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1. 发明申请

US20030189455A1 CMOS transmission gate with high impedance at power off 失效
标题翻译： CMOS传输门在断电时具有高阻抗
公开(公告)号：US20030189455A1
公开(公告)日：2003-10-09
申请号：US10119101
申请日：2002-04-08
申请人： Exar Corporation
发明人： Bahram Fotouhi
IPC分类号： H03K017/00
CPC分类号： H03K17/302 , H03K17/6872 , H03K2217/0018
摘要： A transmission gate circuit with high impedance during power off conditions, which includes a first transistor coupled between a first terminal and a second terminal and a second transistor coupled between the first terminal and the second terminal. Also included is a control circuit configured to monitor voltages on the first terminal and on a first voltage source, the control circuit configured to couple the gates of the first and second transistors to a voltage that will keep the first and second transistors off during power off conditions.
摘要翻译：一种在断电条件下具有高阻抗的传输门电路，其包括耦合在第一端子和第二端子之间的第一晶体管和耦合在第一端子和第二端子之间的第二晶体管。还包括一种控制电路，其被配置为监测第一端子上和第一电压源上的电压，该控制电路被配置为将第一和第二晶体管的栅极耦合到在断电期间将使第一和第二晶体管保持关闭的电压条件。

2. 发明申请

US20020089801A1 Short circuit power limiter 有权
标题翻译：短路功率限制器
公开(公告)号：US20020089801A1
公开(公告)日：2002-07-11
申请号：US09757987
申请日：2001-01-09
申请人： Exar Corporation
发明人： Robert Alan Brannen , Bahram Fotouhi
IPC分类号： H02H009/02
CPC分类号： H03F1/52
摘要： The present invention provides a short circuit power limiter circuit having a current sensor and a power limiter. The short circuit sensor sends a short circuit flag signal to the power limiter when the short circuit sensor detects a short circuit condition in a target circuit. The power limiter then reduces the power consumption of the target circuit. In a specific example, the power limiter toggles a particular portion of the target circuit on and off to reduce the circuit's average short circuit power consumption. This cycle is repeated as long as a short circuit condition exists.
摘要翻译：本发明提供一种具有电流传感器和功率限制器的短路功率限制器电路。当短路传感器检测到目标电路中的短路状况时，短路传感器向功率限制器发送短路标志信号。功率限制器然后降低目标电路的功耗。在具体示例中，功率限制器切换目标电路的特定部分的开和关，以减少电路的平均短路功耗。只要存在短路状况，就重复该循环。

3. 发明申请

US20040046598A1 I/O PAD OVERVOLTAGE PROTECTION CIRCUITRY 有权
标题翻译： I / O PAD OVERVOLTAGE保护电路
公开(公告)号：US20040046598A1
公开(公告)日：2004-03-11
申请号：US10241115
申请日：2002-09-10
申请人： Exar Corporation
发明人： Bahram Fotouhi , Bahman Farzan , Saied Rafati
IPC分类号： H03L005/00
CPC分类号： H03K19/00315
摘要： A protection circuit for a transmission gate having a PMOS transmission gate transistor and an NMOS transmission gate transistor coupled between a core circuit and an I/O pad. Biasing transistors are coupled to gates of the NMOS and PMOS transmission gate transistors to turn them on during normal operation. A protection circuit will turn off the NMOS and PMOS transmission gate transistors when the voltage at the pad exceeds the supply voltage by more than a threshold amount. This protection circuit includes a first protection transistor coupled between the gates of the biasing transistors and the pad to turn the biasing transistors off when the voltage on the pad exceeds the supply voltage by more than the threshold amount.
摘要翻译：一种用于传输门的保护电路，其具有耦合在核心电路和I / O焊盘之间的PMOS传输栅极晶体管和NMOS传输栅极晶体管。偏置晶体管耦合到NMOS和PMOS传输门晶体管的栅极，以在正常操作期间将其导通。当焊盘处的电压超过电源电压超过阈值时，保护电路将关断NMOS和PMOS传输门晶体管。该保护电路包括耦合在偏置晶体管的栅极和焊盘之间的第一保护晶体管，当焊盘上的电压超过电源电压超过阈值量时，偏压晶体管截止。

4. 发明申请

US20030169068A1 Input termination with high impedance at power off 有权
标题翻译：断电时具有高阻抗的输入端接
公开(公告)号：US20030169068A1
公开(公告)日：2003-09-11
申请号：US10093227
申请日：2002-03-05
申请人： Exar Corporation
发明人： Bahram Fotouhi
IPC分类号： H03K019/003
CPC分类号： H03K19/007
摘要： An input termination circuit with high impedance at power off, which includes a first transistor coupled between a first terminal and a second terminal. The input termination circuit also includes a control circuit that monitors voltages on the first and second terminals and a first voltage source. During power off conditions, the control circuit couples the gate of the first transistor to a voltage that will keep the first transistor off. The first transistor remains off even when the voltage levels at the first and second terminals vary wildly.
摘要翻译：一种在断电时具有高阻抗的输入终端电路，其包括耦合在第一端子和第二端子之间的第一晶体管。输入终端电路还包括监测第一和第二端子上的电压的控制电路和第一电压源。在断电条件期间，控制电路将第一晶体管的栅极耦合到将保持第一晶体管截止的电压。即使当第一和第二端子处的电压电平变化很大时，第一晶体管保持关断。

5. 发明申请

US20030071660A1 POWER DOWN CIRCUIT FOR HIGH OUTPUT IMPEDENCE STATE OF I/O DRIVER 有权
标题翻译：用于I / O驱动器的高输出阻抗状态的掉电电路
公开(公告)号：US20030071660A1
公开(公告)日：2003-04-17
申请号：US09978255
申请日：2001-10-15
申请人： Exar Corporation
发明人： Loi Thanh Le , Pekka Ojala , Bahram Fotouhi
IPC分类号： H03B001/00
CPC分类号： H03K19/00315
摘要： A circuit for putting an output driver into a high impedance state upon failure of the power supply. This is accomplished by providing a first transistor that is connected between the power supply and the n-well to charge the n-well node of the PMOS drive transistor. Upon failure of the supply voltage, a number of transistors are connected to couple the n-well and a gate of the PMOS drive transistor to the output line, so that they track the voltage level of the output, thereby preventing forward biasing of the Pnull/n-well diode.
摘要翻译：一种用于在电源故障时将输出驱动器置于高阻态的电路。这是通过提供连接在电源和n阱之间以对PMOS驱动晶体管的n阱节点充电的第一晶体管来实现的。当电源电压失效时，连接多个晶体管以将n阱和PMOS驱动晶体管的栅极耦合到输出线，使得它们跟踪输出的电压电平，从而防止P + / n阱二极管。

6. 发明申请

US20020093366A1 Wide-band replica output current sensing circuit 有权
标题翻译：宽带复制输出电流检测电路
公开(公告)号：US20020093366A1
公开(公告)日：2002-07-18
申请号：US10011564
申请日：2001-11-05
申请人： Exar Corporation
发明人： Bahram Fotouhi
IPC分类号： H03B001/00
CPC分类号： H03K19/00315
摘要： An indirect current sensing circuit and method for replicating an output current is disclosed. The present invention is capable of preventing device damage and circuit disruption by maintaining output voltage signal integrity and consuming negligible power as well as optimizing output impedance. Furthermore, the indirect current sensing circuit and method is independent of semiconductor process variations and thus is more reliable over prior art current sensing techniques. The indirect current sensing circuit and its method of current limiting and output impedance optimization, according to the present invention, can reliably drive transmission lines in networking system and communication applications.
摘要翻译：公开了一种用于复制输出电流的间接电流检测电路和方法。本发明能够通过保持输出电压信号完整性并消耗可忽略的功率以及优化输出阻抗来防止设备损坏和电路中断。此外，间接电流检测电路和方法与半导体工艺变化无关，因此比现有技术的电流检测技术更可靠。根据本发明的间接电流检测电路及其电流限制和输出阻抗优化方法可以可靠地驱动网络系统和通信应用中的传输线。

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