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1. 发明申请

US20040104769A1 Amplifier 失效
标题翻译：放大器
公开(公告)号：US20040104769A1
公开(公告)日：2004-06-03
申请号：US10474719
申请日：2003-10-10
发明人： Eric Ronald Cheer
IPC分类号： H03F001/36
CPC分类号： H03F3/72 , H03F3/46 , H03F3/60 , H03F13/00
摘要： A re-circulating amplifier comprising a SAW filter with group delay characteristics for providing a time delay function.
摘要翻译：一种再循环放大器，包括具有组延迟特性的SAW滤波器，用于提供时间延迟功能。

2. 发明申请

US20040012440A1 Circuit and method for a transimpedance audio amplifier providing variable gain while maintaining load impedance 有权
公开(公告)号：US20040012440A1
公开(公告)日：2004-01-22
申请号：US10199623
申请日：2002-07-19
发明人： William Edward Hughes , Richard W. Faith
IPC分类号： H03F001/36
CPC分类号： H04R3/00 , H03G3/3005
摘要： A transimpedance amplifier (18) receives an audio signal from a power audio amplifier (14) and provides a variable power level to a loudspeaker (16). A first variable gain amplifier (28) receives the audio signal and provides a variable gain to a power amplifier (40). The output signal of the power amplifier drives the loudspeaker. A sense amplifier (52) subtracts a voltage representative of current flowing through the loudspeaker from a voltage applied to the loudspeaker and provides a difference signal. A second variable gain amplifier (70) receives the difference signal and provides a variable gain to a load amplifier (80). The gains of the first and second variable gain amplifiers are inversely proportional. A resistive element (84) having a real impedance is coupled between an output of the load amplifier and the input of the transimpedance amplifier to maintain the complex impedance of the loudspeaker at the output of the power audio amplifier.

3. 发明申请

US20030179039A1 Amplifying circuit capable of limiting amplitude of output signal supplied to a speaker 有权
标题翻译：能够限制提供给扬声器的输出信号幅度的放大电路
公开(公告)号：US20030179039A1
公开(公告)日：2003-09-25
申请号：US10244948
申请日：2002-09-17
发明人： Te-Yu Liang , Chien-Chih Yu
IPC分类号： H03F001/36
CPC分类号： H03F1/34 , H03F1/56 , H03F3/45475
摘要： In an amplifying circuit, an amplifier receives an input signal via a first resistor unit, and generates an output signal at an output thereof. A second resistor unit is connected between the output and input of the amplifier, and has at least one control input. The second resistor unit has a variable equivalent impedance that is controlled by a control signal received at the control input. A feedback control unit receives the output signal from the amplifier, and is operable so as to provide the control signal to the control input of the second resistor unit when the output signal does not fall within a voltage range defined by a predetermined low voltage and a predetermined high voltage to adjust the variable equivalent impedance of the second resistor unit.
摘要翻译：在放大电路中，放大器经由第一电阻器单元接收输入信号，并在其输出端产生输出信号。第二个电阻单元连接在放大器的输出和输入端之间，并具有至少一个控制输入。第二电阻器单元具有由控制输入端接收的控制信号控制的可变等效阻抗。反馈控制单元接收来自放大器的输出信号，并且可操作以便当输出信号不落在由预定低电压限定的电压范围内时，将控制信号提供给第二电阻器单元的控制输入，预定的高电压以调节第二电阻器单元的可变等效阻抗。

4. 发明申请

US20030058044A1 Amplifier improvements 有权
标题翻译：放大器改进
公开(公告)号：US20030058044A1
公开(公告)日：2003-03-27
申请号：US10237155
申请日：2002-09-06
发明人： Bruce Halcro Candy
IPC分类号： H03F001/36
CPC分类号： H03F1/083
摘要： An ultra-low distortion electronic amplifier wherein the global dominant pole is formed by the selection of circuit and component arrangement within the input stage, such that the global dominant pole, is of third order, at audio frequencies. This audio power amplifier implements a high order global dominant pole with the use of operational amplifiers, and this high order dominant pole is distributed across both the voltage amplification stage and input stage without adverse reduction in the slew rate. The amplifier has increased negative feedback at audio and ultrasonic frequencies, giving a reduction in distortion across the entire audio band and some of the lower ultrasonic band.
摘要翻译：一种超低失真电子放大器，其中全局主导极由输入级内的电路和分量布置的选择形成，使得全球主导极在音频处为三阶。该音频功率放大器使用运算放大器实现高阶全局主导极，而这个高阶主导极分布在电压放大级和输入级两端，而不会降低转换速率。放大器在音频和超声波频率上增加了负反馈，减少了整个音频频带和一些较低超声波频段的失真。

5. 发明申请

US20020168025A1 Multiple bandwidth amplifier control systems for mobile stations and methods therefor 有权
标题翻译：用于移动台的多带宽放大器控制系统及其方法
公开(公告)号：US20020168025A1
公开(公告)日：2002-11-14
申请号：US09854858
申请日：2001-05-14
发明人： Dale G. Schwent , Alexander W. Hietala
IPC分类号： H04K001/02 , H04L025/03 , H04L025/49 , H03F001/36
CPC分类号： H03G3/3047 , H03G1/0088
摘要： RF amplifier control circuits for transmitters in mobile communication devices, combinations thereof and methods therefor. The control circuits include generally proportional and integral control circuits having an output coupled to a control input of an amplifier. An initial control signal is applied to the amplifier before a vector modulator output coupled an input thereof is at full output power. The vector modulator output is ramped to full output after applying the initial control signal. Thereafter, the initial control signal applied to the amplifier during ramping is corrected by integrating an output of the amplifier relative to a second reference signal with an integral control circuit coupled to the control input of the amplifier, the second reference signal is proportional to the ramping vector modulator output.
摘要翻译：用于移动通信设备中的发射机的RF放大器控制电路，其组合及其方法。控制电路包括具有耦合到放大器的控制输入端的输出的通常成比例且整体的控制电路。在耦合其输入的矢量调制器输出处于全输出功率之前，将初始控制信号施加到放大器。施加初始控制信号后，向量调制器输出斜坡变为全输出。此后，通过将放大器的输出相对于第二参考信号与放大器的控制输入耦合的积分控制电路进行积分来校正在斜坡期间施加到放大器的初始控制信号，第二参考信号与斜坡成比例矢量调制器输出。

6. 发明申请

US20020021171A1 Low distortion amplifier 有权
标题翻译：低失真放大器
公开(公告)号：US20020021171A1
公开(公告)日：2002-02-21
申请号：US09915190
申请日：2001-07-24
发明人： Bruce Halcro Candy
IPC分类号： H03F001/36
CPC分类号： H03F3/3018 , H03F3/42 , H03F3/4517 , H03F2203/30078 , H03F2203/30111 , H03F2203/45566
摘要： An electronic amplifier providing very low distortion which includes an output stage with an output error correction stage containing two amplifiers and wherein there are at least four local negative feedback paths, an output of the first amplifier being connected to an input of output stage transistor buffers or output stage transistors through a first network, an output of the second amplifier being connected to an input of output stage transistor buffers or output stage transistors through a second network, where components of the first and second amplifier the local negative feedback paths, first and second networks and output stage transistor buffers are selected to form substantially second order local dominant pole. Also disclosed is the supply of power to said first and second amplifiers from a floating power supply means coupled to either an or the output of the output stage so that the voltage of the floating power supply will follow substantially an output voltage of the output stage.
摘要翻译：提供非常低失真的电子放大器，其包括具有包含两个放大器的输出误差校正级的输出级，并且其中存在至少四个局部负反馈路径，第一放大器的输出连接到输出级晶体管缓冲器的输入或输出级晶体管通过第一网络，第二放大器的输出端通过第二网络连接到输出级晶体管缓冲器或输出级晶体管的输入，其中第一和第二放大器的部件为局部负反馈路径，第一和第二网络和输出级晶体管缓冲器被选择以形成基本上二阶局部优势极。还公开了从耦合到输出级的输出或输出的浮动电源装置向所述第一和第二放大器供电，使得浮动电源的电压基本上将跟随输出级的输出电压。

7. 发明申请

US20040164797A1 Linear amplifier using non-linear cmos capacitors 有权
标题翻译：线性放大器采用非线性cmos电容
公开(公告)号：US20040164797A1
公开(公告)日：2004-08-26
申请号：US10480354
申请日：2003-09-12
发明人： Martin Reber
IPC分类号： H03F001/36
CPC分类号： H03F3/45941 , H03F1/086 , H03F2200/331
摘要： The invention provides an amplifier circuit made by digital CMOS processes, the amplifier circuit comprising a main operational amplifier with at least one input and at least one output and a feedback loop including a non-linear gateoxide capacitor, wherein a voltage control means is connected to the main operational amplifier to provide a voltage difference between the output common mode voltage and the input common mode voltage of the main operational amplifier to apply a DC biasing voltage across the non-linear gateoxide capacitor sufficient to operate the non-linear gateoxide capacitor in a bias range where the capacity of the none-linear gateoxide capacitor is almost independent of the applied voltage comprising the bias voltage plus a signal voltage.
摘要翻译：本发明提供一种由数字CMOS工艺制成的放大器电路，放大器电路包括具有至少一个输入和至少一个输出的主运算放大器和包括非线性栅极氧化物电容器的反馈回路，其中电压控制装置连接到主运算放大器提供输出共模电压和主运算放大器的输入共模电压之间的电压差，以跨越非线性栅极氧化物电容器施加足够的直流偏置电压，以在非线性栅极电容器中操作偏置范围，其中非线性栅极电容器的容量几乎与包括偏置电压加上信号电压的施加电压无关。

8. 发明申请

US20040113685A1 DC offset cancellation techniques 有权
公开(公告)号：US20040113685A1
公开(公告)日：2004-06-17
申请号：US10318630
申请日：2002-12-13
发明人： Clndra Wldya Abidin , Georgios S. Asmanis
IPC分类号： H03F001/36
CPC分类号： H03F3/45973
摘要： The present invention includes an offset cancellation device having input return loss characteristics suitable for high frequency operation.

9. 发明申请

US20030151458A1 Transimpedance amplifier and circuit including the same 有权
标题翻译：跨阻放大器和电路包括相同
公开(公告)号：US20030151458A1
公开(公告)日：2003-08-14
申请号：US10359155
申请日：2003-02-06
发明人： Robert M. Smith , C. Phillip McClay , Robert T. Carroll
IPC分类号： H03F001/36
CPC分类号： H03F3/3432 , H03F3/345 , H03F2203/45544 , H03F2203/45594 , H03F2203/45654
摘要： Disclosed is a four stage transimpedance amplifier having a grounded base transistor preamplifier input stage, a common emitter voltage amplifier stage, and an amplifier stage having a common collector transistor, an output buffer stage, and a bias circuit coupled to the preamplifier stage to prevent the grounded base transistor from going into saturation.
摘要翻译：公开了一种具有接地的基极晶体管前置放大器输入级，公共发射极电压放大器级和具有公共集电极晶体管，输出缓冲级和耦合到前置放大器级的偏置电路的放大器级的四级跨阻抗放大器，以防止接地的基极晶体管进入饱和。

10. 发明申请

US20030151457A1 Feed forward RF power amplifier with high efficiency main amplifier and highly linear error amplifier 有权
标题翻译：具有高效率主放大器和高线性误差放大器的前馈射频功率放大器
公开(公告)号：US20030151457A1
公开(公告)日：2003-08-14
申请号：US10365111
申请日：2003-02-12
发明人： Mark Gurvich , Ezmarai Arbab , Bill Vassilakis
IPC分类号： H03F001/36
CPC分类号： H03F1/3235
摘要： A feed forward RF power amplifier which provides both high efficiency and minimal distortion in broad bandwidth RF applications. The feed forward power amplifier includes a main amplifier biased to provide high efficiency and an error amplifier biased to provide highly linear operation through substantially the entire operating range. Signal peaks which introduce distortion components at the main amplifier output are cancelled by the linear operation of the error amplifier.
摘要翻译：前馈射频功率放大器，可在宽带宽RF应用中提供高效率和最小失真。前馈功率放大器包括偏置以提供高效率的主放大器和偏置的误差放大器，以在基本上整个工作范围内提供高度线性的操作。在主放大器输出处引入失真分量的信号峰值被误差放大器的线性运算所抵消。

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