Patent ID: 9543896
Date: 2017-01-10
CPC Classifications: H03D,H04B,H04H,H04L

Claim:
1. A low-noise block downconverter (LNB), comprising: a first input module, for outputting a first intermediate frequency (IF) signal; a second input module, for outputting a second IF signal; a first output module, coupled to the first input module, for amplifying the first IF signal, to output a first user signal to a first user; a second output module, coupled to the second input module, for amplifying the second IF signal, to output a second user signal to a second user; a first input end, coupled to the first input module, for receiving a first polarization signal; and a second input end, coupled to the second input module, for receiving a second polarization signal; wherein a first signal path comprising a first switch and a second signal path comprising a second switch, the first switch is coupled between a first IF amplifier of the first output module and a second output stage of the second output module, a second switch is coupled between a second IF amplifier of the second output module and a first output stage of the first output module; wherein the first input module further comprises a first oscillator, coupled to a first mixer, for generating a first oscillation signal with a first frequency and a second frequency selectively, and the second input module further comprises a second oscillator, coupled to a second mixer, for generating a second oscillation signal with the first frequency and the second frequency selectively; wherein the first mixer selectively outputs a first mixing signal at an IF band after receiving the first polarization signal and the first oscillation signal with the first frequency, and a second mixing signal at the IF band after receiving the first polarization signal and the first oscillation signal with the second frequency; the second mixer selectively outputs a third mixing signal at the IF band after receiving the second polarization signal and the second oscillation signal with the first frequency, and a fourth mixing signal at the IF band after receiving the second polarization signal and the second oscillation signal with the second frequency; wherein the first IF amplifier selectively receives one of the first mixing signal and the second mixing signal to output a first output signal, the second IF amplifier selectively receives one of the third mixing signal and the fourth mixing signal to output a second output signal, the first output stage selectively receives the first output signal and the second output signal to output the first user signal, and the second output stage selectively receives the first output signal and the second output signal to output the second user signal; wherein the LNB outputs the first user signal and the second user signal simultaneously; and wherein the first user signal relates to one of the first mixing signal, the second mixing signal, the third mixing signal and the fourth mixing signal, and the second user signal relates to one of the first mixing signal, the second mixing signal, the third mixing signal and the fourth mixing signal.