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The Effect of Transformers on Transmission of Digital Audio Signals

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Transformers used in the transmission of digital audio signals affect signal fidelity, interference susceptibility, and conducted EMI emission. Commercially-available transformers specified for digital audio exhibit vast differences in performance. Transmission standards often specify only transformer ratio and bandwidth, and ignore many other parameters which affect critical applications. This paper reviews the function, parameters and performance of digital audio transformers, and presents data on frequency response, pulse aberration, common mode rejection ratio, and jitter. It also discusses several applications and compares a number of transformers in detail.

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