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Reducing Coupling Between Input And Output Signals

IP.com Disclosure Number: IPCOM000097314D
Original Publication Date: 1962-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Sobol, H: AUTHOR

Abstract

Many integrated circuits require large amplitude signals for their input and they produce low level output signals. In such circuits, cross talk between the input and the output is a serious problem. This cross talk is minimized by the following technique.

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Reducing Coupling Between Input And Output Signals

Many integrated circuits require large amplitude signals for their input and they produce low level output signals. In such circuits, cross talk between the input and the output is a serious problem. This cross talk is minimized by the following technique.

The different values of the 1 and 0 output signals from the system are represented by signals of different frequencies. For example, as shown in the top drawing a 1 is represented by a relatively low frequency signal. A 0 is represented by a relatively high frequency signal.

There is a minimum amount of cross talk between the input and the output, if the frequencies used to represent the different signals on the output are chosen as the 0's in the frequency spectrum of the input pulse. For example, if the input pulse (middle drawing) has a frequency spectrum as shown in the bottom drawing, frequencies A and B are used to represent the two different output signals.

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