A scheme for simultaneous down-conversion and linearisation of radio-frequency (RF) signals is proposed and demonstrated. Based on carrier-suppressed double-sideband modulation, the input RF signal can be down-converted to any intermediate frequency (IF) tone in the range of 8–12 GHz. Compared with the down-conversion scheme with two cascaded intensity modulators, the proposed scheme has improvement of >21 dB of the suppression ratio of third-order intermodulation distortion and 6.17 dB of spurious-free dynamic range.