子分类：
- H03F1/02： .为提高效率对放大器的改进,例如滑动甲类放大级,采用辅助振荡
- H03F1/08： .为减少放大元件内阻的有害影响对放大器的改进(具有包括这些阻抗的级间耦合网络的宽带放大器入H03F1/42;消除真空管中电子渡越时间效应的入H01J21/34)
- H03F1/26： .为减少由放大元件产生的噪声的影响,对放大器的改进
- H03F1/30： .为减少温度变化或电源电压变化的影响{或其他物理参数 (差分放大器入H03F3/45479)},对放大器的改进
- H03F1/32： .为减少非线性失真对放大器的改进(用负反馈的入H03F1/34)
- H03F1/34： .有或无正反馈的负反馈电路装置(H03F1/02至H03F1/30;H03F1/38至H03F1/50,H03F3/50优先;用于抑制公共模式信号的入 H03F3/45479)
- H03F1/38： .无负反馈的正反馈电路装置
- H03F1/42： .为扩展带宽对放大器的改进
- H03F1/52： .保护此类放大器用的电路装置{(监控装置入 G01R31/28;增加通信系统可靠性的,例如使用冗余的,入H04B1/74)}
- H03F1/56： .其他类不包含的输入或输出阻抗的改进
| 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 | High efficiency amplification | US12360727 | 2009-01-27 | US08169261B2 | 2012-05-01 | Martin Paul Wilson |
| A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and means for generating an adjusted selected power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage. | ||||||
| 62 | High Efficiency Amplification | US12360727 | 2009-01-27 | US20090128236A1 | 2009-05-21 | Martin Paul Wilson |
| A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and means for generating an adjusted selected power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage. | ||||||
| 63 | High efficiency amplification | US11161854 | 2005-08-19 | US07482869B2 | 2009-01-27 | Martin Paul Wilson |
| A radio frequency amplification stage including an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, including a circuit for providing a reference signal representing the envelope of the input signal; a circuit for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and a circuit for generating an adjusted selected power supply voltage, including an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage. | ||||||
| 64 | METHOD AND CIRCUITRY FOR MULTI-STAGE AMPLIFICATION | EP14848224 | 2014-09-30 | EP3078115A4 | 2017-07-26 | SANKARAN SWAMINATHAN; KRAMER BRADLEY ALLEN; ALI HASSAN; WARKE NIRMAL C |
| 65 | DC blocker for a high gain amplifier circuit | EP13159519.1 | 2013-03-15 | EP2779438B1 | 2016-10-26 | Rievers, Søren; Prummel, Jan Geert |
| 66 | CURRENT MIRROR WITH SATURATED SEMICONDUCTOR RESISTOR | EP13798518.0 | 2013-11-19 | EP2936263A1 | 2015-10-28 | BETTENCOURT, John, P.; DECARO, Frank, J.; TREMBLAY, John, C. |
| A current mirror circuit having formed in a semiconductor: a pair of transistors arranged to produce an output current through an output one of the transistors proportional to a reference current fed to an input one of the pair of transistors; a resistor comprising a pair of spaced electrodes in ohmic contact with the semiconductor, one of such pair of electrodes of the resistor being coupled to the input one of the pair of transistors; and circuitry for producing a voltage across the pair of electrodes of the resistor, such circuitry placing the resistor into saturation producing current through a region in the semiconductor between the pair of spaced ohmic contacts, such produced current being fed to the input one of the transistors as the reference current for the current mirror. | ||||||
| 67 | SYSTEMS AND METHODS PROVIDING ADAPTIVE POWER TRACKING | US15472943 | 2017-03-29 | US20180124716A1 | 2018-05-03 | Sudarsan Krishnan; Andrei Izotov; Carl Hardin; Vijay Chellappa; Li Gao |
| A radio frequency (RF) system including: a modem configured to generate a first set of digital bits and to create an analog RF signal from those digital bits; a power amplifier configured to receive the analog RF signal and to amplify the analog RF signal, the power amplifier including an input for a biasing voltage; a feedback loop configured to sample an output of the power amplifier, generate a second set of digital bits corresponding to the first set of digital bits, digitally process the second set of digital bits to determine a linearity characteristic of the power amplifier, and to adjust the biasing voltage in response to determining the linearity characteristic. | ||||||
| 68 | CORRECTION DEVICE, CORRECTION METHOD, AND MAGNETIC RESONANCE IMAGING APPARATUS | US15693322 | 2017-08-31 | US20180100909A1 | 2018-04-12 | Shinji TAKAKURA; Shigen YASUNAKA |
| According to one embodiment, a correction device is used for an apparatus including a coil and a conductor in a vicinity of the coil. The correction device corrects an influence of a magnetic field generated by the conductor when a current flows through the coil. The correction device includes a first measuring device, a second measuring device, and a control device. The first measuring device measures a first signal of the coil. The second measuring device measures a second signal of the coil, which is different from the first signal. The control device estimates the influence acting on the coil, based on a difference between the first signal filtered by a first filter and the second signal filtered by a second filter. Furthermore, the control device controls a command signal for flowing the current to the coil, based on an estimation result of the influence. | ||||||
| 69 | High impedance compliant probe tip | US14587703 | 2014-12-31 | US09810715B2 | 2017-11-07 | Julie A. Campbell; Ira G. Pollock; William A. Hagerup; Christina D. Enns |
| A test probe tip can include a compliance member or force deflecting assembly and a tip component. The compliance member or force deflecting assembly can include a plunger component and a barrel component to receive the plunger component, wherein the plunger component is configured to slide axially inside the barrel component. The test probe tip can also include a spring mechanism within the barrel component to act on the plunger component, and a resistive/impedance element, e.g., a round rod resistor, coupled with the plunger component at one end and with the tip component at the opposite end. | ||||||
| 70 | MEMS device front-end charge amplifier | US13857349 | 2013-04-05 | US09444404B2 | 2016-09-13 | Ion Opris; Hai Tao; Shungneng Lee |
| This document discusses, among other things, apparatus and methods for a front-end charge amplifier. In certain examples, a front-end charge amplifier for a microelectromechanical system (MEMS) device can include a charge amplifier configured to couple to the MEMS device and to provide sense information of a proof mass of the MEMS device, a feedback circuit configured to receive the sense information and to provide feedback to an input of the charge amplifier, and wherein the charge amplifier includes a transfer function having a first pole at a first frequency, a second pole at a second frequency, and one zero at a third frequency. | ||||||
| 71 | HIGH IMPEDANCE COMPLIANT PROBE TIP | US14587703 | 2014-12-31 | US20160187382A1 | 2016-06-30 | Julie A. Campbell; Ira G. Pollock; William A. Hagerup; Christina D. Enns |
| A test probe tip can include a compliance member or force deflecting assembly and a tip component. The compliance member or force deflecting assembly can include a plunger component and a barrel component to receive the plunger component, wherein the plunger component is configured to slide axially inside the barrel component. The test probe tip can also include a spring mechanism within the barrel component to act on the plunger component, and a resistive/impedance element, e.g., a round rod resistor, coupled with the plunger component at one end and with the tip component at the opposite end. | ||||||
| 72 | Method and circuitry for multi-stage amplification | US14066980 | 2013-10-30 | US09143100B2 | 2015-09-22 | Swaminathan Sankaran; Bradley Allen Kramer; Hassan Ali; Nirmal C. Warke |
| In an amplifier, a first stage receives a differential input voltage, which is formed by first and second input voltages, and outputs a first differential current in response thereto on first and second lines having respective first and second line voltages. A second stage receives the first and second line voltages and outputs a second differential current in response thereto on third and fourth lines having respective third and fourth line voltages. A transformer includes first and second coils. A first terminal of the first coil is coupled through a first resistor to the first line. A second terminal of the first coil is coupled through a second resistor to the second line. A first terminal of the second coil is coupled through a third resistor to the third line. A second terminal of the second coil is coupled through a fourth resistor to the fourth line. | ||||||
| 73 | High Efficiency Amplification | US14636387 | 2015-03-03 | US20150194933A1 | 2015-07-09 | Martin Paul Wilson |
| A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and means for generating an adjusted selected power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage. | ||||||
| 74 | Amplifier and switch configured as multiplexor | US14482962 | 2014-09-10 | US09065384B1 | 2015-06-23 | Robert L. Blair; Hu Jing Yao; Dustin Dale Forman; A. Martin Mallinson |
| A system and method is disclosed for selecting between two electronic signals, one of high quality, such as music audio, and the other of low quality, such as telephone call audio, in a smart phone, tablet or other device. In one embodiment, when the low quality signal is to be used this is accomplished by disabling the amplifier output to disconnect the high quality audio signal from the output port, rather than by means of a switch between the amplifier and the output port as in the prior art. This eliminates degradation of the signal due to the switch when the high quality signal is to be used. The amplifier typically has an associated feedback resistor network, and this may also be disconnected by means of a switch when the low quality signal is to be used, thus preventing distortion of the low quality signal due to the feedback network being a parallel load to the output port. | ||||||
| 75 | RF POWER AMPLIFIER AND OPERATING METHOD THEREOF | US14604944 | 2015-01-26 | US20150137894A1 | 2015-05-21 | Masatoshi HASE |
| A multiband RF power amplifier includes a first band RF amplifier circuit, a second band RF amplifier circuit and a second band power detection circuit. The second band RF amplifier circuit subjects an RF input signal having a frequency band to power amplification and generates an RF amplifier output signal. The input terminal of the second band power detection circuit is coupled to the output of the second band RF amplifier circuit. The second band power detection circuit detects a harmonic component that is a whole number multiple of a fundamental wave component of the RF amplifier output signal, and generates a detected signal indicating the fundamental wave component. The second band power detection circuit includes an input circuit, which detects the harmonic component, and an output circuit, which generates the detected signal. | ||||||
| 76 | METHOD AND CIRCUITRY FOR MULTI-STAGE AMPLIFICATION | US14066980 | 2013-10-30 | US20150091642A1 | 2015-04-02 | Swaminathan Sankaran; Bradley Allen Kramer; Hassan Ali; Nirmal C. Warke |
| In an amplifier, a first stage receives a differential input voltage, which is formed by first and second input voltages, and outputs a first differential current in response thereto on first and second lines having respective first and second line voltages. A second stage receives the first and second line voltages and outputs a second differential current in response thereto on third and fourth lines having respective third and fourth line voltages. A transformer includes first and second coils. A first terminal of the first coil is coupled through a first resistor to the first line. A second terminal of the first coil is coupled through a second resistor to the second line. A first terminal of the second coil is coupled through a third resistor to the third line. A second terminal of the second coil is coupled through a fourth resistor to the fourth line. | ||||||
| 77 | ABSORPTIVE RF RECTIFIER CIRCUIT | US13927800 | 2013-06-26 | US20150003131A1 | 2015-01-01 | Ky-Hien DO; Peter KURING |
| A radio frequency rectifier circuit may include a resistive termination to circuit ground, a plurality of inductors, and at least a first pair of rectifier components. The plurality of inductors may be connected electrically in series between an input node for receiving an input RF signal and the resistive termination. Each pair of electrically adjacent inductors of the plurality of inductors may be connected together at a respective in-line node. The first pair of rectifier components may electrically couple a first one of the in-line nodes to a respective direct current output node. Each rectifier component may have a cathode and an anode. A first rectifier component of the first pair of rectifier components may have the cathode electrically connected to the first in-line node and a second rectifier component of the first pair of rectifier components may have the anode electrically connected to the first in-line node. | ||||||
| 78 | Multiple winding transformer coupled amplifier | US13736028 | 2013-01-07 | US08912845B2 | 2014-12-16 | Edward Perry Jordan |
| An integrated circuit includes a radio frequency (RF) amplifier having a trifilar transformer coupled to a gain device in two negative feedback paths. The trifilar transformer includes a first winding, a second winding and a third winding, a first dielectric core is disposed between the first winding and the second winding, and a second dielectric core is disposed between the second winding and the third winding. A first winding ratio between the first winding and the second winding combined with a second winding ratio between the second winding and the third winding affects a total gain of the RF amplifier. In a specific embodiment, the gain device is a transistor, the first winding is coupled to a base of the transistor, the second winding is coupled to a collector of the transistor, and the third winding is coupled to an emitter of the transistor. | ||||||
| 79 | SYSTEMS AND METHODS FOR IMPEDANCE SWITCHING | US13831312 | 2013-03-14 | US20140197900A1 | 2014-07-17 | Shriram KALUSALINGAM; Massimo BRANDOLINI |
| Systems and methods for switching impedance are provided. In some aspects, a system includes first and second impedance elements and an impedance switch module, which includes a third impedance element coupled between the first and second impedance elements and a switch parallel to the third impedance element. The switch is coupled between the first and second impedance elements, and is configured to switch between an open configuration and a closed configuration. An electrical path is completed between the first impedance element and the second impedance element via the first switch in the closed configuration. The electrical path is not completed in the open configuration. A total impedance of the first impedance element, the second impedance element, and the impedance switch module is varied based on the switching between the open configuration and the closed configuration. | ||||||
| 80 | Control signal generation circuit and sense amplifier circuit using the same | US13730292 | 2012-12-28 | US08779800B2 | 2014-07-15 | Yin Jae Lee |
| A control signal generation circuit includes a voltage detection unit which detects a level of an external voltage and generates first and second detection signals and a control signal control unit which delays a sense amplifier enable signal in response to the first and second detection signals and generates first through third control signals. The enable period of the first and second control signals are controlled based on the levels of the first and second detection signals. | ||||||
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