Oscillator Feedthrough Mitigation for Multiple Mixers

Wireless circuitry comprising:

• an impedance matching circuit;
• a first mixer coupled to the impedance matching circuit and configured to receive an oscillating signal with an oscillation frequency;
• and
• a first transmission line path having a first end coupled to the impedance matching circuit and having a second end coupled to an input of the first mixer, wherein the first transmission line path comprises:
• a first transmission line configured to convey a signal to the input of the first mixer;
• a second transmission line configured to convey a signal to the input of the first mixer;
• and
• a floating transmission line interposed between the first and second transmission lines and configured to reject signals with a frequency equal to a multiple of the oscillation frequency.

Circuitry comprising:

• a matching network;
• a first mixer coupled to the matching network via a first transmission line path and configured to receive an oscillating signal;
• a second mixer coupled to the matching network via a second transmission line path;
• and
• one or more filter capacitors coupled to a node between the first mixer and the first transmission line path and configured to filter spurious signals, associated with the oscillating signal, at the node.