| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 181 | APPARATUS AND METHOD FOR A SWITCHED CAPACITOR ARCHITECURE FOR MULTI-BAND DOHERTY POWER AMPLIFIERS | US13247103 | 2011-09-28 | US20120092074A1 | 2012-04-19 | Naveen YANDURU; Robert MONROE; Mike BROBSTON |
| An apparatus and method for a switched capacitor architecture for multi-band Doherty power amplifiers are provided. The apparatus is for amplifying Radio Frequency (RF) signals, and the apparatus includes a multi-band Power Amplifier (PA) including a plurality of input matching circuits including switchable capacitors, and a plurality of output matching circuits including the switchable capacitors, wherein the multi-band PA is tunable to more than one RF frequency band. | ||||||
| 182 | SYSTEM AND METHOD FOR COMPENSATING FOR CHANGES IN AN OUTPUT IMPEDANCE OF A POWER AMPLIFIER | US12796559 | 2010-06-08 | US20110298535A1 | 2011-12-08 | Freerk Van Rijs; Alexander Otto Harm |
| System and method for compensating for changes in an output impedance of a power amplifier uses an impedance compensating circuit with an impedance inverter coupled to the power amplifier. The impedance inverter of the impedance compensating circuit is configured such that an output impedance of the impedance inverter is proportional to the inverse of the output impedance of the power amplifier to compensate for changes in the output impedance of the power amplifier. | ||||||
| 183 | TUNABLE RF FILTER | US12678507 | 2008-09-15 | US20100201437A1 | 2010-08-12 | Mohamed Bouhamame; Luca Lococo; Sebastien Robert |
| A tunable RF filter, comprising: an emitter follower stage (2); and a common emitter stage (4); the common emitter stage (4) providing feedback to the emitter follower stage (2). The common emitter stage (4) may comprise a first transistor (Ti) being the only transistor of the common emitter stage (4); and the emitter follower stage (2) may comprise a second transistor (T2) being the only transistor of the emitter follower stage (2). A further tunable RF filter provides improved linearity, comprising: an emitter follower stage (22); a joint common emitter and emitter follower stage (24); and a gain stage (26); a common emitter output of the joint common emitter and emitter follower stage (24) providing feedback to the emitter follower stage (22), and an emitter follower output of the joint common emitter and emitter follower stage (24) providing an input to the gain stage (26). | ||||||
| 184 | Semiconductor circuit | US12195051 | 2008-08-20 | US07750740B2 | 2010-07-06 | Yusuke Inoue |
| There are included a Wilkinson divider/combiner dividing an input signal, amplifying elements amplifying outputs of the Wilkinson divider/combiner, and a Wilkinson divider/combiner combining outputs of respective amplifying elements. A variable capacitor element is connected to a branch point of a signal transmission path in the Wilkinson divider/combiner. A capacitance value of the variable capacitor element is controlled in correspondence with a frequency of an input signal, whereby a matching frequency is corrected to increase an operating frequency band. | ||||||
| 185 | Integrated capacitor shield for balun in MRI receivers | US11609282 | 2006-12-11 | US07652476B2 | 2010-01-26 | Michael A. de Rooij; Eladio Clemente Delgado |
| A balun is included in a magnetic resonance imaging system. The balun conditions electromagnetic signals received from at least one RF receiver coil. The balun includes a balun shield having an integrated capacitor therein. The balun blocks unwanted feedback from effecting performance of any components contained within the balun shield. | ||||||
| 186 | DEVICE AND METHOD FOR BIASING A TRANSISTOR AMPLIFIER | US12416538 | 2009-04-01 | US20090184770A1 | 2009-07-23 | Ping Wai Li; Cong Ke Li; Wei Wang |
| Provided is circuitry for biasing a transistor amplifier with a DC-voltage signal, the transistor amplifier having a first input terminal, a second input terminal, and an output terminal coupled to the second input terminal. The circuitry includes a sensor capacitor connected to the first input terminal and an impedance transistor arranged in parallel with said capacitor, the transistor and capacitor forming a low-pass filter. The circuitry also includes a biasing circuit configured to controllably vary a DC-voltage signal for operatively biasing the amplifier, the biasing circuit including a cascaded current arrangement configured to subdivide a reference current into smaller currents for selectively generating voltage potentials for biasing the impedance transistor to adjustably filter a noise component of the DC-voltage signal via the low-pass filter before the DC-voltage signal is provided to the first input terminal. | ||||||
| 187 | LOW-NOISE AMPLIFIER | US11895427 | 2007-08-24 | US20090051441A1 | 2009-02-26 | Jason H. Branch; Lawrence E. Connell; Patrick L. Rakers; Poojan A Wagh |
| Methods and corresponding systems in a low noise amplifier include selecting a selected sub-band for amplifying, wherein the selected sub-band is one of a plurality of sub-bands, wherein each sub-band is a portion of a frequency band, and wherein each sub-band has a corresponding sub-band center frequency. Next, a gate-source capacitor is adjusted so that a real part of an LNA input impedance corresponds to a real part of a source impedance at the selected sub-band center frequency. A match capacitor is also adjusted so that the LNA input impedance corresponds to the complex conjugate of the source impedance at the selected sub-band center frequency. The gate-source capacitor and the match capacitor can each be adjusted by recalling capacitor values from memory that correspond to the selected sub-band, and connecting selected capacitor components in response to the recalled capacitor values. | ||||||
| 188 | Low-noise amplifier | US11895427 | 2007-08-24 | US07495515B1 | 2009-02-24 | Jason H. Branch; Lawrence E. Connell; Patrick L. Rakers; Poojan A. Wagh |
| Methods and corresponding systems in a low noise amplifier include selecting a selected sub-band for amplifying, wherein the selected sub-band is one of a plurality of sub-bands, wherein each sub-band is a portion of a frequency band, and wherein each sub-band has a corresponding sub-band center frequency. Next, a gate-source capacitor is adjusted so that a real part of an LNA input impedance corresponds to a real part of a source impedance at the selected sub-band center frequency. A match capacitor is also adjusted so that the LNA input impedance corresponds to the complex conjugate of the source impedance at the selected sub-band center frequency. The gate-source capacitor and the match capacitor can each be adjusted by recalling capacitor values from memory that correspond to the selected sub-band, and connecting selected capacitor components in response to the recalled capacitor values. | ||||||
| 189 | Variable capacitor circuit and integrated circuit containing the same | US11070259 | 2005-03-03 | US07486132B2 | 2009-02-03 | Akira Uemura |
| A variable capacitance circuit includes a MOS capacitor, and an application voltage switching section configured to change an application voltage to the MOS capacitor to change a capacitance of the MOS capacitor. The variable capacitance circuit connects the MOS capacitor to an electronic circuit. Here, the electronic circuit may be a voltage amplification circuit, and the variable capacitance circuit may function as an amplification gain switching circuit configured to switch an amplification gain of the voltage amplification circuit, by changing the capacitance to be connected to the voltage amplification circuit. | ||||||
| 190 | ANALOG CIRCUIT | US12234105 | 2008-09-19 | US20090009253A1 | 2009-01-08 | Hisao SHIGEMATSU |
| A resistor (9-1) and a resistor (11-1) are connected in parallel with each other between a source of an input transistor (7-1) and the ground. A switch (12-1) is provided between the resistor (11-1) and the source. A variable resistor circuit may be constituted by the resistor (9-1), the resistor (11-1) and the switch (12-1). Further, a capacitor (10-1) and a variable capacitor (13-1) are connected in series with each other between the source and the ground. A control terminal (14-1) to which a voltage is applied when capacitance of the variable capacitor (13-1) is controlled is provided between the capacitor (10-1) and the variable capacitor (13-1). A variable capacitor circuit may be constituted by the capacitor (10-1) and the variable capacitor (13-1). An input capacitance change circuit may be constituted by the variable resistor circuit and the variable capacitor circuit. | ||||||
| 191 | Low Noise Amplifier | US12207247 | 2008-09-09 | US20090009250A1 | 2009-01-08 | Hiroyuki Satoh; Hiroshi Yamazaki |
| For a first transistor, a source thereof is coupled to an input terminal and a drain thereof is coupled to an output terminal. A first variable impedance circuit is arranged between a gate of the first transistor and ground, and the impedance thereof is changed according to a first control signal. A second variable impedance circuit is arranged between the gate and the source of the first transistor, and the impedance thereof is changed according to a second control signal. Furthermore, an impedance circuit is arranged between the gate of the first transistor and a power supply. The ratio of the impedances of the first and second variable impedance circuits can be set to an arbitrary value according to the first and second control signals in order to change the gain of the low noise amplifier. As the result, the generation of unwanted thermal noise can be prevented. | ||||||
| 192 | FULLY DIFFERENTIAL SENSING APPARATUS AND INPUT COMMON-MODE FEEDBACK CIRCUIT THEREOF | US11467170 | 2006-08-25 | US20070285166A1 | 2007-12-13 | Tim K. SHIA; Chi-Chen Chung; Long-Xi Chang |
| A fully differential sensing apparatus and an input common mode feedback circuit are provided. The input common mode feedback circuit includes a common mode error amplifier and a plurality of adaptive conductance elements. Each adaptive conductance element behaves with a low impedance characteristic when its anode voltage is greater than its cathode voltage by a positive threshold voltage or, on the contrary, when the anode voltage of such an adaptive conductance element is lower than its cathode voltage by a negative threshold voltage, the adaptive element also behaves with a low impedance characteristic; otherwise the aforementioned adaptive conductance element behaves with a high impedance characteristic. The common mode error amplifier and a plurality of such adaptive conductance elements form a negative feedback loop to effectively maintain the input common voltage of a fully differential input amplifier, which can be used for a fully differential sensing apparatus. | ||||||
| 193 | Circuit topology for reduced harmonic distortion in a switched-capacitor programmable gain amplifier | US11283915 | 2005-11-21 | US07276962B1 | 2007-10-02 | Loren Justin Tomasi |
| A switched-capacitor programmable gain amplifier (PGA) has improved circuit performance that avoids impracticably small capacitors, while providing low total harmonic distortion (THD) and reasonable gain linearity. The sampling capacitor (CS) in the PGA is designed with a C-2C capacitor array. Gain settings from the C-2C capacitor array arranged for selection with constant VGS switches. The gain of the resulting PGA corresponds to the ratio of the effective capacitance of the C-2C array and the effective capacitance value of the feedback capacitor (CF). The resulting performance of the PGA has reduced charge injection and clock feed-through errors, and thus reduced THD. | ||||||
| 194 | Method and apparatus for minimizing the number of power amplifiers required under multiple transmission conditions | US10235215 | 2002-09-05 | US07239268B1 | 2007-07-03 | William J. Skudera, Jr., deceased |
| The number of power amplifiers required to amplify a plurality of transmission signals is reduced by using non-linear transmission lines (NTL) circuits. In general, a “combining” NTL circuit is used to combine the plurality of transmission signals to form a soliton pulse. The soliton pulse is then amplified such that each of its component transmission signals are amplified. A “dividing” NTL circuit is then used to divide the amplified soliton pulse into its component amplified transmission signals. The amplified transmission signals can therefore be transmitted over a communications channel without requiring a separate power amplifier for each. | ||||||
| 195 | LOAD AND MATCHING CIRCUIT HAVING ELECTRICALLY CONTROLLABLE FREQUENCY RANGE | US10708463 | 2004-03-05 | US20050195541A1 | 2005-09-08 | Hsiao-Chin Chen; Chien-Kuang Lee |
| A first inductor or resistor has a first terminal connected to a first node and a second terminal connected to a supply node or AC ground node. The first node is a first point of connection between a first circuit and a second circuit. A first varactor has a first terminal connected to the first node and a second terminal connected to a control signal. An optional control signal generator generates the control signal according to the C-V curve of the first varactor in order to adjust the capacitance of the first varactor, optimize the energy transfer between the first circuit and the second circuit and also can match the output impedance of the first circuit to the input impedance of the second circuit. | ||||||
| 196 | High frequency amplifier | US10282000 | 2002-10-29 | US06731175B1 | 2004-05-04 | Yung-Hung Chen |
| A high frequency amplifier. The amplifier includes two transistors for signal amplification, and input and output matching circuits. There are variable capacitors and resistors in the matching input and output circuits. A received signal strength indicator receives the band-pass filtered intermediate-frequency signal and generates an indication signal corresponding to the amplitude of the received signal. The variable capacitors and resistors are tuned by the indication signal from the received signal strength indicator. Thus, the gain of the high frequency amplifier is automatically controlled. | ||||||
| 197 | TUNABLE RF FILTER | PCT/IB2008053721 | 2008-09-15 | WO2009037625A3 | 2009-07-23 | BOUHAMAME MOHAMED; LOCOCO LUCA; ROBERT SEBASTIEN |
| A tunable RF filter, comprising: an emitter follower stage (2); and a common emitter stage (4); the common emitter stage (4) providing feedback to the emitter follower stage (2). The common emitter stage (4) may comprise a first transistor (Ti) being the only transistor of the common emitter stage (4); and the emitter follower stage (2) may comprise a second transistor (T2) being the only transistor of the emitter follower stage (2). A further tunable RF filter provides improved linearity, comprising: an emitter follower stage (22); a joint common emitter and emitter follower stage (24); and a gain stage (26); a common emitter output of the joint common emitter and emitter follower stage (24) providing feedback to the emitter follower stage (22), and an emitter follower output of the joint common emitter and emitter follower stage (24) providing an input to the gain stage (26). | ||||||
| 198 | VARIABLE GAIN AMPLIFIER AND ITS CONTROL METHOD | PCT/JP2005018181 | 2005-09-30 | WO2007043122A9 | 2007-05-31 | ARAI TOMOYUKI |
| A variable gain amplifier comprises a first amplifier circuit (106), a gate bias control circuit (102), and a variable matching circuit (103). The first amplifier circuit (106) has a first field effect transistor and amplifies and outputs a signal received by the gate of the first field effect transistor. The gate bias control circuit (102) controls the gain of the first amplifier circuit by controlling the gate bias of the first amplifier circuit. The variable matching circuit (103) controls the gain of the first amplifier circuit by controlling a capacitor connected to the gate of the first amplifier circuit. | ||||||
| 199 | 위상변조 왜곡의 감소가 가능한 전력 증폭기 | KR1020170046897 | 2017-04-11 | KR1020180086105A | 2018-07-30 | 홍성철; 강승훈 |
| 진폭변조에의한위상변조왜곡을감소시킬수 있는전력증폭기가개시된다. 전력증폭기의입력단에양방향버랙터다이오드가병렬로연결된다. 동적버랙터다이오드제어부가전력증폭기의입력신호이용하여생성하는제어전압에기초하여양방향버랙터다이오드를실시간으로제어한다. 동적버랙터다이오드제어부는포락선신호를포함하는입력신호에서반송파성분을제거하여포락선신호를제어전압으로출력할수 있다. 전력증폭기의입력단과출력단에입력임피던스매칭회로와출력임피던스매칭회로가부가될수 있다. 변조왜곡보상전력증폭기의캐패시턴스는제어전압이감소함에따라또는입력신호가증가함에따라점점증가하다가감소하여위로볼록한형태를가질수 있다. 입력신호의증폭과정에서 AM 및 PM의왜곡을줄여주어선형성을향상시킬수 있다. | ||||||
| 200 | 짝수 고조파 신호를 포획하는 무메모리 능동 디바이스 | KR1020177001543 | 2015-06-19 | KR1020170023976A | 2017-03-06 | 아람파보드 |
| 능동디바이스및 능동디바이스와함께사용되는회로들이개시된다. 일양태에있어서, 능동디바이스는드레인, 게이트및 벌크를가진 n형트랜지스터와드레인, 게이트및 벌크를가진 p형트랜지스터를포함한다. n형트랜지스터와 p형트랜지스터는공통소스를포함한다. 디바이스는 n형트랜지스터의게이트와 p형트랜지스터의게이트사이에결합된제1 커패시터, n형트랜지스터의드레인과 p형트랜지스터의드레인사이에결합된제2 커패시터, 및 n형트랜지스터의벌크와 p형트랜지스터의벌크사이에결합된제3 커패시터를포함한다. 능동디바이스는높은항복전압을갖고메모리가없으며짝수고조파신호를포획한다. | ||||||
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