Design of Down Conversion Circuit of DVB-T Receiver Front-end
Zongsheng Lai · Video Engineering · 2010
The basic theory of down conversion of DVB-T receiver front-end is introduced in this paper. A circuit of down conversion from DVB-T RF to baseband is designed. The basic principle of the circuit is as follows, the tuner converts the RF signals to IF signals,and the A/D converter performs the bandpass sampling and converts the IF signals to baseband signals. The control part of the circuit is composed of an MCU and a D/A converter. This circuit achieves the conversion of the DVB-T RF signal, and acquires the DVB-T digital baseband signal.