Patent ID: 8139684
Filing Date: 2012-03-20
Classification: H04L

Abstract:
1. A radio frequency (RF) front-end in an RF receiver receiving at least two RF signals with different transmission bandwidths, comprising: at least two RF tuners receiving, amplifying, and frequency-converting the at least two RF signals, respectively; a switch selecting one of signals output from the at least two RF tuners; a channel filter eliminating interference signals included in a signal output from the switch, and outputting a signal of a transmission band; and an analog to digital converter converting the signal output outputted from the channel filter into a digital signal; a fixed sampling frequency generator generating and transferring a fixed sampling frequency to the analog to digital converter, wherein each of the RF tuners includes: an antenna receiving one of the at least two RF signals; a low-noise amplifier amplifying the received RF signal and reducing noise generated in the amplification process; a frequency mixer converting the amplified signal output from the low-noise amplifier into an intermediate frequency band; a frequency generator generating a frequency signal for converting the amplified RF signal output from the low-noise amplifier into an intermediate frequency band, and providing the generated frequency signal to the frequency mixer; and a gain amplifier amplifying an output signal of the frequency mixer, wherein the channel filter filters the output signal of the switch based on a transmission bandwidth of a signal with the widest transmission bandwidth among the at least two RF signals, and the fixed sampling frequency generator generates the fixed sampling frequency based on the transmission bandwidth of the signal with the widest transmission bandwidth among the at least two RF signals.