Analog front end for DTV, DTV system having the same, and operation methods thereof

摘要

Provided is an analog front end of a digital TV, a digital TV system having the same, and a method of operating the same. The analog front end includes: a first selection circuit which selectively outputs differential sound intermediate frequency signals or differential TV broadcast signals in response to a first selection signal; a second selection circuit which outputs a clock signal among a plurality of clock signals having a different sampling frequencies, in response to a second selection signal; and an analog-to-digital converter which converts output signals output from the first selection circuit to a digital code, according to a sampling frequency of a clock signal output from the second selection circuit.

主权项

1. A signal processing circuit comprising:
an analog-to-digital converter which converts differential analog signals to a digital code, in response to a sampling clock signal input to the analog-to-digital converter; a fractional-N phase locked loop (PLL) which receives a clock signal as an input clock signal; and a first selector which receives the clock signal and an output clock signal output from the fractional-N PLL, and which selectively outputs, in response to a first selection signal, one of the received clock signal and the received output clock signal as the sampling clock signal.