A single-ended-to-differential mixer includes a differential pair amplifier, a passive current source, a cancellation sub-circuit, and a mixer. The differential pair amplifier is configured to receive a single-ended input signal. The differential pair amplifier includes a first input, a second input, a first output, and a second output. The passive current source is connected between (i) the differential pair amplifier and (ii) a reference potential. The cancellation sub-circuit is connected to each of the first input, the second input, the first output, and the second output of the differential pair amplifier. The cancellation sub-circuit is configured to at least partially cancel a non-linearity of the differential pair amplifier. The mixer is connected to each of the first output and the second output of the differential pair amplifier.