The Ideal Modulator/Demodulator (1977)

By Carl T. Johnson, Jerrold Electronics Corporation

The first step in evaluating the baseband performance of a head-end modulator is to obtain an "ideal" demodulator. Otherwise, shortcomings of the test equipment and those of the device under test will be difficult to separate, A similar requirement plagues the evaluation of the head-end demodulator. In this case the "perfect" modulator is needed. But what is "perfect"? How are the "perfect" instruments tested? This paper answers these questions.

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