Patent ID: 9520833
Filing Date: 2016-12-13
CPC Classification: H03D,H04B

Claim Text:
1. A method of mixing an RF signal comprising: receiving a first signal at a first port of an active ring mixing circuit; receiving a second signal at a second port of the active ring mixing circuit; biasing transistors arranged in a ring as plural transistor pairs into an active region where the transistors operate with amplification with a DC voltage applied to the second signal, wherein the transistors are FET and the active region is a saturation region; modifying a transconductance of the plural transistor pairs near a quiescent operating point to substantially maintain the plural transistor pairs in the active region; combining the first and second signals to produce a mixed signal; outputting the mixed signal at an output port of the active ring mixing circuit; and providing negative feedback through a source of the FET, wherein the first port is electrically connected to the source of the FET adapted to received a radio frequency signal.