Patent ID: 8291455
Filing Date: 2012-10-16
Classification: H03D

Abstract:
1. A band converter used for receiving a down-converted input signal, the down-converted input signal having a first data signal located at a first frequency band, a second data signal located at a second frequency band, and a third data signal located at a third frequency band, the third frequency band being higher than the second frequency band, and the second frequency band being higher than the first frequency band, the band converter comprising: a band-pass filter, for performing a band-pass filtering upon the down-converted input signal to generate a first filtered signal, wherein the first filtered signal comprises the second data signal located at the second frequency band; a band-stop filter, for performing a band-stop filtering upon the down-converted input signal to generate a second filtered signal, wherein the second filtered signal comprises the first data signal located at the first frequency band and the third data signal located at the third frequency band; a first power distributor, coupled to the band-stop filter, for generating a first separation signal and a second separation signal according to the second filtered signal; a local oscillator, for providing a local oscillating signal; a mixer, coupled to the first power distributor and the local oscillator, for adjusting a frequency of the second separation signal according to the local oscillating signal so as to generate an up-converted second separation signal; a switch circuit, coupled to the first power distributor and the mixer, for selecting one signal from the first separation signal and the up-converted second separation signal according to a selecting signal, and for outputting an output signal; a high-pass filter, coupled to the switch circuit, for performing a high-pass filtering upon the output signal to generate a third filtered signal; a second power distributor, coupled to the band-pass filter and the high-pass filter, for merging the first filtered signal and the third filtered signal to generate a merged signal; and a low-pass filter, coupled to the second power distributor, for performing a low-pass filtering upon the merged signal to generate a fourth filtered signal.