发明授权
- 专利标题: Transistor construction for low noise output driver
- 专利标题(中): 用于低噪声输出驱动器的晶体管结构
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申请号: US242708申请日: 1988-09-09
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公开(公告)号: US4949139A公开(公告)日: 1990-08-14
- 发明人: George J. Korsh , Edward Hui
- 申请人: George J. Korsh , Edward Hui
- 申请人地址: CA San Jose
- 专利权人: Atmel Corporation
- 当前专利权人: Atmel Corporation
- 当前专利权人地址: CA San Jose
- 主分类号: H01L29/423
- IPC分类号: H01L29/423 ; H03K19/003
摘要:
A transistor construction having a gate electrode meandering in a serpentine manner between interlacked comb-like drain and sources electrodes. The construction is equivalent to parallel transistors with series-connected gates, and the resistivity of the gate electrode forms a RC delay line in which transistors furthest from the gate drivers lag behind those which are closest. Accordingly, the transistor construction turns on or off gradually. The construction is useful as part of a CMOS output driver to memory chips and the like where the inductance of bondwires and the package leads normally cause noise spikes. The transistor construction reduces the current slew rate during switching so that less noise occurs on the chip supply lines. Another embodiment is made up of up to four parallel connected blocks of series-connected-gates. Multiple gate turn-off drivers are provided in a modified output driver, connected in parallel to each series-connected gate block, to insure that the transistor block turns off more rapidly than it turns on.
公开/授权文献
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