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Signal standardization and control directivity are emphasized as the basic physical requirements in considering components and circuit techniques for the handling of digital information. The significance and the ways and means of meeting these requirements are most revealing when illustrated by the operations of the parametric phase-locked oscillator and the tunnel diode. A categorical listing of digital-gain elements, accompanied by illustrative comments, is presented to offer a unified viewpoint on digital components and circuit techniques in connection with present-day practice and prospective future development.
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Arthur W. Lo (1961) studied this question.
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