公开(公告)号：US5808502A

公开(公告)日：1998-09-15

申请号：US622703

申请日：1996-03-26

Applicant: Alex Chi-Ming Hui ,  Yao Tung Yen ,  En-Ling Feng ,  Daniel J. Dove

Inventor： Alex Chi-Ming Hui ,  Yao Tung Yen ,  En-Ling Feng ,  Daniel J. Dove

IPC: G11C7/10 ,  H03K17/06 ,  H03K17/16 ,  H03L5/00

CPC classification number: G11C7/1006 ,  H03K17/063 ,  H03K17/162 ,  H03K2217/0018

Abstract: A micro-relay replaces electromechanical and solid-state opto-isolated relays in a computer network. The micro relay is an integrated circuit containing several bus switches in parallel. Each bus switch can make or break a connection. The bus switch is an n-channel MOS transistor with the source and drain connected to different network busses. A bus enable input causes the connection to be made or broken. The bus enable input is separately buffered for each gate of each MOS transistor to prevent crosstalk between bus switches. Since the MOS transistor stops conducting when the source is at a voltage level of the power-supply voltage minus the threshold voltage, a boosted voltage is applied to the gate of the MOS transistor to allow conduction even when the source is at the power-supply voltage level. The boosted voltage is generated by a charge pump. A substrate bias is applied to the transistors to prevent crosstalk from undershoots. Buffers for the gates of the bus switches are inverters that are connected to the boosted voltage rather than the power supply, and to the substrate voltage rather than ground. Thus the gates are driven to the boosted voltage or to the substrate voltage. For reduced crosstalk when the connection is broken, two transistors in series are used for each bus switch, with the intermediate node being pulled to ground when the bus switch is disabled, shielding the two transistors and the two network busses on opposite sides of the bus switch. An external capacitor is used to reduce noise from the charge pump.

Abstract translation: 微型继电器取代计算机网络中的机电和固态光隔离继电器。 微型继电器是一个并联的多个总线开关的集成电路。 每个总线开关都可以断开连接。 总线开关是一个n沟道MOS晶体管，源极和漏极连接到不同的网络总线。 总线使能输入使连接成为或断开。 每个MOS晶体管的每个栅极分别缓冲总线使能输入，以防止总线开关之间的串扰。 由于MOS晶体管在源极处于电源电压的电压电平减去阈值电压时停止导通，因此即使在源极处于供电状态时，升压电压也施加到MOS晶体管的栅极，以允许导通 电压电平。 升压电压由电荷泵产生。 衬底偏置被施加到晶体管以防止来自下冲的串扰。 用于总线开关门的缓冲器是连接到升压电压而不是电源的逆变器，以及基板电压而不是接地。 因此，栅极被驱动到升压电压或基板电压。 为了在连接断开时减少串扰，每个总线开关使用串联的两个晶体管，当总线开关禁用时，中间节点被拉到地，屏蔽总线两侧的两个晶体管和两个网络总线 开关。 外部电容用于降低电荷泵的噪音。