Patent ID: 7042960
Filing Date: 2006-05-09
Classification: H03D

Abstract:
1. A mixer topology configured to reduce predetermined spurious output signals, the mixer topology comprising: an input coupler having an input port for receiving a first signal having a frequency f a local oscillator (LO) coupler having an input port for receiving a local oscillator signal having a frequency f an intermediate frequency (IF) coupler with two input ports and output port, said IF coupler configured with predetermined phase shifts between said two input ports and said output port; a first mixer having two input ports and an output port, said input ports of said first mixer each electronically coupled to one of said two input ports of said input coupler and one of said output port of said LO coupler, said output port of said first mixer electrically coupled to one of said two input parts of said IF coupler; and a second mixer having two input ports and an output port, said input ports of said second mixer each electrically coupled to the other of said two input ports of said input coupler and the other output port of said LO coupler, said output port of said second mixer electrically coupled to the other of said two input ports of said IF coupler, wherein said input coupler, LO coupler and IF coupler and said first and second mixers are configured to cancel one or more output signals of said first and second mixers other than f