Mixer with high order intermodulation suppression and robust conversion gain

Claim 1

A high frequency mixer circuit, comprising: a radio frequency (RF) matching network, for suppression of even order intermodulation, with an input RF-in and an output; a buffer/interstage matching network, for suppression of even order intermodulation, with an input LO-in and an output; a downmixer, for frequency shifting to an intermediate frequency (IF) signal and amplifying said IF signal, with an input G 1 , an input G 2 , and an output Y, said downmixer further comprising a dual-gate mixer, for frequency shifting to said IF signal, said dual-gate mixer having said input G 1 , said input G 2 , and an output X, said dual-gate mixer further comprising a first and a second metal epitaxial field effect transistor (MESFET), where the drain of said first MESFET and the source of said second MESFET are connected to said output X, and an IF amplifier, to amplify said IF signal, said IF amplifier having an input and said output Y, said input of said IF amplifier connected to said output X; an output matching network with an input connected to said output Y, and an output IF-out, said output matching network for matching the impedance of said output Y of said downmixer to the impedance of said output IF-out; a power supply; and a reference potential.