A 24 GHz up-converter mixer design with balun circuit

Based on the structure of Gilbert，a 24 GHz up-conversion mixer was designed with three-piece balun circuit on-chip. Using the gm/I method to coordinate the transistor size to obtain better conversion gain, isolation degree and circuit dissipation power. The circuit implementation is adopted by the xiamen san-0.5 μm PHEMT process, 5 V voltage power supply, and the conversion gain is 9 dBm when this LO power is 0 dBm. When work at 24 GHz band, 1 dB compressed point is -20 dBm, the maximum output power of the mixer is -10 dBm, RF output port and the LO port isolation degree is more than 32 dB, the whole circuit DC power consumption of 40 MW，chip area is 1 mm ×1.3 mm.