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Contact Bounce Integrator

IP.com Disclosure Number: IPCOM000073588D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Petersen, FG: AUTHOR

Abstract

This circuit eliminates multivoltage excursions caused by erratic mechanical contact closure. The waveshape 1 represents the signal level which is introduced to the circuit upon contact closure, not shown. As indicated in waveshape 1, there is a substantial amount of noise which forms part of the signal. This noise is attributed to contact bounce. The positive going waveshape causes the single-shot 20 to turn on by introducing a positive signal through lines 6 and 8. The turning on of the single shot 20 introduces a positive pulse on line 3 and further appears on line 4 through OR gate 22. The negative pulse on line 4 in conjunction with the input on line 9 causes a positive pulse to appear at terminal 5.

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Contact Bounce Integrator

This circuit eliminates multivoltage excursions caused by erratic mechanical contact closure. The waveshape 1 represents the signal level which is introduced to the circuit upon contact closure, not shown. As indicated in waveshape 1, there is a substantial amount of noise which forms part of the signal. This noise is attributed to contact bounce. The positive going waveshape causes the single-shot 20 to turn on by introducing a positive signal through lines 6 and 8. The turning on of the single shot 20 introduces a positive pulse on line 3 and further appears on line 4 through OR gate 22. The negative pulse on line 4 in conjunction with the input on line 9 causes a positive pulse to appear at terminal 5. Then, since lines 1, and 5 are positive and 4 is negative, a feedback signal is provided which switches the single shot 20 via lines 6 and 7, thus conditioning the single shot for operation when the contact opens. The single- shot output 2 is inverted by NOT circuit 24, thus allowing line 4 to be gated by AND gate 26 and provide an output signal on line 10. The output pulse is present after some delay which is sufficient to allow the contact bounce to settle.

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