Patent ID: 6861891

Claim:
A sub-harmonic mixer comprising: first and second field effect transistors (FETs) each having a gate, a source and a drain, the source of the first FET being connected to the source of the second FET and the drain of the first FET being connected to the drain of the second FET; input means coupled to said drains for receiving an input signal for the mixer; signal generating means for generating a local oscillator (LO) signal and coupled to the gate of one of said first and second FETs, means for maintaining the potential of the gate of the other of said first and second FETs at a substantially constant value relative to the LO signal applied to the gate of said one FET, said FETs being arranged to permit said LO signal applied to the gate of said one FET to drive a voltage across the gate-source of each of said first and second FETs, and output means coupled to said drains for outputting an output signal from the mixer.