Silicon Motion FC8080 - Manual (Page 8)

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Product datasheet 8/52 Rev.0.95 2013-04-23
FC8080
Terrestrial Digital Multimedia Broadcast
RF tuner & Demodulator
1.3. Block Diagram
Figure 1. FC8080 Block Diagram
1.4. RF Tuner
RF tuner has a direct-conversion structure that converts Band-3 signal around DC frequency. RF
AGC and MIX AGC are controlled by the on-chip demodulator, and they regulate signal level to a
proper value for the internal tuner blocks. The on-chip demodulator controls the gain of the PGA
(Programmable Gain Amplifier), and PGA supply uniform signal to ADC as a result. A low noise
fractional-N type frequency synthesizer and a VCO are integrated for generating LO(Local Oscillator)
signal to direct-conversion.