公开(公告)号：US06819722B2

公开(公告)日：2004-11-16

申请号：US09732564

申请日：2000-12-08

Applicant: Ichiro Hatakeyama

Inventor： Ichiro Hatakeyama

IPC: H04L2566

CPC classification number: H04B10/6933

Abstract: An offset control circuit can obtain an output waveform free of fluctuation of duty ratio by canceling offset transitionally varying according to elapsed time even upon reception of an optical signal in burst form significantly variable of level difference, an optical receiver employing the same and an optical communication system. The offset control circuit has offset canceling means for canceling an offset component included in a pair of positive-phase and negative-phase signal and varying transitionally according to elapse of time by using at least one of a peak value and a bottom value of the positive-phase and negative-phase signal.

Abstract translation: 偏移控制电路可以通过消除随着时间的流逝变化而变化的输出波形，即使在接收到电平差异显着变化的脉冲串形式的光信号，使用该光信号的光接收器和光通信 系统。 偏移控制电路具有偏移消除装置，用于消除包括在一对正相和负相信号中的偏移分量，并且随着时间的推移而变化，通过使用正值的峰值和底值中的至少一个 相和负相信号。

公开(公告)号：US20040075484A1

公开(公告)日：2004-04-22

申请号：US10681306

申请日：2003-10-09

Applicant: FUJITSU LIMITED

Inventor： Kazunori Nishizono ,  Tatsuo Kumano

IPC: G06G007/19

CPC classification number: H04B10/6933 ,  H03F3/087 ,  H03F3/45973 ,  H03K3/02337 ,  H03K5/007 ,  H03K5/086 ,  H04B10/6911 ,  H04B10/6931

Abstract: A current pulse receiving circuit suitable for converting a current pulse converted by a photodetector from a light pulse received in optical communications and outputting a logic level voltage pulse with an accurate pulse width is disclosed. When an output signal from a current-to-voltage converter circuit is detected to have a large amplitude by a large signal detection circuit, an amount of offset cancellation of a DC cancellation circuit is decreased to limit the amplitude of the output signal from the current-to-voltage converter circuit. Since the amplitude of an input signal of an amplifier circuit is limited, tail characteristics at a trailing edge of a pulse are small and an output is provided at an output terminal with an accurate pulse width.

Abstract translation: 公开了一种电流脉冲接收电路，其适用于将由光电检测器转换的电流脉冲从光通信中接收的光脉冲转换并输出具有精确脉冲宽度的逻辑电平电压脉冲。 当通过大信号检测电路检测到来自电流 - 电压转换器电路的输出信号具有大幅度时，减小直流消除电路的偏移消除量，以限制来自电流 - 电压转换器电路的输出信号的幅度 电压转换电路。 由于放大器电路的输入信号的幅度受到限制，所以在脉冲后沿的尾部特性较小，输出端以精确的脉冲宽度提供输出。

公开(公告)号：US20030098724A1

公开(公告)日：2003-05-29

申请号：US10278902

申请日：2002-10-24

Applicant: FUJITSU LIMITED

Inventor： Kazunori Nishizono

IPC: H03K005/00

CPC classification number: H03F3/45973 ,  H03F3/087 ,  H03F3/45977 ,  H03K5/086 ,  H03K5/1252 ,  H04B10/6933

Abstract: A receiving circuit including an amplifier for generating a receiving voltage signal, a comparator for generating a binary signal from the receiving voltage signal, and a logic maintaining circuit for receiving the binary signal and maintaining the binary signal at a shifted level for a predetermined period after the level of the binary signal is shifted. The logic maintaining circuit prevents noise pulses from appearing in a receiving signal.

Abstract translation: 一种接收电路，包括用于产生接收电压信号的放大器，用于从接收电压信号产生二进制信号的比较器，以及逻辑维持电路，用于接收二进制信号，并将二进制信号保持在移位电平一段预定时间段之后 二进制信号的电平被移位。 逻辑维持电路防止在接收信号中出现噪声脉冲。

公开(公告)号：US5892609A

公开(公告)日：1999-04-06

申请号：US862297

申请日：1997-05-22

Applicant: Eiji Saruwatari

Inventor： Eiji Saruwatari

IPC: G01R19/04 ,  H03F3/08 ,  H03K5/08 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60 ,  H04B10/69 ,  H04B10/06

CPC classification number: H04B10/695 ,  H04B10/6933

Abstract: An optical signal is converted by a light-receiving element into a photoelectric current. The photoelectric current is converted by a preamplifier into a positive phase voltage and the opposite phase voltage. The peaks of the positive phase output and opposite phase output are sensed and held by a first and second peak sensing circuits. The median between the output of the second peak sensing circuit and the positive phase output of the preamplifier is determined by a first median output circuit. The median between the output of the first peak sensing circuit and the opposite phase output of the preamplifier is determined by a second median output circuit. A level comparison circuit compares the outputs of the first and second median output circuits and produces a signal voltage with a constant amplitude within a specific input voltage range, thereby producing a reception signal. This helps alleviate duty fluctuations and the deterioration of the reception sensitivity resulting from the dark current of the light-receiving element or fluctuations in the output offset voltage of the preamplifier.

Abstract translation: 光信号由光接收元件转换为光电流。 光电流由前置放大器转换成正相电压和反相电压。 正相输出和反相输出的峰值由第一和第二峰值感测电路检测和保持。 第二峰值检测电路的输出与前置放大器的正相输出之间的中值由第一中值输出电路确定。 第一峰值检测电路的输出与前置放大器的相反相位输出之间的中值由第二中值输出电路确定。 电平比较电路比较第一和第二中值输出电路的输出，并在特定输入电压范围内产生具有恒定幅度的信号电压，从而产生接收信号。 这有助于减轻负载波动和由于光接收元件的暗电流引起的接收灵敏度的劣化或前置放大器的输出失调电压的波动。

公开(公告)号：US5737111A

公开(公告)日：1998-04-07

申请号：US777647

申请日：1996-12-31

Applicant: Kazuyuki Mori ,  Kohei Shibata

Inventor： Kazuyuki Mori ,  Kohei Shibata

IPC: H01L31/10 ,  H04B10/07 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60 ,  H04B10/67 ,  H04B10/69 ,  H04L25/03 ,  H04B10/06

CPC classification number: H04B10/6933

Abstract: An optical receiving apparatus is provided which is constructed to compensate for a rise in offset level attributable to low-frequency response of a light-receiving device. An offset detecting circuit detects a quantity of electricity indicative of an offset current quantity which corresponds to the zero level of an optical signal within the current quantity output from the light-receiving device, and a current subtracting circuit reproduces the offset current quantity based on the detected quantity of electricity, subtracts the reproduced offset current quantity from the current quantity output from the light-receiving device, and supplies the result to a preamplifier.

Abstract translation: 提供一种光接收装置，其被构造为补偿归因于光接收装置的低频响应的偏移电平的上升。 偏移检测电路检测表示与从光接收装置输出的电流量中的光信号的零电平对应的偏移电流量的电量，电流减法电路基于 检测出的电量，从光接收装置输出的电流量中减去再现的偏移电流量，并将结果提供给前置放大器。

公开(公告)号：US5734300A

公开(公告)日：1998-03-31

申请号：US650276

申请日：1996-05-17

Applicant: James Daniel Yoder

Inventor： James Daniel Yoder

IPC: H03F3/08 ,  H04B10/158 ,  H04B10/06

CPC classification number: H04B10/6933 ,  H03F3/082

Abstract: A preamplifier overload control circuit which enhances the dynamic range of the preamplifier. Separate paths shunt corresponding DC and AC components of the signal from an electro-optical device away from the preamplifier input. The amount of shunting in both paths are controlled by a common control signal, here the average DC value of the signal, such that substantially all of the DC signal is shunted away from the preamplifier input.

Abstract translation: 前置放大器过载控制电路，增强了前置放大器的动态范围。 分离的路径将来自电光装置的信号的相应DC和AC分量与前置放大器输入分流。 在两个路径中的分流量由公共控制信号控制，这里是信号的平均DC值，使得基本上所有的DC信号都被分流离开前置放大器输入。

公开(公告)号：US5663671A

公开(公告)日：1997-09-02

申请号：US595564

申请日：1996-02-01

Applicant: Helmar R. Steglich

Inventor： Helmar R. Steglich

IPC: H03F3/08 ,  H03G3/30 ,  H03G11/00 ,  H03K5/08 ,  H04B10/158

CPC classification number: H03K5/082 ,  H03F3/087 ,  H03G11/00 ,  H03G3/3084 ,  H04B10/6933

Abstract: An electronic clamping circuit is provided in one preferred embodiment, the clamping circuit includes a pair of series-connected diodes, both having the same bias, which are shunted across a feedback path of a transimpedance amplifier circuit. A capacitive element is connected to a node in-between the diodes and a potential (e.g., ground). The arrangement of the diodes and capacitive element serve to keep the amplifier circuit's operation within its linear limits without severely degrading its bandwidth.

Abstract translation: 在一个优选实施例中提供电子钳位电路，钳位电路包括一对具有相同偏置的串联二极管，它们跨越跨阻抗放大器电路的反馈路径并流。 电容元件连接到二极管之间的节点和电位（例如，接地）。 二极管和电容元件的布置用于将放大器电路的工作保持在线性范围内，而不会严重降低其带宽。

公开(公告)号：US5430766A

公开(公告)日：1995-07-04

申请号：US293908

申请日：1994-08-22

Applicant: Yusuke Ota ,  Robert G. Swartz

Inventor： Yusuke Ota ,  Robert G. Swartz

IPC: H04B1/06 ,  H04B1/18 ,  H04B10/158 ,  H04B14/04 ,  H04L25/03 ,  H04L25/06

CPC classification number: H04B10/695 ,  H04B10/6933 ,  H04L25/06

Abstract: A dc-coupled packet mode digital data receiver, for use with an optical bus uses peak detectors to adaptively establish an instantaneous logic threshold at the beginning of a data burst. A dc compensator, responsive to outputs of the peak detectors, shunts dc or low frequency currents, corresponding to "dark level" optical signals, from the input of the receiver.

Abstract translation: 与光总线一起使用的直流耦合分组模式数字数据接收机使用峰值检测器在数据突发开始时自适应地建立瞬时逻辑门限。 直流补偿器响应于峰值检测器的输出，从接收器的输入端分流对应于“暗电平”光信号的直流或低频电流。

公开(公告)号：US5371763A

公开(公告)日：1994-12-06

申请号：US976037

申请日：1992-11-13

Applicant: Yusuke Ota ,  Robert G. Swartz

Inventor： Yusuke Ota ,  Robert G. Swartz

IPC: H04B1/06 ,  H04B1/18 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/158 ,  H04B10/26 ,  H04B10/28 ,  H04B14/04 ,  H04L25/03 ,  H04L25/06

CPC classification number: H04B10/695 ,  H04B10/6933 ,  H04L25/06

Abstract: A dc-coupled packet mode digital data receiver, for use with an optical bus, uses a peak detector(s) to adaptively establish an instantaneous logic threshold at the beginning of a data burst. A reset circuit resets the peak detector(s) and other circuits of the receiver in response to an end-of-packet reset signal, thereby enabling the reception of closely-spaced burst date packets which have greatly differing power levels.

Abstract translation: 与光总线一起使用的直流耦合分组模式数字数据接收机使用峰值检测器在数据突发开始时自适应地建立瞬时逻辑阈值。 复位电路响应于分组结束复位信号复位接收机的峰值检测器和其他电路，从而使得能够接收具有极大不同功率电平的紧密间隔的脉冲串日期分组。

公开(公告)号：US5295161A

公开(公告)日：1994-03-15

申请号：US698626

申请日：1991-05-10

Applicant: Daniel M. Dreps ,  Raymond P. Rizzo

Inventor： Daniel M. Dreps ,  Raymond P. Rizzo

IPC: H03F3/34 ,  H03F3/08 ,  H03F3/45 ,  H04B10/158 ,  H04L25/06

CPC classification number: H04B10/6933 ,  H03F3/08

Abstract: A differential transimpedance amplifier used in amplifying optical signals transmitted with a balanced code has a level restore circuit which integrates the digital output of the amplifier and feeds back the result to one of the differential inputs of the amplifier. The feedback signal removes imbalances from the amplifier output. The balanced amplifier output can then be processed by a clock reconstruction circuit to accurately sample the received optical signal with a low bit error rate.

Abstract translation: 用于放大用平衡码发射的光信号的差分跨阻放大器具有电平恢复电路，其对放大器的数字输出进行积分并将结果反馈到放大器的差分输入之一。 反馈信号消除了放大器输出的不平衡。 然后，平衡放大器输出可以由时钟重构电路处理，以以低误码率对接收的光信号进行精确采样。