公开(公告)号：US20160036418A1

公开(公告)日：2016-02-04

申请号：US14811835

申请日：2015-07-29

Applicant: HITACHI, LTD.

Inventor： Hiroyasu YOSHIZAWA ,  Satoshi HANAZAWA ,  Nao MIYAMOTO

IPC: H03K3/013 ,  H03K17/687

CPC classification number: H03K3/013 ,  B06B1/0207 ,  B06B1/0622 ,  H03K4/06 ,  H03K17/687

Abstract: Provided is a transmission drive circuit which can reduce distortions of a transmission signal and transmission noise, and is isolable from a signal line. A transmission drive circuit 700 includes a drive transistor 10 and an isolation diode 31 connected between a node n1 coupled to a signal line SL commonly used to propagate a transmission signal and a reception signal and a power source line HVP, and further includes an isolation diode 32 and a drive transistor 20 connected between the node n1 and a voltage line HVM. Furthermore, the transmission drive circuit 700 includes a switch 41 connected between a node n2 between the drive transistor 10 and the isolation diode 31, and a node n4 of a ground voltage Vs, and a switch 43 connected between a node n3 between the drive transistor 20 and the isolation diode 32, and a node n4. When the transmission signal is propagated through the signal line SL, the switches 41 and 43 are turned off by the clamp switch control circuit 200 such that bias current flows through the drive transistor 10, the isolation diode 31, the isolation diode 32 and the drive transistor 20.

Abstract translation: 提供了可以减少发送信号的失真和发送噪声的发送驱动电路，并且可以与信号线隔离。 传输驱动电路700包括连接在通常用于传播发送信号的信号线SL的节点n1和接收信号和电源线HVP之间的驱动晶体管10和隔离二极管31，还包括隔离二极管 32和连接在节点n1和电压线HVM之间的驱动晶体管20。 此外，发送驱动电路700包括连接在驱动晶体管10和隔离二极管31之间的节点n2和接地电压Vs的节点n4之间的开关41，以及连接在驱动晶体管10之间的节点n3之间的开关43 20和隔离二极管32，以及节点n4。 当传输信号通过信号线SL传播时，开关41和43被钳位开关控制电路200截止，使得偏置电流流过驱动晶体管10，隔离二极管31，隔离二极管32和驱动器 晶体管20。