Frequency change arrangement and radio frequency tuner
作者： Nicholas Cowley , Ali Isaac
DOI:
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摘要: A frequency changer arrangement is provided for a radio tuner. The comprises first quadrature converting desired input channel to zero or near-zero intermediate in-phase and signals. These signals are filtered by low pass filters, whose turnover frequencies may be varied so as vary the bandwidth. second upconverts supplies these summer. resulting output determined of commutation in that continuously allow any selected.
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