LOW NOISE BLOCKLNB DOWN CONVERSION CHIP CIRCUIT AND CHIP LNB DOWN CONVERSION CIRCUIT AND METHOD

摘要

The present invention discloses an example of an LNB frequency down conversion integrated circuit. The present invention frequency-down-converts the RF signal to a quadrature local oscillator (LO) and quadrature mixer. After mixing with the passive polyphase filter, the quadrature intermediate frequency (IF) signal is phase shifted by 90 degrees. The present invention further discloses an LNB frequency down conversion chip, an LNB frequency down circuit employing an LNB frequency down conversion chip circuit, and an LNB frequency down method. The present invention performs removal of a mirror image signal and realizes a mirror image suppression function.;