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Paper
Active DC Directional Couplers
Abstract
Active dc directional couplers which are combinations of conventional transmission line attenuator networks and dc amplifiers are described. The circuits of and design equations for signal-detecting and signal-injecting directional couplers with responses which are inherently flat from dc to an amplifier-dependent upper frequency limit are presented. Copyright © 1976 by The Institute of Electrical and Electronics Engineers, Inc.