公开(公告)号：US20180145645A1

公开(公告)日：2018-05-24

申请号：US15861109

申请日：2018-01-03

Applicant: Renesas Electronics Corporation

Inventor： Hitoshi IMAI

IPC: H03F3/08 ,  H04B15/00 ,  H04B10/80 ,  G01J1/44

CPC classification number: H03F3/085 ,  G01J2001/444 ,  H04B10/802 ,  H04B15/005

Abstract: A light-emitting unit outputs an optical signal corresponding to an input electric signal. A light-receiving unit is electrically insulated from the light-emitting unit and outputs an electric signal according to the received optical signal as an output signal. In the light-receiving unit, a first light-receiving device outputs an optical current according to the optical signal. A second light-receiving device is provided not to receive the optical signal. A current duplication circuit duplicates a current flowing through the second light-receiving device. A current-voltage conversion circuit converts a current, which is generated by subtracting the current duplicated by the current duplication circuit from a current flowing through the first light-receiving device, into a voltage signal. A comparator output a result of a comparison between the voltage signal converted by the current-voltage conversion circuit and a threshold voltage as the output signal.

公开(公告)号：US20150333841A1

公开(公告)日：2015-11-19

申请号：US14698998

申请日：2015-04-29

Applicant: Renesas Electronics Corporation

Inventor： Hitoshi IMAI

IPC: H04B10/80 ,  H04B15/00

CPC classification number: H03F3/085 ,  G01J2001/444 ,  H04B10/802 ,  H04B15/005

Abstract: A light-emitting unit outputs an optical signal corresponding to an input electric signal. A light-receiving unit is electrically insulated from the light-emitting unit and outputs an electric signal according to the received optical signal as an output signal. In the light-receiving unit, a first light-receiving device outputs an optical current according to the optical signal. A second light-receiving device is provided not to receive the optical signal. A current duplication circuit duplicates a current flowing through the second light-receiving device. A current-voltage conversion circuit converts a current, which is generated by subtracting the current duplicated by the current duplication circuit from a current flowing through the first light-receiving device, into a voltage signal. A comparator output a result of a comparison between the voltage signal converted by the current-voltage conversion circuit and a threshold voltage as the output signal.

Abstract translation: 发光单元输出对应于输入电信号的光信号。 光接收单元与发光单元电绝缘，并根据所接收的光信号输出电信号作为输出信号。 在光接收单元中，第一光接收装置根据光信号输出光电流。 提供第二光接收装置不接收光信号。 电流复制电路复制流过第二光接收装置的电流。 电流 - 电压转换电路将通过从当前复制电路复制的电流从流过第一光接收装置的电流中减去的电流转换成电压信号。 比较器输出由电流 - 电压转换电路转换的电压信号与阈值电压之间的比较结果作为输出信号。

公开(公告)号：US20140117212A1

公开(公告)日：2014-05-01

申请号：US14063747

申请日：2013-10-25

Applicant: Renesas Electronics Corporation

Inventor： Hitoshi IMAI ,  Hirotatsu Tanaka

IPC: H03F3/08

CPC classification number: H03F3/087 ,  H03F3/082 ,  H04N1/00997 ,  H04N2201/02497 ,  H04N2201/03166

Abstract: A semiconductor device that includes: a first trans-impedance amplifier that converts a first current signal generated by a first photodiode, into which an optical signal is input, into a first voltage signal; a second trans-impedance amplifier that converts a second current signal generated by a second photodiode, to which an optical signal is blocked, into a second voltage signal; a peak hold circuit that holds the peak value of the first voltage signal; a comparator that outputs a pulse on the basis of the first and second voltage signals; and a threshold current setting circuit that draws out a threshold current, which is proportional to a reference current generated on the basis of a voltage difference between a peak voltage output by the peak hold circuit and a reference voltage at the output node of the second photodiode, from the connection between the second photodiode and the second trans-impedance amplifier.

Abstract translation: 一种半导体器件，包括：第一跨阻抗放大器，将由输入光信号的第一光电二极管产生的第一电流信号转换为第一电压信号; 第二跨阻抗放大器，将由光信号被阻挡的第二光电二极管产生的第二电流信号转换成第二电压信号; 保持所述第一电压信号的峰值的峰值保持电路; 基于所述第一和第二电压信号输出脉冲的比较器; 以及阈值电流设定电路，其提取阈值电流，该阈值电流与基于由峰值保持电路输出的峰值电压与第二光电二极管的输出节点处的基准电压之间的电压差产生的基准电流成比例 从第二光电二极管和第二跨阻放大器之间的连接。