Dynamic power sharing zero intermediate frequency (ZIF) mixer and method of forming same

摘要

A zero intermediate frequency (ZIF) radio frequency (RF) digital mixer ( 200 ) includes a low noise amplifier (LNA) ( 203 ), a first RF mixer stage ( 205 ) for mixing an RF signal from the at least one LNA with a first local oscillator signal operating a first predetermined frequency. A second RF mixer stage ( 207 ) is then utilized for mixing in-phase (I) and quadrature (Q) digital signals from the first RF mixer stage ( 205 ) with a plurality of second local oscillator signals (LO) operating at a second predetermined frequency. The invention significantly improves current drain by eliminating the need for a linear transconductance stage while still maintaining high degrees of isolation and linearity.