Patent ID: 7570936

Claim:
A mixing circuit, comprising: a first field effect transistor (FET) having a gate, a source and a drain, the source of the first FET connected to a ground node, and the drain of the first FET connected to a first common node, wherein the first common node is coupled to a port of a diplexer; a first capacitor coupling the gate of the first FET to a first output of a balun transformer; a second FET having a gate, a source and a drain, the source of the second FET connected to the ground node, and the drain of the second FET connected to the first common node; a second capacitor coupling the gate of the second FET to a second output of the balun transformer; a third FET having a gate, a source and a drain with the gate of the third FET coupled to a second common node; a fourth FET having a gate, a source and a drain with the gate of the fourth FET coupled to the second common node; a third capacitor coupling the second common node to the first common node; a resistor coupling the second common node to the gate of the first FET; and another resistor coupling the second common node to the gate of the second FET.