Double-balanced mixer

A double-balanced mixer, comprising:

• a coupling transformer, configured to receive a first input signal and generate at least one set of signals with opposite voltage phases;
• a first diode cascade circuit, coupled to the coupling transformer and configured to receive a first voltage signal and a second voltage signal that are related to the at least one set of signals with opposite voltage phases, and a first coil end signal that is related to a second input signal, so as to generate a first output end signal, and generate a first node voltage according to a first set of bias voltages;
• a second diode cascade circuit, coupled to the coupling transformer and configured to receive a third voltage signal and a fourth voltage signal that are related to the at least one set of signals with opposite voltage phases, and a second coil end signal that is related to the second input signal, so as to generate a second output end signal, and generate a second node voltage according to a second set of bias voltages;
• and
• a first set of coils, coupled to the first diode cascade circuit to receive the first node voltage and coupled to the second diode cascade circuit to receive the second node voltage, and configured to generate the first coil end signal and the second coil end signal according to the second input signal, and generate an output signal according to the first output end signal and the second output end signal,
• wherein the first node voltage is equal to the second node voltage.