 | 2004-12-10 | US07196586B1 | 2007-03-27 | Jonathon Stiff; Aaron Brennan |
| An amplifier circuit operable to provide symmetric current limiting. The amplifier circuit includes a common source amplifier for sourcing a current and receiving an voltage input, a current source, and a current limiting device coupled between the common source amplifier and the current source. The current limiting device is operable to limit the current sourced by the common source amplifier. A bias network coupled to the current limiting device biases the current limiting device. An output is coupled to the current limiting device. The amount of current that is sourced to the output of the amplifier circuit may be limited, such that current limiting is symmetrical. | ||||||
| 63 | AMPLIFIER WITH IMPROVED NOISE REDUCTION | EP14738698.1 | 2014-06-18 | EP3014765A1 | 2016-05-04 | HUANG, Wenchang; DHANASEKARAN, Vijayakumar |
| An amplifier with improved noise reduction is disclosed. In an exemplary embodiment, an apparatus includes at least one capacitor configured to receive an adjustable current and generate a corresponding ramp voltage configured to control coupling between a main amplifier output and a secondary amplifier output. The apparatus also includes at least one comparator configured to adjust the adjustable current to generate the ramp voltage with selected ramp-up or ramp-down voltage characteristics. | ||||||
| 64 | AMPLIFIER WITH IMPROVED NOISE REDUCTION | EP12743265.6 | 2012-06-28 | EP2727241A1 | 2014-05-07 | DHANASEKARAN, Vijayakumar |
| An amplifier with improved noise reduction is disclosed. In one implementation, an amplifier is provided that includes a main output stage configured to output an amplified signal at a main output terminal, a secondary output stage configured to output a copy of the amplified signal at a secondary output terminal, and a signal coupler configured to provide a variable resistance coupling between the secondary output terminal and the main output terminal to reduce noise at the main output terminal. | ||||||
| 65 | Mobile communications device including an RF transmitter providing impedance fluctuation dampening and related methods | EP12170263.3 | 2012-05-31 | EP2670049A1 | 2013-12-04 | Shaw, Dennis Keith; Madabusi Srinivasan, Prasad Venkatesh |
A mobile communications device (30) may include an RF signal source (31)configured to generate RF signals over an RF frequency band, and an RF transmitter coupled to the RF signal source (31). The RF transmitter may include an RF amplifier (33) configured to operate over different power control levels. The RF amplifier (33) may have an input configured to receive the RF signals from the RF signal source (31) and an output having an impedance which changes based upon changes between the different power control levels. The RF transmitter may further include a shunt resistor (34) coupling the output of the amplifier (33) to a voltage reference (35), and the shunt resistor (34) may be configured to decrease a highest impedance change of the RF amplifier output to below a threshold impedance level. An antenna (36) may be coupled to the output of the RF amplifier (33).
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| 66 | AMPLIFIER ARCHITECTURE FOR POLAR MODULATION | EP07826335.7 | 2007-09-10 | EP2067253B1 | 2010-08-04 | DE GRAAUW, Antonius J.M.; VAN DEN OEVER, Leon C.M. |
| The present invention relates to an electronic device for power efficient linear amplification. The electronic device includes an amplifier (RF-PA) for amplifying a phase modulated signal (PM). The amplifier (RF-PA) is adapted to be controlled by a first modulating signal (AM high) for modulating the amplitude of the phase modulated signal (PM) above a predetermined amplitude value. The electronic device is further adapted to attenuate an output signal of the amplifier (RF-PA) for providing amplitude modulation below the predetermined amplitude value. | ||||||
| 67 | AMPLIFIER ARCHITECTURE FOR POLAR MODULATION | EP07826335.7 | 2007-09-10 | EP2067253A2 | 2009-06-10 | DE GRAAUW, Antonius J.M.; VAN DEN OEVER, Leon C.M. |
| The present invention relates to an electronic device for power efficient linear amplification. The electronic device includes an amplifier (RF-PA) for amplifying a phase modulated signal (PM). The amplifier (RF-PA) is adapted to be controlled by a first modulating signal (AM high) for modulating the amplitude of the phase modulated signal (PM) above a predetermined amplitude value. The electronic device is further adapted to attenuate an output signal of the amplifier (RF-PA) for providing amplitude modulation below the predetermined amplitude value. | ||||||
| 68 | Low noise amplifier and N-mode gain control circuit therefor | EP07117823.0 | 2007-10-03 | EP2045913A1 | 2009-04-08 | GIL GALI, Ignacio c/o Epson Europe Electronics; CAIRO MOLINS, Josep Ignasi c/o Epson Europe |
A LNA (1) has at least one output coupled to an RF mixer (2). In order to provide the LNA (1) with selectable n-gain modes, a gain control circuit (6) is inserted to its output, which includes at least one transistor, preferably a MOSFET, connected in series to a capacitive impedance. The transistor is biased by a DC voltage which switches its operating point between saturation regime and cut-off regime in correspondence to a low-gain mode and a high-gain mode of the LNA (1) respectively. The capacitance from the capacitive impedance can be changed, by using a bank of capacitors or varactors, in order to vary the gain level of the LNA (1) when operating in the low-gain mode. The invention also relates to an RF transmitter and/or receiver including the low noise amplifier and mixer front end, and to a method for gain control of said low noise amplifier.
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| 69 | 개선된 잡음 감소를 갖는 증폭기 | KR1020147002167 | 2012-06-28 | KR101625768B1 | 2016-05-30 | 다나세카란비자야쿠마르 |
| 개선된클릭및 팝잡음감소를갖는증폭기가개시된다. 일구현에있어서, 증폭된신호를메인출력단자 (112) 에출력하도록구성된메인출력스테이지 (106), 증폭된신호의사본을보조출력단자 (116) 에출력하도록구성된보조출력스테이지 (108), 및메인출력단자 (112) 에서의클릭및 팝잡음을감소시키기위해보조출력단자 (116) 와메인출력단자 (112) 사이에가변저항커플링을제공하도록구성된신호커플러 (118) 를포함하는증폭기 (100) 가제공된다. | ||||||
| 70 | 개선된 잡음 감소를 갖는 증폭기 | KR1020147002167 | 2012-06-28 | KR1020140040254A | 2014-04-02 | 다나세카란비자야쿠마르 |
| 개선된 클릭 및 팝 잡음 감소를 갖는 증폭기가 개시된다. 일 구현에 있어서, 증폭된 신호를 메인 출력 단자 (112) 에 출력하도록 구성된 메인 출력 스테이지 (106), 증폭된 신호의 사본을 보조 출력 단자 (116) 에 출력하도록 구성된 보조 출력 스테이지 (108), 및 메인 출력 단자 (112) 에서의 클릭 및 팝 잡음을 감소시키기 위해 보조 출력 단자 (116) 와 메인 출력 단자 (112) 사이에 가변 저항 커플링을 제공하도록 구성된 신호 커플러 (118) 를 포함하는 증폭기 (100) 가 제공된다. | ||||||
| 71 | 온도보상 버퍼증폭회로 | KR1020130063194 | 2013-06-03 | KR1020140141890A | 2014-12-11 | 진옥상 |
| 버퍼증폭회로에서 트랜지스터에 바이어스 전류를 공급하기 위한 바이어스 회로와, 주위온도 변화에 대한 동작특성 안정화회로가 설치된 온도보상 버퍼증폭회로.
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| 72 | 진동형 틸팅장치의 전류 제한 회로 | KR1020050076273 | 2005-08-19 | KR1020070021706A | 2007-02-23 | 우상민; 문양호; 박경신; 최동원; 김재경; 이칠성 |
| 본 발명은 진동형 틸팅장치의 전류 제한 회로에 관한 것이다. 본 발명에 따른 진동형 틸팅장치의 전류 제한 회로는 + 입력단자에는 입력전압이 접속된 연산증폭기와, 상기 연산증폭기의 출력단자와 상기 + 입력단자 사이에 접속된 제1 이득저항과, 상기 입력전압과 상기 + 입력단자 사이에 접속된 제2 이득저항과, 상기 연산증폭기를 구동하는 구동전압과, 상기 구동전압과 상기 연산증폭기 사이에 접속되는 조정저항을 포함하며, 상기 조정저항에 의해 상기 연산증폭기의 포화전압이 낮아지기 때문에 코일에 발생하는 발열량을 줄일 수 있게 된다. 포화전압, 연산증폭기, 틸팅장치 | ||||||
| 73 | AMPLIFIER ARCHITECTURE FOR POLAR MODULATION | PCT/IB2007053647 | 2007-09-10 | WO2008032264A2 | 2008-03-20 | DE GRAAUW ANTONIUS J M; VAN DEN OEVER LEON C M |
| The present invention relates to an electronic device for power efficient linear amplification. The electronic device includes an amplifier (RF-PA) for amplifying a phase modulated signal (PM). The amplifier (RF-PA) is adapted to be controlled by a first modulating signal (AM high) for modulating the amplitude of the phase modulated signal (PM) above a predetermined amplitude value. The electronic device is further adapted to attenuate an output signal of the amplifier (RF-PA) for providing amplitude modulation below the predetermined amplitude value. | ||||||
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