LNB FREQUENCY DOWN CONVERSION INTEGRATED CIRCUIT AND CHIP, LNB FREQUENCY DOWN CONVERSION CIRCUIT AND METHOD

摘要

A Low Noise block (LNB) down conversion chip circuit is disclosed. The solution performs a down conversion on a radio frequency signal utilizing a quadrature local oscillation signal and a quadrature mixer, and then performs a 90 degrees phase shift on a mixed quadrature intermediate frequency signal utilizing a passive multiphase filter. A LNB down conversion chip, LNB down conversion circuit with the LNB down conversion chip circuit and LNB down conversion method are also disclosed. With this application, an image signal is filtered, and image signal suppression is implemented.