发明名称 |
CMOS output buffer providing high drive current with minimum output signal distortion |
摘要 |
A CMOS output buffer provides high drive current without sacrificing speed and with minimum output signal distortion due to internal chip ground bounce or output signal ringing. The output buffer includes a pull-up circuit and a pull-down circuit which distribute switching current spikes over time. The pull-up circuit includes a P-channel FET and an N-channel FET connected in parallel between an output terminal and supply terminal VDD, with an inverter connected between the gates of the N-channel and P-channel FETs to provide the proper phase for the P-channel FET as well as delaying turn-on of the P-channel FET with respect to turn-on of the N-channel FET. The pull-down circuit includes a pair of N-channel FETs connected in parallel between the output terminal and ground, and a delay resistance connected between their gates so that turn-on of one of the N-channel FETs is delayed with respect to the other.
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申请公布号 |
US4638187(A) |
申请公布日期 |
1987.01.20 |
申请号 |
US19850782639 |
申请日期 |
1985.10.01 |
申请人 |
VTC INCORPORATED |
发明人 |
BOLER, CLIFFORD H.;LEAKE, WILLIAM W.;RAI, SURINDER S.;ZEMSKE, GENE B. |
分类号 |
H03K19/00;H03K19/003;H03K19/017;H03K19/0185;H03K19/094;H03K19/0948;(IPC1-7):H03K21/10 |
主分类号 |
H03K19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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