| 摘要 |
PURPOSE: A tuner with a ripple removing circuit is provided to supply a tuning voltage which removes a ripple component of a power supply unit to each circuit block of the tuner, thereby improving tuning properties of the tuner. CONSTITUTION: When a tuning voltage is applied to a tuner(10), a ripple removing circuit(11) removes a ripple component of a tuning voltage supply line. When a ripple component-removed tuning voltage is applied, a tuning IC(Integrated Circuit)(12) converts a frequency corresponding to a selected channel of a user from an input RF signal into an IF(Intermediate Frequency). A demodulation IC(13) demodulates the outputted intermediate frequency of the tuning IC. The demodulation IC detects a broadcast signal of a baseband.
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