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Low Capacitance Reed Relay Switch

IP.com Disclosure Number: IPCOM000091439D
Original Publication Date: 1968-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

McCabe, JF: AUTHOR

Abstract

A plurality of reed relay switches 10 is connected in parallel circuits to common signal input line 11 with separate output lines 12 connected to an external device. Relay coils 13 are individually electrically connected to a suitable switch selector device. When energized, coils 13 activate their respective relay reeds 14 and 15 to close the selected circuit. In applications, e.g., testing, where high-frequency input signals are used, a shunt capacitance due to the inherent capacitance of coils 13 and reeds 14 and 15 in the open circuits causes distortion in the signal through the closed circuit.

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Low Capacitance Reed Relay Switch

A plurality of reed relay switches 10 is connected in parallel circuits to common signal input line 11 with separate output lines 12 connected to an external device. Relay coils 13 are individually electrically connected to a suitable switch selector device. When energized, coils 13 activate their respective relay reeds 14 and 15 to close the selected circuit. In applications, e.g., testing, where high-frequency input signals are used, a shunt capacitance due to the inherent capacitance of coils 13 and reeds 14 and 15 in the open circuits causes distortion in the signal through the closed circuit.

This is eliminated in this switch by arranging coils 13 so that they are located to the right of the contacts points of the reeds 14 and 15. Thus, capacitance coupling from the coil and reeds exists only on the output side of the circuits and is not reflected back into the input signal line.

Multireed relay assembly 20 comprises base block 21 with connectors 22 for receiving external contacts 23 of reed relay capsule 24. Coil assembly block 25, resting on block 21, has apertures 26 for supporting coils 13 concentrically about capsules 24. Upper contacts 27 of capsules 24 are attached to circuit board 28, or the like. Board 28 can be provided with printed electrical connections 29 to contacts 27 of the reed relays. Board 28 with capsules rests on spacer blocks 30 mounted on block 25. Spacer blocks 30 are sized to hold capsules 24 so that...