English: Static characteristic and gain of a linear phase comparator and of a bang-bang phase detector. Both made for comparison of random NRZ data with a clock at the same frequency. Characteristics drawn in case the transition density is 100%.
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Gain of the linear comparator halved to 1/2π = 0.15915494, to be consistent with the definition of the block elsewhere in the book where the figure is used. Minor editing trivia.