Abstract
Phase modulation can most directly be effected by a device whose output is a sinusoidal function of its input. In this paper a phase modulator is described in which a linear segmental approximation of the sinusoidal function is used. Performance results in terms of a phase difference from perfect linearity ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\Delta \Phi</tex> ) and signal-to-distortion ratio (SDR) are given. For eight-segment approximation <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\Delta \Phi</tex> is 0.06° and SDR is 62.3 dB in the range <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\pm90\deg</tex> .
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