| 摘要 |
PURPOSE: A 3-band tracking filter for a digital satellite broadcasting tuner is provided to connecte diodes in series for minimizing a capacity of each diode and accurately performe a switching. CONSTITUTION: First to third input switching units(100,300,500) are switched according to a band switching signal and a voltage(B+). First to third output switching units(200,400,600) are switched according to an other band switching signal for preventing an error operation of the first to third input switching units(100,300,500).
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