Abstract: The dynamic current injection,the common source node resonance,improved two order linearity performance technology,and CMOS technology being applied,an active folding Gilbert zero IF mixer with the supply voltage at 1.8 V was designed.The circuit simulation showed that at 1 MHz,the SSB noise figure of the mixer was 6.109 dB;at 100 kHz,the SSBNF was 6.71 dB;and at 10 kHz,10.631 dB.Frequency conversion gain was 11.389 dB;input three order intermodulation point was 4.539 dBm.

Key words: Gilbert mixer, zero IF, CMOS process, design