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Browse Prior Art Database

Coupling Network

IP.com Disclosure Number: IPCOM000096803D
Original Publication Date: 1963-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Spiro, H: AUTHOR

Abstract

This is a coupling network for keeping constant the pulse duration in single shot and a stable multivibrators. Coupling condenser C3 connects the collector of transistor T10 to the base of transistor T20, which basically are a single shot multivibrator. In the stable state, T10 is cut off and T20 is conductive. Transistors T1 and T2 of the opposite conductivity type are effective as constant current generators due to their common base voltage. Their collectors are connected to the two plates of G3.

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Coupling Network

This is a coupling network for keeping constant the pulse duration in single shot and a stable multivibrators. Coupling condenser C3 connects the collector of transistor T10 to the base of transistor T20, which basically are a single shot multivibrator. In the stable state, T10 is cut off and T20 is conductive. Transistors T1 and T2 of the opposite conductivity type are effective as constant current generators due to their common base voltage. Their collectors are connected to the two plates of G3.

In the stable state, current 11 produces a stable voltage UC at resistor R3. Current 12 keeps T20 in its conductive condition. If a pulse applied to T10 switches the multivibrator into its unstable state, T10 is rendered conductive. The voltage rise present at C3 due to resistor R3 being shorted, which is of the value UC, is transmitted as a blocking pulse to the base of T20. Now, C3 is oppositely charged by current 12 linearly with respect to time, until blocking voltage UB has again been established at the base of T20.

Thus, the original stable state of the multivibrator is restored. The duration of the quasi stable state, and thus the pulse duration, always remains constant and independent of variations in the operating voltage. This is because at least the ratio between the two currents 11 and 12 remains constant.

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