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    • 7. 发明申请
    • ACTIVE TERMINATION CIRCUIT AND METHOD THEREFOR
    • 主动终止电路及其方法
    • WO98051046A1
    • 1998-11-12
    • PCT/US1998/009030
    • 1998-05-07
    • H04L25/02H03K5/007H03K5/08
    • H04L25/0278H04L25/0298
    • An active termination circuit for terminating a transmission line in an electronic device. The active termination circuit is configured to clamp a voltage level on the transmission line to one of a first reference voltage level and a second reference voltage level. The active termination circuit includes a first clamping transistor coupled to a transmission line terminal and a first terminal. The transmission line terminal is configured to be coupled to the transmission line in the electronic device. The first terminal is configured to be coupled to the first reference voltage level in the electronic device. There is included a second clamping transistor coupled to the transmission line terminal and a second terminal. The second terminal is configured to be coupled to the second reference voltage level in the electronic device. There is also included a first threshold reference device coupled to the first clamping transistor. The first threshold reference device being configured to maintain a base of the first clamping transistor at about VBE lower than the second reference voltage level. There is further included a second threshold reference device coupled to the second clamping transistor, the second threshold reference device being configured to maintain a base of the second clamping transistor at about VBE higher than the first reference voltage level.
    • 一种用于终止电子设备中的传输线的主动终端电路。 有源终端电路被配置为将传输线上的电压电平钳位到第一参考电压电平和第二参考电压电平之一。 有源终端电路包括耦合到传输线端子和第一端子的第一钳位晶体管。 传输线路终端被配置为耦合到电子设备中的传输线路。 第一端子被配置为耦合到电子设备中的第一参考电压电平。 包括耦合到传输线端子和第二端子的第二钳位晶体管。 第二端子被配置为耦合到电子设备中的第二参考电压电平。 还包括耦合到第一钳位晶体管的第一阈值参考器件。 第一阈值参考装置被配置为将第一钳位晶体管的基极保持在比第二参考电压电平低约VBEE。 还包括耦合到第二钳位晶体管的第二阈值参考装置,第二阈值参考装置被配置为将第二钳位晶体管的基极保持在比第一参考电压电平高约VBEE。