| 摘要 |
A digital tuner is provided to prepare a condenser at a mixer of an MOPLL IC in parallel to form bandwidth of the mixer narrowly, consequently a neighbor channel signal of an intermediate frequency is trapped and the performance of the neighbor channel signal is improved. An MOPLL IC(21) converts a high frequency signal into an intermediate frequency signal by mixing the high frequency signal with an oscillating frequency and outputs the converted intermediate frequency. The MOPLL IC includes an oscillator and a mixer at its inner side, and the oscillator drives oscillation by receiving a reference frequency. The mixer mixes an oscillating frequency of the oscillator with the inputting high frequency signal to output an intermediate frequency. An intermediate frequency filter(22) includes a filter which enhances the in-band property of the intermediate frequency mixed from the mixer. |
