Abstract

A balanced single side-band (SSB) mixer employing a sub-harmonic configuration is designed for up and down conversions in K-band. The designed mixer uses anti-parallel diode (APD) pairs to effectively eliminate even harmonics of local oscillator (LO) spurious signal. For the more, to reduce the odd harmonics of LO at RF port, we employ a balanced configuration for LO. The fabricated chip shows 12 ±2dB of conversion loss and image-rejection ratio of about 20dB for down conversion at RF frequencies of 24- 27.5GHz. As an up-conversion mode, the designed chip shows 12dB of conversion loss and image-rejection ratio of 20 ~ 25 dB at RF frequencies of 25 to 27GHz. The odd harmonics of LO are measured below -37dBc.