Frequency synthesizer for DTV receiver, DTV receiver including the synthesizer, and Local oscillator signal generation method for DTV reception

摘要

PURPOSE: A frequency synthesizer for dtv receiver, a dtv receiving device thereof and a local oscillator signal manufacturing method for the same are provided to solve noise problem by switching. CONSTITUTION: A VCO(Voltage Controlled Oscillator)(30) outputs an oscillation signal based on a control voltage. A LO(Local Oscillator) signal generator(40) receives the oscillation signal. The LO signal generator generates LO(Local Oscillator) signal having bandwidth requiring from DTV tuner by using a plurality of frequency dividers and a channel interval. A pre-scaler(50) separates the output signal of the LO signal generator into 1/N interval signal. The Pre-scaler inputs the separated signal to a phase frequency detecting unit.