NDLI: A Transistorized Directional Coupler

Content Provider	IEEE Xplore Digital Library
Author	Denoth, F. Pellegrini, B.
Copyright Year	1963
Description	In previous papers an active directional coupler using a triode, [1],[2] and its use in a bidirectional broad-band amplifier, [3] has been described. It is obvious that it is important to investigate how such a device can be realized using semiconductor techniques. The use of transistors in directional couplers creates new problems due to the variability of transistor parameters. In this paper a transistorized directional coupler that exhibits high directivity over a broad band and a tight coupling coefficient is described. The problems of stability and nonlinear distortion are discussed and overcome by using feedback. Noise problems are also treated. The use of such a coupler in bidirectional amplifiers is also proposed. For this use, the problem of the long-term stabilization of the directivity of the active coupler has been overcome by means of a control system using a reference signal. Experimental results concerning directivity and bandwidth confirm the possibility of a practical use of the proposed amplifier in bidirectional broad-band communication systems.
Starting Page	177
Ending Page	184
Page Count	8
File Size	988251
File Format	PDF
ISSN	00189324
Volume Number	15
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1968-09-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Directional couplers Voltage Couplings Coils Bridge circuits Transmission line theory Equivalent circuits Stability Nonlinear distortion Feedback
Content Type	Text
Resource Type	Article
Subject	Engineering

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