| 摘要 |
PURPOSE: A circuit for controlling an automatic gain of a digital intermediate frequency is provided to restrain a noise signal by passing only a digital IF signal. CONSTITUTION: An MOPLL IC(MOPLL(Mixer+Oscillator+PLL) IC(Integrated Circuit))(102) converts an inputted digital radio frequency signal into a digital IF signal. A filter unit(104) filters the converted digital IF(Intermediate Frequency) signal, and an amplification unit(106) compensates the filtered digital IF signal as much as the lost gain caused by amplification. A BPF(Band Pass Filter) for digial IF(108) passes only the amplified digital IF signal. A digital demodulation IC(110) demodulates the filtered digital IF signal.
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