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1. 发明申请

US20180069518A1 AMPLIFIER SYSTEM AND METHOD FOR CONTROLLING AMPLIFIER 审中-公开
公开(公告)号：US20180069518A1
公开(公告)日：2018-03-08
申请号：US15800087
申请日：2017-11-01
申请人： MEDIATEK INC.
发明人： Lai-Ching Lin
IPC分类号： H03G3/30 , H03F3/193 , H03F3/21 , H03F3/45
CPC分类号： H03G3/3042 , H03F1/0272 , H03F3/193 , H03F3/21 , H03F3/245 , H03F3/45179 , H03F3/45475 , H03F2200/09 , H03F2200/18 , H03F2200/451 , H03F2200/456 , H03F2200/462 , H03F2200/481 , H03F2200/541 , H03F2200/75
摘要： An amplifier system includes a main amplifier, a cross-over current detector and a controller. The main amplifier includes at least a first driving transistor and a second driving transistor serving as a differential pair, wherein the first driving transistor and the second driving transistor are arranged to receive a first input signal and a second input signal, respectively. The cross-over current detector is coupled to the main amplifier, and is arranged for detecting a cross-over current of the main amplifier, wherein the cross-over current of the main amplifier is an overlapped current from the differential pair. The controller is coupled to the main amplifier and the cross-over current detector, and is arranged for generating a control signal to control a gain of the main amplifier according to an output of the main amplifier and the cross-over current of the main amplifier.

2. 发明授权

US09859986B2 Optical receiver, active optical cable, and control method for optical receiver 有权
公开(公告)号：US09859986B2
公开(公告)日：2018-01-02
申请号：US15170185
申请日：2016-06-01
申请人： FUJIKURA LTD.
发明人： Takayuki Tanaka , Minako Hayashi
IPC分类号： H01J40/14 , H04B10/69 , G01J1/44 , H03F3/08 , H03F3/45
CPC分类号： H04B10/697 , G01J1/44 , G01J2001/444 , H03F3/087 , H03F3/45475 , H03F3/45968 , H03F2200/375 , H03F2200/405 , H03F2200/453 , H03F2200/462 , H03F2200/481 , H03F2203/45152 , H03F2203/45212 , H04B10/69 , H04B10/695
摘要： The present disclosure includes a photodetector element (11) that converts an optical signal into an electric current signal; a transimpedance amplifier (12a) that converts the electric current signal into a voltage signal; a differential amplifier (12d) that converts the voltage signal into a differential signal, by performing differential amplification of a difference between the voltage signal and a threshold voltage; an LOS detection circuit that detects a no-signal section of the optical signal; and an MCU that repeatedly executes offset cancellation processing, the offset cancellation processing including threshold voltage change processing in which the threshold voltage is changed such that an offset voltage of the differential signal is reduced, the MCU 13 skipping the threshold voltage change processing in the no-signal section.

3. 发明授权

US09853613B2 Apparatus and methods for protecting radio frequency amplifiers from overdrive 有权
公开(公告)号：US09853613B2
公开(公告)日：2017-12-26
申请号：US15419431
申请日：2017-01-30
申请人： SKYWORKS SOLUTIONS, INC.
发明人： Anthony Francis Quaglietta
IPC分类号： H04B1/04 , H03F1/52 , H03F3/193 , H03F3/21 , H04B1/40
CPC分类号： H03F1/523 , H03F1/0261 , H03F3/193 , H03F3/195 , H03F3/21 , H03F3/245 , H03F3/72 , H03F2200/129 , H03F2200/27 , H03F2200/294 , H03F2200/321 , H03F2200/336 , H03F2200/411 , H03F2200/426 , H03F2200/451 , H03F2200/471 , H03F2200/481 , H03F2200/511 , H03F2200/516 , H03F2200/78 , H03F2203/7203 , H03F2203/7206 , H04B1/40
摘要： Provided herein are apparatus and methods for protecting radio frequency (RF) amplifiers from overdrive. In certain configurations, an RF amplification system includes a plurality of RF amplification stages including a first amplification stage and a second amplification stage subsequent to the first amplification stage in a signal path. The first amplification stage includes a first stage field-effect transistor (FET), and the second amplification stage includes a second stage FET and a gate-to-drain feedback circuit electrically connected between a gate and a drain of the second stage FET. The RF amplification system further includes an overdrive detection circuit that senses a drain current of the first stage FET to detect when an overdrive condition is present, and that decreases an impedance of the gate-to-drain feedback circuit in response to detection of the overdrive condition such that a gain of the second stage FET is reduced.

4. 发明授权

US09705465B2 Closed loop control system, and an amplifier in combination with such a closed loop control system 有权
公开(公告)号：US09705465B2
公开(公告)日：2017-07-11
申请号：US14464611
申请日：2014-08-20
申请人： ANALOG DEVICES GLOBAL
发明人： Rares Andrei Bodnar , Patrick Joseph Pratt , Donal Bourke , Peter James Tonge
IPC分类号： H03G3/30 , H03F3/21 , H03G3/00 , H03F3/193 , H03F1/30 , H03F1/32
CPC分类号： H03G3/3042 , H03F1/301 , H03F1/3205 , H03F3/193 , H03F3/21 , H03F2200/129 , H03F2200/144 , H03F2200/18 , H03F2200/451 , H03F2200/462 , H03F2200/481 , H03G3/001 , H03G3/3089
摘要： A control apparatus is provided that can provide high dynamic resolution and is suitable for inclusion within an integrated circuit. The control apparatus receives a demand signal representing a desired value of a measurand, and a feedback signal representing a present value or a recently acquired value of the measurand. The processing circuit forms a further signal a further signal which is a function of the demand and feedback signals. The further signal is then subjected to at least an integrating function. The demand signal, feedback signal or the further signal is processed or acquired in a sampled manner. The use of such sampled, i.e. discontinuous, processing allows integration time constants to be synthesized which would otherwise require the use of unfeasibly large components within an integrated circuit, or the use of off-chop components. Both of these other options are expensive.

5. 发明授权

US09461589B2 Asymmetric H-bridge in a class D power amplifier 有权
标题翻译： D类功率放大器中的非对称H桥
公开(公告)号：US09461589B2
公开(公告)日：2016-10-04
申请号：US14475822
申请日：2014-09-03
申请人： QUALCOMM Incorporated
发明人： Jingxue Lu , Ankit Srivastava , Haibo Fei
IPC分类号： H03F1/02 , H03F3/217 , H03F3/183 , H03F1/52 , H03F3/45
CPC分类号： H03F1/0205 , H03F1/523 , H03F3/183 , H03F3/217 , H03F3/2173 , H03F3/45179 , H03F3/45475 , H03F2200/03 , H03F2200/33 , H03F2200/351 , H03F2200/481
摘要： Disclosed is an amplifier circuit having an output stage that includes an H-bridge circuit. The H-bridge circuit includes sense resistors on one side of the circuit. A current detection circuit can produce an output indicative of current flow through a load based on voltages across the sense resistors.
摘要翻译：公开了具有包括H桥电路的输出级的放大器电路。 H桥电路包括电路一侧的检测电阻。电流检测电路可以基于感测电阻器两端的电压产生指示通过负载的电流的输出。

6. 发明授权

US09203347B2 Envelope tracking apparatus and method 有权
标题翻译：信封跟踪装置及方法
公开(公告)号：US09203347B2
公开(公告)日：2015-12-01
申请号：US14184397
申请日：2014-02-19
申请人： FutureWei Technologies, Inc.
发明人： Hong Jiang , Wael Al-Qaq , Matthew Kostelnik
IPC分类号： H03G3/00 , H03F3/04 , H03F1/02 , H03G3/30 , H03F3/19 , H03F3/21
CPC分类号： H03F1/0233 , H03F1/0222 , H03F3/19 , H03F3/21 , H03F3/2173 , H03F3/245 , H03F2200/102 , H03F2200/171 , H03F2200/451 , H03F2200/481 , H03G3/3036 , H03G3/3042
摘要： An apparatus comprises an amplifier having an input coupled to a radio frequency signal through a digital-to-analog circuit, an adaptive power supply having an output coupled to a bias voltage of the amplifier, wherein the output of the adaptive power supply is configured to have a shape similar to an envelope of the radio frequency signal and a feedback circuit comprising a sensing circuit and a mapping circuit, wherein the sensing circuit is configured to sense a current flowing from the adaptive power supply to the amplifier and sense the bias voltage of the amplifier, and wherein the mapping circuit is configured to sense the bias voltage of the amplifier, and wherein the mapping circuit is configured to generate a control signal for dynamically adjusting parameters of a low pass filter so as to stabilize the adaptive power supply.
摘要翻译：一种装置包括具有通过数模转换电路耦合到射频信号的输入的放大器，具有耦合到放大器的偏置电压的输出的自适应电源，其中自适应电源的输出被配置为具有类似于射频信号的包络的形状和包括感测电路和映射电路的反馈电路，其中感测电路被配置为感测从自适应电源流向放大器的电流并感测偏置电压放大器，并且其中所述映射电路被配置为感测所述放大器的偏置电压，并且其中所述映射电路被配置为生成用于动态调整低通滤波器的参数的控制信号，以便稳定所述自适应电源。

7. 发明授权

US09071201B2 Low dissipation amplifier 有权
标题翻译：低耗散放大器
公开(公告)号：US09071201B2
公开(公告)日：2015-06-30
申请号：US13848005
申请日：2013-03-20
申请人： Owen Jones , Lawrence R. Fincham
发明人： Owen Jones , Lawrence R. Fincham
IPC分类号： H03F3/68 , H03F3/21 , H03F1/02 , H03F1/32 , H03F1/34 , H03F1/52 , H03F3/187 , H03F3/30 , H03F3/45
CPC分类号： H03F3/211 , H03F1/0205 , H03F1/3217 , H03F1/34 , H03F1/52 , H03F3/187 , H03F3/21 , H03F3/3069 , H03F3/3076 , H03F3/45475 , H03F2200/129 , H03F2200/135 , H03F2200/144 , H03F2200/405 , H03F2200/408 , H03F2200/411 , H03F2200/426 , H03F2200/451 , H03F2200/462 , H03F2200/481 , H03F2200/504 , H03F2203/30031 , H03F2203/30033 , H03F2203/45512 , H03F2203/45526 , H03F2203/45528
摘要： A low dissipation, low distortion amplifier includes a driver amplifier stage and a main output stage, with a plurality of impedance networks providing, among other things, feedback paths from outputs of the driver and main output stages to the input of the driver stage. The impedance networks also provide coupling paths from the outputs of the driver and main output stages to the load. The impedance networks can all be formed of resistors, capacitors, or network combinations thereof. An additional feedback path can be added from the load to the driver stage to flatten out the frequency response at low frequencies. The driver and main output stages may be operated in Class AB and B modes respectively, and/or in Class G or H modes. An intermediate amplifier driver stage may be added between the driver and main output stages.
摘要翻译：低耗散低失真放大器包括驱动器放大器级和主输出级，多个阻抗网络尤其提供从驱动器和主输出级的输出到驱动器级的输入的反馈路径。阻抗网络还提供从驱动器和主输出级的输出到负载的耦合路径。阻抗网络都可以由电阻器，电容器或其网络组合形成。可以从负载向驱动器级添加额外的反馈路径，以在低频率下平坦化频率响应。驱动器和主输出级可以分别在AB类和B模式中和/或在G或H类模式下操作。可以在驱动器和主输出级之间添加中间放大器驱动器级。

8. 发明授权

US08963634B2 Load current sensing 有权
标题翻译：负载电流检测
公开(公告)号：US08963634B2
公开(公告)日：2015-02-24
申请号：US13406775
申请日：2012-02-28
申请人： Ankit Srivastava , Matthew D. Sienko , Meysam Azin , Xiaohong Quan , Peter J. Shah
发明人： Ankit Srivastava , Matthew D. Sienko , Meysam Azin , Xiaohong Quan , Peter J. Shah
IPC分类号： H03F3/04 , H03F3/217 , H03F1/04 , H03F99/00 , H03G3/20 , H03G11/00
CPC分类号： H03F3/2173 , H03F1/523 , H03F3/45179 , H03F3/45183 , H03F3/45475 , H03F2200/426 , H03F2200/462 , H03F2200/471 , H03F2200/481 , H03F2203/45522 , H03F2203/45526
摘要： Techniques for sensing current delivered to a load by a differential output stage, e.g., in a Class D amplifier. In one aspect, voltages across sense resistors coupled in series with first and second branches of the differential output stage are low-passed filtered and digitized. The sense resistors may be coupled in series with the sources of transistors of the first and second branches, wherein the transistors are selectively switchable on and off by input voltage driving voltages. The input driving voltages may correspond to a ternary voltage waveform such that during a given phase, the two transistors coupled in series with the sense resistors may be turned off. Further aspects provide for the first and second branches having cascoded NMOS and/or PMOS transistors, and the sense resistors being provided between a pair of cascoded transistors.
摘要翻译：用于感测由差分输出级（例如D类放大器）传送到负载的电流的技术。在一个方面，与差分输出级的第一和第二分支串联耦合的检测电阻之间的电压被低通滤波和数字化。感测电阻器可以与第一和第二分支的晶体管源串联耦合，其中晶体管可以通过输入电压驱动电压有选择地开关。输入驱动电压可以对应于三元电压波形，使得在给定相位期间，可以关断与感测电阻器串联耦合的两个晶体管。另外的方面提供具有级联的NMOS和/或PMOS晶体管的第一和第二分支，并且感测电阻器被提供在一对级联晶体管之间。

9. 发明授权

US08648623B2 High side current sense amplifier 有权
标题翻译：高边电流检测放大器
公开(公告)号：US08648623B2
公开(公告)日：2014-02-11
申请号：US13448161
申请日：2012-04-16
申请人： Hengsheng Liu , Edson Wayne Porter , Gregory Jon Manlove
发明人： Hengsheng Liu , Edson Wayne Porter , Gregory Jon Manlove
IPC分类号： G01R19/00
CPC分类号： G01R19/0092 , G01R1/203 , H03F1/26 , H03F3/393 , H03F3/45179 , H03F3/45632 , H03F2200/261 , H03F2200/462 , H03F2200/481 , H03F2203/45548
摘要： A single stage current sense amplifier is described that generates a differential output that is proportional to a current through a sense resistor. The voltage across the sense resistor is Vsense. The current sense amplifier includes a differential transconductance amplifier having high impedance input terminals. An on-chip RC filter filters transients in the Vsense signal. A feedback circuit for each leg of the amplifier causes a pair of input transistors to conduct a fixed constant current irrespective of Vsense, which stabilizes the transconductance. A gain control resistor (Re) is coupled across terminals of the pair of input transistors and has Vsense across it. The current through the gain control resistor is therefore Vsensex1/Re. A level shifting circuit coupled to each of the input transistors lowers a common mode voltage at an output of the amplifier. Chopper circuits at the input and output cancel any offset voltages.
摘要翻译：描述了单级电流检测放大器，其产生与通过检测电阻器的电流成比例的差分输出。检测电阻两端的电压为Vsense。电流检测放大器包括具有高阻抗输入端的差分跨导放大器。片内RC滤波器对Vsense信号中的瞬变进行滤波。放大器的每个支路的反馈电路使得一对输入晶体管能够导通固定的恒定电流，而与Vsense无关，这稳定跨导。增益控制电阻（Re）耦合在该对输入晶体管的端子之间，并且在其上具有Vsense。因此，通过增益控制电阻的电流为Vsensex1 / Re。耦合到每个输入晶体管的电平移动电路在放大器的输出处降低共模电压。输入和输出的斩波电路可以消除任何偏移电压。

10. 发明申请

US20120094727A1 POWER AMPLIFICATION CIRCUIT AND COMMUNICATION APPARATUS 审中-公开
标题翻译：功率放大电路和通讯设备
公开(公告)号：US20120094727A1
公开(公告)日：2012-04-19
申请号：US13148513
申请日：2010-10-08
申请人： Shigeru Morimoto , Kenichi Mori , Iwao Kojima , Kazuaki Takahashi , Mikihiro Shimada
发明人： Shigeru Morimoto , Kenichi Mori , Iwao Kojima , Kazuaki Takahashi , Mikihiro Shimada
IPC分类号： H04B1/38 , H04B1/04 , H03G3/20
CPC分类号： H03F1/0261 , H03F3/245 , H03F2200/408 , H03F2200/462 , H03F2200/465 , H03F2200/481 , H03F2200/516 , H03G3/004
摘要： Provided is a power amplification circuit capable of quickly and highly accurately preventing an output power and a current of a power amplifier from fluctuating when an antenna load changes. A power amplifier 11 amplifies a radio frequency signal and obtains an output signal. A regulator 12 amplifies an input voltage by a predetermined gain and supplies an output voltage to the power amplifier 11. A current monitor 13 monitors an input current to the regulator 12 and obtains a monitor current. A first multiplier 14 multiplies the monitor current by the output voltage of the regulator 12 and obtains a monitor power. A memory 16 prestores a predetermined reference current. A second multiplier 15 multiplies the input voltage by the reference current and obtains a reference power. A gain control section 121 in the regulator 12 controls a predetermined gain based on the monitor power and the reference power.
摘要翻译：提供了一种功率放大电路，其能够在天线负载变化时快速且高度准确地防止功率放大器的输出功率和电流波动。功率放大器11放大射频信号并获得输出信号。调节器12将输入电压放大预定的增益并将输出电压提供给功率放大器11.电流监视器13监视到调节器12的输入电流并获得监视电流。第一乘法器14将监视电流乘以调节器12的输出电压，并获得监视功率。存储器16预先存储预定的参考电流。第二乘法器15将输入电压乘以参考电流并获得参考功率。调节器12中的增益控制部分121基于监视功率和参考功率来控制预定增益。

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