公开(公告)号：US06567441B2

公开(公告)日：2003-05-20

申请号：US09841694

申请日：2001-03-29

申请人： Seigo Furudate ,  Eiji Tsumura ,  Sosaku Sawada ,  Hiroshi Hara

发明人： Seigo Furudate ,  Eiji Tsumura ,  Sosaku Sawada ,  Hiroshi Hara

IPC分类号： H01S300

CPC分类号： H01S5/042 ,  H01S5/0683

摘要： Provided are a source follower circuit having a current source having its improved current characteristics, laser driving apparatus, semiconductor laser apparatus, current-voltage conversion circuit, and light receiving circuit. Each of the laser driving apparatus, semiconductor laser apparatus, current-voltage conversion circuit, and light receiving circuit comprises the source follower circuit. The source follower circuit 10 comprises a source follower stage 12 and a bias stage 14. The source follower stage has III-V compound semiconductor transistors 16, 18 and 20. The bias stage 14 has a first node 22 for providing a first bias voltage and a second node 24 for providing a second biasing voltage different from the first biasing voltage. The gate of transistor 16 is coupled to input 26 and a source thereof is coupled to output 28. The gate of transistor 18 is connected to the second node 24. The gate of transistor 20 is connected to the first node 24. The transistor 20 is arranged between the source of the transistor 16 and the drain of the transistor 18.

公开(公告)号：US07668469B2

公开(公告)日：2010-02-23

申请号：US11411224

申请日：2006-04-26

申请人： Seigo Furudate ,  Keiji Tanaka

发明人： Seigo Furudate ,  Keiji Tanaka

IPC分类号： H04B10/06

CPC分类号： H04B10/66

摘要： The present invention provides an optical receiver that enables to vary the sensitivity depending on the transmission speed. The optical receiver provides a photodiode to generate the photocurrent, the pre-amplifier to convert the photocurrent to the voltage signal, the lead pin to supply the bias voltage to the photodiode, and the control block to generate the switching signal for varying the current-to-voltage conversion efficiency and the frequency bandwidth of the pre-amplifier based on the control signal. The control signal is commonly provided from the lead pin through which the bias voltage is applied. The control block interprets the signal applied to the lead pin and generates the switching signal.

摘要翻译： 本发明提供一种能够根据传输速度改变灵敏度的光接收机。 光接收器提供光电二极管以产生光电流，前置放大器将光电流转换为电压信号，引脚引脚将偏置电压提供给光电二极管，控制块产生开关信号， 基于控制信号的前置放大器的电压转换效率和频率带宽。 控制信号通常由施加偏置电压的引脚引脚提供。 控制块解释施加到引脚引脚的信号并产生开关信号。

公开(公告)号：US20060257153A1

公开(公告)日：2006-11-16

申请号：US11411224

申请日：2006-04-26

申请人： Seigo Furudate ,  Keiji Tanaka

发明人： Seigo Furudate ,  Keiji Tanaka

IPC分类号： H04B10/06

CPC分类号： H04B10/66

摘要： The present invention provides an optical receiver that enables to vary the sensitivity depending on the transmission speed. The optical receiver provides a photodiode to generate the photocurrent, the pre-amplifier to convert the photocurrent to the voltage signal, the lead pin to supply the bias voltage to the photodiode, and the control block to generate the switching signal for varying the current-to-voltage conversion efficiency and the frequency bandwidth of the pre-amplifier based on the control signal. The control signal is commonly provided from the lead pin through which the bias voltage is applied. The control block interprets the signal applied to the lead pin and generates the switching signal.

摘要翻译： 本发明提供一种能够根据传输速度改变灵敏度的光接收机。 光接收器提供光电二极管以产生光电流，前置放大器将光电流转换为电压信号，引脚引脚将偏置电压提供给光电二极管，控制块产生开关信号， 基于控制信号的前置放大器的电压转换效率和频率带宽。 控制信号通常由施加偏置电压的引脚引脚提供。 控制块解释施加到引脚引脚的信号并产生开关信号。

公开(公告)号：US07917043B2

公开(公告)日：2011-03-29

申请号：US12642015

申请日：2009-12-18

申请人： Seigo Furudate ,  Keiji Tanaka

发明人： Seigo Furudate ,  Keiji Tanaka

IPC分类号： H04B10/06

CPC分类号： H04B10/66

摘要： The present invention provides an optical receiver that enables to vary the sensitivity depending on the transmission speed. The optical receiver provides a photodiode to generate the photocurrent, the pre-amplifier to convert the photocurrent to the voltage signal, the lead pin to supply the bias voltage to the photodiode, and the control block to generate the switching signal for varying the current-to-voltage conversion efficiency and the frequency bandwidth of the pre-amplifier based on the control signal. The control signal is commonly provided from the lead pin through which the bias voltage is applied. The control block interprets the signal applied to the lead pin and generates the switching signal.

摘要翻译： 本发明提供一种能够根据传输速度改变灵敏度的光接收机。 光接收器提供光电二极管以产生光电流，前置放大器将光电流转换为电压信号，引脚引脚将偏置电压提供给光电二极管，控制块产生开关信号， 基于控制信号的前置放大器的电压转换效率和频率带宽。 控制信号通常由施加偏置电压的引脚引脚提供。 控制块解释施加到引脚引脚的信号并产生开关信号。

公开(公告)号：US20080232822A1

公开(公告)日：2008-09-25

申请号：US12076008

申请日：2008-03-12

申请人： Seigo Furudate ,  Shigenoshin Seto

发明人： Seigo Furudate ,  Shigenoshin Seto

IPC分类号： H04B10/06

CPC分类号： H04B10/693

摘要： The present invention provides an optical receiver that suppresses the saturation in the output without alleviating the bandwidth restriction of the current-to-voltage conversion gain. This optical receiver comprises an amplifier 4 for receiving a photocurrent IIN from a photodiode, and a plurality of trans-impedance elements connected in parallel between the input terminal and the output terminal of the amplifier 4. One trans-impedance element includes only resistor, while the other trans-impedance elements include semiconductor switches and resistors connected in series to the semiconductor switches so as to put the semiconductor switches therebetween.

摘要翻译： 本发明提供了抑制输出饱和的光接收器，而不减轻电流 - 电压转换增益的带宽限制。 该光接收器包括用于从光电二极管接收光电流I IN的放大器4和在放大器4的输入端和输出端之间并联连接的多个跨阻元件。 一个跨阻抗元件仅包括电阻器，而其它跨阻抗元件包括与半导体开关串联连接的半导体开关和电阻器，以将半导体开关放置在其间。

公开(公告)号：US20100098437A1

公开(公告)日：2010-04-22

申请号：US12642015

申请日：2009-12-18

申请人： Seigo FURUDATE ,  Keiji Tanaka

发明人： Seigo FURUDATE ,  Keiji Tanaka

IPC分类号： H04B10/06

CPC分类号： H04B10/66

摘要： The present invention provides an optical receiver that enables to vary the sensitivity depending on the transmission speed. The optical receiver provides a photodiode to generate the photocurrent, the pre-amplifier to convert the photocurrent to the voltage signal, the lead pin to supply the bias voltage to the photodiode, and the control block to generate the switching signal for varying the current-to-voltage conversion efficiency and the frequency bandwidth of the pre-amplifier based on the control signal. The control signal is commonly provided from the lead pin through which the bias voltage is applied. The control block interprets the signal applied to the lead pin and generates the switching signal.

摘要翻译： 本发明提供一种能够根据传输速度改变灵敏度的光接收机。 光接收器提供光电二极管以产生光电流，前置放大器将光电流转换为电压信号，引脚引脚将偏置电压提供给光电二极管，控制块产生开关信号， 基于控制信号的前置放大器的电压转换效率和频率带宽。 控制信号通常由施加偏置电压的引脚引脚提供。 控制块解释施加到引脚引脚的信号，并产生开关信号。