公开(公告)号：US5745469A

公开(公告)日：1998-04-28

申请号：US805726

申请日：1997-02-25

申请人： Chun-Sup Kim ,  Yong-Serk Kim

发明人： Chun-Sup Kim ,  Yong-Serk Kim

IPC分类号： G11B19/00 ,  G11B7/00 ,  G11B7/005 ,  G11B20/10 ,  H03G3/30

CPC分类号： H03G3/3005 ,  G11B20/10009

摘要： A preamplifier for an optical disc system. The preamplifier is based on an automatic gain control (AGC) system for obtaining a constant response and a stable output signal for input signals of a certain amplitude. The preamplifier includes a radio frequency amplifier for amplifying an output signal from the pick-up unit, an AGC unit for amplifying an output signal from the radio frequency amplifier to a desired level, an AGC detector unit coupled at its input terminal to an output terminal of the AGC unit and at its output terminal to an input terminal of the AGC unit. The AGC detector unit serves to rectify an output signal from the AGC unit, compare the rectified signal with a reference signal having a predetermined level, and send the resultant signal obtained by the comparison to the AGC unit. A mode selecting unit is coupled to the AGC detector unit and adapted to select one of several modes of operation, respectively corresponding to different equalization characteristics.

摘要翻译： 用于光盘系统的前置放大器。 前置放大器基于用于获得恒定响应的自动增益控制（AGC）系统和用于一定幅度的输入信号的稳定输出信号。 前置放大器包括用于放大来自拾取单元的输出信号的射频放大器，用于将来自射频放大器的输出信号放大到期望电平的AGC单元，在其输入端耦合到输出端子的AGC检测器单元 的AGC单元，并在其输出端连接到AGC单元的输入端。 AGC检测器单元用于对来自AGC单元的输出信号进行整流，将经整流的信号与具有预定电平的参考信号进行比较，并将通过比较获得的合成信号发送到AGC单元。 模式选择单元耦合到AGC检测器单元，并且适于分别对应于不同的均衡特性来选择若干操作模式之一。

公开(公告)号：US08345859B2

公开(公告)日：2013-01-01

申请号：US12009196

申请日：2008-01-16

申请人： Sam Heidari ,  Sigurd Schelstraete ,  Aner Tennen ,  Elango Pakriswamy ,  Chun-Sup Kim ,  Luiz Felipe Fuks

发明人： Sam Heidari ,  Sigurd Schelstraete ,  Aner Tennen ,  Elango Pakriswamy ,  Chun-Sup Kim ,  Luiz Felipe Fuks

IPC分类号： H04M1/00 ,  H04M9/00 ,  H04M7/00

CPC分类号： H04M11/062

摘要： A XDSL line card including an allocator for allocating power to the multi-tone modulated communications on each of the subscriber lines, and for selecting control parameters sufficient to effect communications on each of the subscriber lines at a power level proximate to an allocated power level therefore. The line card also includes configurable components coupled to one another to form a transmit path and a receive path to couple to the digital subscriber lines. The configurable components are responsive to the control parameters selected by the allocator to initialize multi-tone communications over each of the plurality of subscriber lines at a power level proximate the allocated power level.

摘要翻译： 一种XDSL线路卡，包括用于为每个用户线路上的多音调调制通信分配功率的分配器，并且用于选择足以在接近分配的功率电平的功率电平上在每个用户线上进行通信的控制参数 。 线卡还包括彼此耦合的可配置组件以形成发送路径和接收到数字用户线路的接收路径。 可配置组件响应于由分配器选择的控制参数，以在接近分配的功率电平的功率电平上初始化多个用户线中的每一个上的多音通信。

公开(公告)号：US08036293B1

公开(公告)日：2011-10-11

申请号：US12322002

申请日：2009-01-28

申请人： Chun-Sup Kim ,  Elango Pakriswamy ,  Luiz Felipe Fuks

发明人： Chun-Sup Kim ,  Elango Pakriswamy ,  Luiz Felipe Fuks

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04B3/08 ,  H03G1/0088 ,  H04L25/0204 ,  H04L25/0264 ,  H04L25/03159 ,  H04L27/2601 ,  H04M11/062

摘要： A transceiver having shared and discrete components forming a transmit path and a receive path configured to couple to a communication medium for establishing a multi-tone modulated communication channel thereon. The transceiver includes a line driver component on the transmit path. The line driver is configured to respond to a protocol determination and by configuring at least one of a transmit power level and a transmit bandwidth of the multi-tone modulated communication channel on the communication medium. The line driver includes a plurality of pre-amplifiers each exhibiting a combination of transmit power and bandwidth for amplification of a transmit signal modulated with a selected multi-tone modulation protocol. The line driver also includes a single output amplifier having an output coupled to the communication medium and an input switchably coupled to an output of a selected one of the plurality of pre-amplifiers in response to the protocol determination.

摘要翻译： 具有形成发送路径的共享和离散组件的收发机和被配置为耦合到通信介质以在其上建立多音调调制通信信道的接收路径。 收发器包括发送路径上的线路驱动器组件。 线路驱动器被配置为响应协议确定并且通过在通信介质上配置多音调调制通信信道的发射功率电平和发射带宽中的至少一个来配置。 线路驱动器包括多个前置放大器，每个前置放大器各自表现出发射功率和带宽的组合，用于放大以所选择的多音调制协议调制的发射信号。 线路驱动器还包括具有耦合到通信介质的输出的单个输出放大器和响应于协议确定可切换地耦合到多个前置放大器中的所选择的一个的输出的输入。

公开(公告)号：US06724219B1

公开(公告)日：2004-04-20

申请号：US09882499

申请日：2001-06-15

申请人： Chun-Sup Kim ,  Ara Bicakci ,  Cormac S. Conroy ,  Sang-Soo Lee

发明人： Chun-Sup Kim ,  Ara Bicakci ,  Cormac S. Conroy ,  Sang-Soo Lee

IPC分类号： H04B303

CPC分类号： H04L25/0278 ,  H04L1/0001 ,  H04L25/028

摘要： A line driver for coupling a data transceiver to a transmission line having a load impedance via a transformer with a turns ratio of 1:n includes an input port for receiving an input signal voltage from the data transceiver, an output port for supplying an output signal voltage to the transformer, and an amplifier circuit for amplifying the input signal voltage. The amplifier circuit includes a first output stage, a second output stage coupled to the output port, an output resistor coupled to the first output stage, a feedback path from the first output stage to an input of the amplifier circuit, and a line matching network coupled between the first output stage and the second output stage, for compensating variations in the load impedance, so that a synthesized output impedance of the line driver substantially matches an actual load impedance Z of the transmission line.

摘要翻译： 用于将数据收发器耦合到具有匝数比为1：n的变压器的具有负载阻抗的传输线的线路驱动器包括用于从数据收发器接收输入信号电压的输入端口，用于提供输出信号的输出端口 变压器的电压和用于放大输入信号电压的放大器电路。 放大器电路包括第一输出级，耦合到输出端的第二输出级，耦合到第一输出级的输出电阻，从第一输出级到放大器电路的输入的反馈路径，以及线匹配网络 耦合在第一输出级和第二输出级之间，用于补偿负载阻抗的变化，使得线路驱动器的合成输出阻抗基本上与传输线的实际负载阻抗Z匹配。

公开(公告)号：US06236628B1

公开(公告)日：2001-05-22

申请号：US09289987

申请日：1999-04-13

申请人： Chun-Sup Kim

发明人： Chun-Sup Kim

IPC分类号： G11B700

CPC分类号： G11B7/0906 ,  G11B7/005 ,  G11B7/094 ,  G11B7/0941

摘要： A read channel circuit of an optical disk reproducing apparatus is adapted to provide stability in servo control and reduce power consumption by revising the offset component of the circuit components after application of reference signals and then the offset component caused by pit depth resulting from signals read out in reproducing a data from an optical disk. The read channel circuit includes: a data converting section for amplifying signals input via different channels and converting them to digital data. A data reproducing section is provided for summing and waveform-equalizing the digital signals, detecting the phase difference between the waveform-equalized signals and reference sampling points, and generating a sampling clock frequency which is provided to the data converting section for compensating for the phase difference. A servo error signal detecting signal is provided for delaying the signals input from the data converting section by phases specified by the offset revision control signal and the pit depth revision control signal, summing the delayed signals into a plurality of signals, and generating the tracking error signals based on the comparison of phase differences between the summed signals.

摘要翻译： 光盘再现装置的读通道电路适用于提供伺服控制的稳定性，并且在施加参考信号之后修改电路部件的偏移分量，然后由由读出的信号导致的凹坑深度引起的偏移分量来降低功耗 在从光盘再现数据时。 读通道电路包括：数据转换部分，用于放大经由不同通道输入的信号并将其转换为数字数据。 提供数据再现部分，用于对数字信号求和和波形均衡，检测波形均衡信号和参考采样点之间的相位差，并产生提供给数据转换部分的补偿相位的采样时钟频率 区别。 提供伺服误差信号检测信号，用于将从数据转换部分输入的信号延迟由偏移修正控制信号和凹坑深度修正控制信号指定的相位，将延迟的信号加到多个信号中，并产生跟踪误差 基于相加信号之间的相位差的信号。

公开(公告)号：US08947282B1

公开(公告)日：2015-02-03

申请号：US12931018

申请日：2011-01-20

申请人： Luiz Felipe Fuks ,  Elango Pakriswamy ,  Nicolas Monier ,  Chun-Sup Kim

发明人： Luiz Felipe Fuks ,  Elango Pakriswamy ,  Nicolas Monier ,  Chun-Sup Kim

IPC分类号： H03M1/78

CPC分类号： H03M1/68 ,  H03M1/742

摘要： A current controller includes impedance elements coupled to form at least one impedance ladder circuit which exhibits a fixed impedance at an input and current divider steps each differing in a current magnitude by a multiple of three with respect to the current magnitude in an adjacent less significant step. Single pole triple throw (SPTT) switchably couple an associated step in the impedance ladder circuit to one of three outputs. Three discrete current sources or sinks are each coupled to a corresponding one of the outputs of each of the SPTT switches. The digital driver is coupled to each control input of each SPTT switch to additively deliver selected ones of the stepped currents from each step of the impedance ladder circuit to a corresponding selected one of the current sources or sinks.

摘要翻译： 电流控制器包括被耦合以形成至少一个阻抗梯形电路的阻抗元件，该阻抗梯形电路在输入和电流分压器步骤中呈现固定阻抗，每个输入电流和电流分压器步骤在相邻的较不重要的步骤中相对于电流幅度在电流幅度上相差三倍 。 单极三掷（SPTT）可将阻抗梯形电路中的相关步骤切换到三个输出之一。 三个离散电流源或吸收器各自耦合到每个SPTT开关的相应输出之一。 数字驱动器耦合到每个SPTT开关的每个控制输入，以将来自阻抗梯形电路的每个步骤的选定的步进电流相加地递送到相应的所选电流源或汇。

公开(公告)号：US06330218B1

公开(公告)日：2001-12-11

申请号：US09201894

申请日：1998-11-30

申请人： Chun-Sup Kim

发明人： Chun-Sup Kim

IPC分类号： G11B700

CPC分类号： G11B7/094 ,  G11B7/0901

摘要： A balance gain tuning apparatus including a first amplifying part amplifying one of signals output from a optical pickup to a fixed gain; a second amplifying part amplifying another signal of the signals output from the optical pickup to a tunable gain; a subtracting part producing a difference of an output of the first amplifying part and that of the second amplifying part; and a servo control part tuning the gain of the second amplifying part in response to an output of the subtracting part.

摘要翻译： 一种平衡增益调谐装置，包括将从光学拾取器输出的信号中的一个放大到固定增益的第一放大部分; 将从光拾取器输出的信号的另一个信号放大到可调增益的第二放大部分;产生第一放大部分和第二放大部分的输出差的减法部分; 以及伺服控制部件，其响应于所述减法部件的输出来调整所述第二放大部件的增益。

公开(公告)号：US07944301B1

公开(公告)日：2011-05-17

申请号：US12799154

申请日：2010-04-20

申请人： Chun-Sup Kim

发明人： Chun-Sup Kim

IPC分类号： H03F3/18

CPC分类号： H03F3/3069 ,  H03F1/307 ,  H03F1/308 ,  H03F3/3022

摘要： An amplifier including complementary push and pull components, a bias component and a quiescent current balancer. The complementary push and pull components are serially coupled to one another between an electrical source and sink to generate an output signal at a common output terminal responsive to the input signal source. The bias component is coupled between the input signal source and the complementary push-pull components to bias the input signal to the push component and the input signal to the pull component by discrete amounts which reduce cross-over clipping exhibited in the output signal. The quiescent current balancer is coupled to the output terminal to balance quiescent currents in the push and the pull component at discrete levels which equilibrate amplification levels of the input signal generated by the push component and the pull component in the output signal at the output terminal.

摘要翻译： 放大器，包括互补的推挽元件，偏置元件和静态电流平衡器。 互补推挽元件在电源和接收器之间彼此串联耦合，以响应于输入信号源在公共输出端产生输出信号。 偏置分量耦合在输入信号源和互补推挽分量之间，以将输入信号偏压到推动分量，并将输入信号偏置到拉分量，离散量减少输出信号中所显示的交叉限幅。 静态电流平衡器耦合到输出端子，以平衡在输出端子处的输出信号中由推组件和拉分量产生的输入信号的放大电平的离散电平的推和分量中的静态电流。

公开(公告)号：US06603356B1

公开(公告)日：2003-08-05

申请号：US10047960

申请日：2002-01-14

申请人： Chun-Sup Kim ,  Ara Bicakci ,  Sang-Soo Lee

发明人： Chun-Sup Kim ,  Ara Bicakci ,  Sang-Soo Lee

IPC分类号： H03F326

CPC分类号： H03F1/308 ,  H03F3/3064

摘要： A method and circuit control a quiescent current of an amplifier including a preamplifier, error amplifiers, and output devices driven by the error amplifiers, the error amplifiers having an input-referred offset voltage. The method includes (a) applying a calibration voltage to an input of the error amplifiers, (b) calibrating a quiescent current of the output devices by changing the calibration voltage so that the calibrated quiescent current has a predetermined current value, the calibration voltage corresponding to the calibrated quiescent current being set as a correction voltage, and (c) operating the amplifier with the correction voltage applied to the input of the error amplifiers. The circuit includes a correction voltage generator supplying a correction voltage to the error amplifier input, a quiescent current detector detecting the quiescent current, and a calibration circuit adjusting the correction voltage so that the quiescent current is calibrated to a predetermined current value.

摘要翻译： 一种方法和电路控制包括由误差放大器驱动的前置放大器，误差放大器和输出装置的放大器的静态电流，误差放大器具有输入参考偏移电压。 该方法包括（a）将校准电压施加到误差放大器的输入端，（b）通过改变校准电压来校准输出装置的静态电流，使得校准的静态电流具有预定的电流值，校准电压对应 将校正的静态电流设置为校正电压，以及（c）使用施加到误差放大器的输入的校正电压来操作放大器。 该电路包括校正电压发生器，其向误差放大器输入端提供校正电压，静态电流检测器检测静态电流;校准电路调节校正电压，使得静态电流被校准到预定电流值。

公开(公告)号：US06498534B1

公开(公告)日：2002-12-24

申请号：US09882497

申请日：2001-06-15

申请人： Chun-Sup Kim ,  Sang-Soo Lee

发明人： Chun-Sup Kim ,  Sang-Soo Lee

IPC分类号： H03G320

CPC分类号： H03F1/025 ,  H03F1/0277 ,  H03G3/3026

摘要： A variable-gain amplifier circuit includes an input port, an output port, and first and second amplifiers coupled therebetween. The first amplifier includes a first amplifier path having a first amplification factor, effective when the input signal has a voltage level in a first range, and a second amplifier path having a second amplification factor greater than the first amplification factor, effective when the input signal has a voltage level in a second range including voltages of a first polarity greater than that in the first range. The second amplifier includes a third amplifier path having the first amplification factor, effective when the input signal has a voltage level in a third range, and a fourth amplifier path having the second amplification factor, effective when the input signal has a voltage level in a fourth range including voltages of a second polarity greater than that in the third range.

摘要翻译： 可变增益放大器电路包括输入端口，输出端口以及耦合在其间的第一和第二放大器。 第一放大器包括具有第一放大因子的第一放大器路径，当输入信号具有在第一范围内的电压电平时有效;以及第二放大器路径，具有大于第一放大因子的第二放大系数，当输入信号 具有包括第一极性大于第一范围的电压的第二范围内的电压电平。 第二放大器包括具有第一放大因子的第三放大器路径，当输入信号具有第三范围内的电压电平时有效;以及第四放大器路径，具有第二放大因子，当输入信号具有第 第四范围包括大于第三范围的第二极性的电压。