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Variable Rise Time Control Device

IP.com Disclosure Number: IPCOM000050414D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Cole, JN: AUTHOR [+2]

Abstract

A device for altering the rise time of pulses is shown in Fig. 1, where a lossy magnetic material 10 is located in coaxial transmission line 12. Depending upon the amount of flux provided by the lossy magnetic material 10, the rise time of the input pulse is altered.

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Variable Rise Time Control Device

A device for altering the rise time of pulses is shown in Fig. 1, where a lossy magnetic material 10 is located in coaxial transmission line 12. Depending upon the amount of flux provided by the lossy magnetic material 10, the rise time of the input pulse is altered.

Figs. 2A and 2B show the affect of the device of Fig. 1. The pulse of Fig. 2A is a pulse that would be present at the output of the coaxial line 12 if the lossy ferrite bead 10 were not in the line. The pulse shown in Fig. 2B is the output pulse when the ferrite bead 10 is present.

Figs. 3 and 4 show devices that provide means for controlling the rise time. In Fig. 3, ferrite bead 10 has a second hole through it for accommodating electrical line 14. Application of a DC control current on line 14 will provide means for altering the total magnetic flux, which in turn will alter the affect on the pulse rise time.

Fig. 4 shows the use of a split ferrite bead, comprising two halves 16A and 16B, where ferrite bead half 16A is fixed, while ferrite bead half 16B can be moved along the length of coaxial line 18 using positioning means 20. In this manner, the degree to which ferrite halves 16A and 16B overlap can be varied in order to alter the total magnetic flux.

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