Mixer with reduced local oscillator (LO) leakage

A mixer, comprising:

• a mixing stage;
• a first transistor, wherein a gate of the first transistor is coupled to a first input of the mixer, and a drain of the first transistor is coupled to the mixing stage;
• a second transistor, wherein a gate of the second transistor is coupled to a second input of the mixer, and a drain of the second transistor is coupled to the mixing stage;
• a first source resistor coupled to a source of the first transistor;
• a second source resistor coupled to a source of the second transistor;
• and
• an amplifier having a first input, a second input, a first output, and a second output, wherein the first input of the amplifier is coupled to the source of the first transistor, the second input of the amplifier is coupled to the source of the second transistor, the first output of the amplifier is coupled to a back gate of the first transistor, the second output of the amplifier is coupled to a back gate of the second transistor, and the amplifier is configured to adjust a first bias voltage at the back gate of the first transistor and a second bias voltage at the back gate of the second transistor in a direction that reduces a differential voltage between the first input of the amplifier and the second input of the amplifier.