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Multivibrators with Synchronized Outputs

IP.com Disclosure Number: IPCOM000094458D
Original Publication Date: 1965-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Clapper, GL: AUTHOR

Abstract

This arrangement provides synchronization between the outputs of a multivibrator to prevent overlapping, so that the output waveforms are perfectly complementary. The transistors T2 and T3 are connected in a conventional cross coupled multivibrator configuration with inverter output drivers T1 and T4 connected to the collector load circuits of the multivibrator transistors.

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Multivibrators with Synchronized Outputs

This arrangement provides synchronization between the outputs of a multivibrator to prevent overlapping, so that the output waveforms are perfectly complementary. The transistors T2 and T3 are connected in a conventional cross coupled multivibrator configuration with inverter output drivers T1 and T4 connected to the collector load circuits of the multivibrator transistors.

Synchronization is accomplished by a single capacitor C connected between the collector load circuits comprising resistors R1 and R3 for transistor T2 and R2 and R4 for transistor T3. Capacitor C, in combination with the load resistors, provides a time delay that is longer than the transition time of the transistors. The turnoff of one transistor and the turnon of the other transistor occur simultaneously through the coupling action of the capacitor.

Since a single capacitor C is employed to control the delays of both multivibrator transistors, the effect of variations in capacitors caused by temperature changes, aging and so forth is practically eliminated.

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