Integrated circuit having reduced electromagnetic emissions an i

Details Integrated circuit having reduced electromagnetic emissions an i Integrated circuit having reduced electromagnetic emissions an i

1993-05-03

1994-05-31

Pascal, Robert J.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307452, 3072961, 3072966, 307263, H03K 1716

Patent

active

053172078

ABSTRACT:
A circuit is provided that reduces the electromagnetic emissions from an integrated circuit. The circuit includes the resistive portion of an intrinsic low pass filter network and a means for modulating the resistance in response to switching of the integrated circuit nucleus logic elements. The resistance is increased before the nucleus logic elements switch and is gradually decreased upon completion of all switching of the nucleus logic elements. A portion of the transient switching pulse waveform, normally provided by the external power supply, is instead provided by the intrinsic nucleus capacitance associated with the nucleus logic. In particular the high frequency components are sourced by the intrinsic nucleus capacitance. The amplitude and the rise time of the transient switching pulse is thereby reduced. Further reduction in electromagnetic emission is provided by modified output buffers where transient switching waveforms are reduced by current limiting the output switching transistors and providing initial transient current from the intrinsic capacitance associated with the output buffer.

REFERENCES:
patent: 4959562 (1992-03-01), Fukunaga
patent: 4999519 (1991-03-01), Kitsukawa et al.
patent: 5099138 (1990-09-01), Ootani
Mardiguian, M., "Electromagnetic Control in Components and Devices-A Handbook Series on Electromagnetic Interference and Compatibility", Interference Control Technologies, Inc. Gainesville, VA, vol. 5 at pp. 2.36, 6.12 and 9.4-9.21 (1988).

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