Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Slope control of leading or trailing edge of rectangular or...
Patent
1995-05-30
1997-08-12
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Slope control of leading or trailing edge of rectangular or...
327108, H03K 512
Patent
active
056569602
ABSTRACT:
A controlled-slope output buffer is furnished to reduce electro-magnetic interference (EMI) and ground bounce noise which commonly arises in output buffers in a VLSI chip. In the controlled-slope buffer, output current pulses are shaped to reduce higher frequency signal components. Corrective shaping of the electrical signals by the controlled-slope buffer is effective in reducing EMI emissions in a frequency range from 200 to 1000 MHz. Output signals of the controlled-slope output buffer have voltage slopes which are substantially the same as output signals generated by conventional output buffers. However, the controlled-slope output buffer generates output signals in which the shape of the current pulse is greatly improved for reducing EMI and ground bounce noise. In the controlled-slope buffers according to the present invention, current pulses have a triangular shape when they are drawn in the time domain. This shape of current pulse results in the lowest achievable time derivative for a given capacitive load. Current pulses having this shape also reduce ground bounce levels in an integrated circuit chip.
REFERENCES:
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patent: 5319252 (1994-06-01), Pierce et al.
patent: 5432471 (1995-07-01), Maiumdar et al.
patent: 5451861 (1995-09-01), Giebel
R. Senthinathan and J.L. Pierce, "Application Specific CMOS Output Driver Circuit Design Techniques to Reduce Simultaneous Switching Noise", IEEE Journal of Solid-State Circuits, vol. 28, No. 12, Dec. 1993, pp. 1383-1388 .
Callahan Timothy P.
National Semiconductor Corporation
Zweizig Jeffrey
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