Browse Prior Art Database

Multivibrator

IP.com Disclosure Number: IPCOM000091841D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Luetze, WO: AUTHOR

Abstract

This circuit renders a multivibrator essentially independent of aging of semiconductor devices, fluctuations in the voltages +V and -V, and ambient temperature. The collectors of transistors T1 and T2 each control an associated AVC amplifier consisting of an emitter-follower T5 or T6. The output of each emitter-follower T5 and T6 is coupled to the bases of associated T1 and T2 by a diode D1 or D2. Each T1 or T2, in conjunction with an associated reference potential transistor T3 or T4, forms a current switch. Switching of the multivibrator causes the collector potentials of T1 and T2 to be compared with each of the associated base potentials. At the same time, the rising base voltage of T1 and T2 is clamped if the associated reference potential concurs with the base potential of the corresponding T5 or T6.

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Multivibrator

This circuit renders a multivibrator essentially independent of aging of semiconductor devices, fluctuations in the voltages +V and -V, and ambient temperature. The collectors of transistors T1 and T2 each control an associated AVC amplifier consisting of an emitter-follower T5 or T6. The output of each emitter-follower T5 and T6 is coupled to the bases of associated T1 and T2 by a diode D1 or D2. Each T1 or T2, in conjunction with an associated reference potential transistor T3 or T4, forms a current switch. Switching of the multivibrator causes the collector potentials of T1 and T2 to be compared with each of the associated base potentials. At the same time, the rising base voltage of T1 and T2 is clamped if the associated reference potential concurs with the base potential of the corresponding T5 or T6. This ensures an ideal threshold as an operating point for T5 and T6. While the output can be tapped at terminals A1 and A4, connected to the collectors of T1 and T2, and the terminals A2 and A3, linked with the collectors of T3 and T4, only terminals A1 and A4, connected to the multivibrator transistor collectors, are used as input terminals.

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