公开(公告)号：US06417732B1

公开(公告)日：2002-07-09

申请号：US09827723

申请日：2001-04-06

申请人： Aaron T. Radomski ,  Kevin P. Nasman

发明人： Aaron T. Radomski ,  Kevin P. Nasman

IPC分类号： H03F2100

CPC分类号： H03F3/21 ,  H03F1/345 ,  H03F1/52 ,  H03F3/189

摘要： A radio frequency (RF) power generator system includes a power generator that generates a RF power signal that is output to a load. The RF generator generates a forward power feedback signal and a reverse power feedback signal. A controller receives the forward power feedback signal and the reverse power feedback signal. The controller generates a setpoint signal that is output to the power generator. A setpoint modifier receives the forward feedback signal, the reverse feedback signal and an external setpoint signal. The setpoint modifier calculates a forward power limit based on the forward and reverse power feedback signals. The setpoint modifier and outputs a modified setpoint signal to the controller based on one of the forward power limit and the external setpoint signal. The setpoint modifier and the controller can be integrated.

摘要翻译： 射频（RF）发电机系统包括产生输出到负载的RF功率信号的发电机。 RF发生器产生正向功率反馈信号和反向功率反馈信号。 控制器接收正向功率反馈信号和反向功率反馈信号。 控制器产生输出到发电机的设定值信号。 设定值修正器接收正向反馈信号，反向反馈信号和外部设定点信号。 设定值修正器根据正向和反向功率反馈信号计算正向功率限制。 设定值修正器，并根据正向功率限制和外部设定点信号之一向控制器输出修改的设定值信号。 设定值调节器和控制器可以集成。

公开(公告)号：US06351184B1

公开(公告)日：2002-02-26

申请号：US09624506

申请日：2000-07-24

申请人： Guoqing Miao ,  Cary L. Delano

发明人： Guoqing Miao ,  Cary L. Delano

IPC分类号： H03F2100

CPC分类号： H03F3/2171

摘要： A switching amplifier is described which includes an input stage having a first node associated therewith and a power stage having a second node associated therewith. An actual loop delay is defined with reference to the first and second nodes. Delay detection circuitry compares the actual loop delay to a reference loop delay. A dynamic delay line controlled by the delay detection circuitry controls the actual loop delay to correspond to the reference loop delay.

摘要翻译： 描述了一种开关放大器，其包括具有与其相关联的第一节点的输入级和具有与其相关联的第二节点的功率级。 参考第一和第二节点定义实际的环路延迟。 延迟检测电路将实际环路延迟与参考环路延迟进行比较。 由延迟检测电路控制的动态延迟线控制实际的环路延迟以对应于参考环路延迟。

公开(公告)号：US06792121B2

公开(公告)日：2004-09-14

申请号：US09832994

申请日：2001-04-12

申请人： Yasuyuki Koyama ,  Masanori Fujisawa

发明人： Yasuyuki Koyama ,  Masanori Fujisawa

IPC分类号： H03F2100

CPC分类号： H03F3/3094 ,  H03F1/083 ,  H03F3/45085

摘要： An audio signal amplifier circuit includes an external output terminal of an IC to which an output line of a power amplifier circuit is connected, a first resistor connected between a certain terminal of the IC other than the external output terminal and a feedback input of a differential amplifier circuit, a first capacitor connected between the external output terminal and a loud speaker, a second capacitor between the certain terminal of the IC and a wiring line between the external output terminal and the loud speaker, a filter circuit provided on a signal input side of the differential amplifier circuit and including a second resistor and a third capacitor for attenuating signal components having frequencies in a middle and high frequency ranges and voltage follower means provided between an input stage and an output stage of the audio signal amplifier circuit, wherein the first capacitor is a small capacitor having a capacitance value in the order of 30 &mgr;F or smaller and an attenuation characteristics of the first capacitor and an impedance of the loud speaker in a low frequency range is compensated for by a relative amount of increase of amplification gain in the low frequency range determined by a time constant of the second capacitor and the first resistor and a time constant of the third capacitor and the second resistor.

摘要翻译： 音频信号放大器电路包括连接功率放大器电路的输出线的IC的外部输出端子，连接在IC外部某一端子之外的第一电阻器和外部输出端子的反馈输入端 放大器电路，连接在外部输出端子和扬声器之间的第一电容器，IC的特定端子之间的第二电容器和外部输出端子与扬声器之间的布线;滤波电路，设置在信号输入侧 并且包括用于衰减具有中频高频范围的频率的信号分量的第二电阻器和第三电容器，以及设置在音频信号放大器电路的输入级和输出级之间的电压跟随器装置，其中第一 电容器是具有大约30μm或更小的电容值的电容器和一个电容器 在第二电容器和第一电阻器的时间常数确定的低频范围内的放大增益的相对增加量相对于第一电容器的噪声特性和扬声器在低频范围内的阻抗被补偿， 第三电容器和第二电阻器的时间常数。

公开(公告)号：US06577187B1

公开(公告)日：2003-06-10

申请号：US09594664

申请日：2000-06-15

申请人： Matthew M. Lesko

发明人： Matthew M. Lesko

IPC分类号： H03F2100

CPC分类号： H03F3/45085 ,  H03F1/30 ,  H03F3/45475 ,  H03F3/45959 ,  H03F3/45991 ,  H03F2203/45371 ,  H03F2203/45591 ,  H03F2203/45688

摘要： A powered transducer preamplifier includes a preamplifier circuit that DC couples the preamplifier input with the preamplifier output. A biasing circuit is coupled to the preamplifier input to apply a bias voltage to power the transducer, and a DC level shifting circuit is DC coupled to the signal path of the preamplifier circuit between the input and the output to compensate for this bias voltage. The DC level shifting circuit avoids the use of reactive components, and thereby reduces phase distortion. A variety of DC level shifting circuits can be used, including a bridge circuit having four matched resistors and an inverter DC coupled between the nodes of the bridge.

摘要翻译： 一个供电的传感器前置放大器包括前置放大器电路，其将前置放大器输入端与前置放大器输出相耦合。 偏置电路耦合到前置放大器输入以施加偏置电压来为换能器供电，并且直流电平移位电路被直流耦合到输入和输出之间的前置放大器电路的信号路径，以补偿该偏置电压。 DC电平移位电路避免使用无功分量，从而减少相位失真。 可以使用各种DC电平移位电路，包括具有四个匹配电阻器的桥式电路和耦合在桥接器节点之间的逆变器DC。

公开(公告)号：US06529073B1

公开(公告)日：2003-03-04

申请号：US09565726

申请日：2000-05-05

申请人： John H. Highfill, III ,  Matthew K. Ferguson ,  Jeffrey Cranmer

发明人： John H. Highfill, III ,  Matthew K. Ferguson ,  Jeffrey Cranmer

IPC分类号： H03F2100

CPC分类号： H03F3/2173 ,  H03F1/523 ,  H03F3/2171

摘要： Over-voltage protection circuits are provided for power supplies that may limit input voltage spikes to a power converter and amplifiers including a damping loop that may damp filter resonance. Active damping systems incorporating the over-voltage protection circuits and/or damping loops of the present invention are also provided which may be particularly advantageous in applications such as aircraft or other vehicle applications where size and power consumption are important design considerations. The over-voltage protection circuit in various embodiments senses AC and/or DC voltage levels above a detection threshold level and momentarily disconnects the voltage input to thereby reduce the maximum voltage level input transients seen by the power converter. A capacitor may be provided to maintain the input voltage to the power converter while the input is switched out. The amplifier circuit damping loop in various embodiments is nested with a control circuit current feedback loop which may compensate for feedback problems such as instability which may result when an inductor-capacitor-inductor (L-C-L) filter is included on the output of the amplifier.

摘要翻译： 为电源提供过电压保护电路，可将输入电压尖峰限制到功率转换器和放大器，包括阻尼滤波器谐振的阻尼回路。 还提供了结合本发明的过电压保护电路和/或阻尼环的主动阻尼系统，其在尺寸和功率消耗是重要设计考虑的诸如飞行器或其它车辆应用的应用中可能是特别有利的。 在各种实施例中的过电压保护电路感测到高于检测阈值电平的AC和/或DC电压电平并且暂时断开电压输入，从而减小由功率转换器所看到的最大电压电平输入瞬变。 可以提供电容器以在输入被切换时将输入电压维持到功率转换器。 各种实施例中的放大器电路阻尼回路嵌套有控制电路电流反馈回路，其可以补偿在放大器的输出上包括电感器 - 电容器 - 电感器（L-C-L）滤波器时可能导致的反馈问题，例如不稳定性。

公开(公告)号：US06809597B2

公开(公告)日：2004-10-26

申请号：US10400105

申请日：2003-03-26

申请人： Glenn Keiji Murata

发明人： Glenn Keiji Murata

IPC分类号： H03F2100

CPC分类号： H03D13/003 ,  H03L7/087 ,  H03L7/091 ,  H03L7/18 ,  H03L2207/06

摘要： A phase comparison circuit for generating control voltages for a number of varactors of a phase locked loop (PLL) circuit has been disclosed. According to a particular embodiment, a number of phase difference detection circuits (101, 102 and 103) can be successively activated in response to a set of activation signals to generate output voltage signals (Vtunei). Output voltage signals (Vtunei) can vary according to an elapsed period time, and thus represent a phase difference. Each phase difference detection circuit (101, 102 and 103) can activate a trigger signal (Trg) when an internal voltage signal equals a predetermined value. A main signal (SIG) can be input as an activation signal to a first stage phase difference detection circuit (101). A trigger signal from a first stage phase difference detection circuit (101) can be input as an activation signal to a subsequent stage phase difference detection circuit (102). Phase difference detection circuits (101, 102 and 103) can be deactivated in response to an output signal (out) generated in response to a reference signal (REF), and provide output voltages (Vtunei) which can represent a phase difference between reference signal (REF) and a main signal (SIG).

摘要翻译： 已经公开了用于产生多个锁相环（PLL）电路的变容二极管的控制电压的相位比较电路。 根据特定实施例，可以响应于一组激活信号连续激活多个相位差检测电路（101,102和103），以产生输出电压信号（Vtunei）。 输出电压信号（Vtunei）可以根据经过的周期时间而变化，因此表示相位差。 当内部电压信号等于预定值时，每个相位差检测电路（101,102和103）可激活触发信号（Trg）。 可以将主信号（SIG）作为激活信号输入到第一级相位差检测电路（101）。 可以将来自第一级相位差检测电路（101）的触发信号作为激活信号输入到后级相位差检测电路（102）。 相位差检测电路（101,102和103）可响应于响应于参考信号（REF）产生的输出信号（out）而被去激活，并且提供输出电压（Vtunei），其可以表示参考信号 （REF）和主信号（SIG）。

公开(公告)号：US06653899B2

公开(公告)日：2003-11-25

申请号：US09882999

申请日：2001-06-15

申请人： Juan H. Organvidez ,  Felix C. Quintanar

发明人： Juan H. Organvidez ,  Felix C. Quintanar

IPC分类号： H03F2100

CPC分类号： H03F1/52 ,  H03F3/3076 ,  H03F3/68

摘要： An audio amplifier power and temperature controller and associated method are provided which preferably includes a power receiving circuit for receiving power from a power source to an audio amplifier and a power condition switching control circuit responsive to the power receiving means for switching components of an audio amplifier during a plurality of power conditions. The power condition switching control circuit preferably includes a network detecting circuit responsive to the power receiving circuit for detecting network conditions, a thermal status monitoring and controlling circuit for monitoring thermal status of audio amplifier components and responsively decreasing power to the audio amplifier components to protect the audio amplifier components against damage caused by excess heat and for responsively increasing power when the audio amplifier components return to normal thermal operating conditions, and an audio power sensing and processing circuit responsive to the power receiving circuit for monitoring audio power input conditions to the audio amplifier to enhance source output and to reduce or eliminate noise such as due to other components within a network system.

公开(公告)号：US06631195B1

公开(公告)日：2003-10-07

申请号：US09172559

申请日：1998-10-14

申请人： Eric K. Pritchard

发明人： Eric K. Pritchard

IPC分类号： H03F2100

CPC分类号： H03F3/181

摘要： Speaker attenuation for practicing a musical instrument is a filter means connected between an amplifier and a speaker for providing greater treble attenuation than bass attenuation to compensate for bass hearing loss at attenuated sound levels. The reduction of load created by the attenuator is compensated by a load means.

摘要翻译： 用于练习乐器的扬声器衰减是连接在放大器和扬声器之间的滤波器装置，用于提供比低音衰减更高的高音衰减以补偿衰减声级的低音听力损失。 由衰减器产生的负载减小由负载装置补偿。

公开(公告)号：US06297697B2

公开(公告)日：2001-10-02

申请号：US09759005

申请日：2001-01-11

申请人： Cary L. Delano ,  Adya S. Tripathi

发明人： Cary L. Delano ,  Adya S. Tripathi

IPC分类号： H03F2100

CPC分类号： H03F3/217 ,  H03F3/2171 ,  H03F3/2175 ,  H03F3/72 ,  H03F2200/331

摘要： A signal processing circuit and method for processing an input signal are described. The circuit includes a frequency selective network, an amplification stage, and at least one continuous-time feedback path from the output of the amplification stage to the frequency selective network. The amplification stage includes a switching amplifier and an analog amplifier. Switching circuitry alternately enables the switching and analog amplifiers for processing of the input signal.

公开(公告)号：US06798288B1

公开(公告)日：2004-09-28

申请号：US09963874

申请日：2001-09-25

申请人： Arun Jayaraman ,  Cary L. Delano

发明人： Arun Jayaraman ,  Cary L. Delano

IPC分类号： H03F2100

CPC分类号： H03F3/2175 ,  H03F2200/294 ,  H03F2200/372

摘要： A bandpass amplifier for use in a communication system is described. The amplifier includes a frequency selective network having a feedback path. The frequency selective network has first filtering circuitry for selectively passing the transmit band, and second filtering circuitry for selectively passing the receive band. The first filtering circuitry and the second filtering circuitry pass frequencies in the transmit band and reject frequencies in the receive band. A sampling analog-to-digital converter is coupled to the frequency selective network. A switching device is coupled to the sampling analog-to-digital converter for producing a continuous-time output signal. A feedback path is provided for continuously sensing and feeding back the continuous-time output signal to the frequency selective network.

摘要翻译： 描述用于通信系统的带通放大器。 放大器包括具有反馈路径的频率选择网络。 频率选择网络具有用于选择性地通过发射频带的第一滤波电路和用于选择性地通过接收频带的第二滤波电路。 第一滤波电路和第二滤波电路通过发送频带中的频率并拒绝接收频带中的频率。 采样模数转换器耦合到频率选择网络。 开关器件耦合到采样模数转换器，用于产生连续时间输出信号。 提供反馈路径用于连续感测并将连续时间输出信号反馈到频率选择网络。