A fully integrated 3 to 5 GHz CMOS mixer with active balun for UWB receiver

A fully integrated 34o-5 GHz CMOS mixer for UWB system is presented in this paper. The designed mixer utilizes a dynamic injection circuit to reduce noise figure. In order to adjust the conversion gain, linearity, and noise figure easily, we connect a capacitor and a resistor in series between the drain and the gate of a NMOS transistor. A designed active balun which converts the single-ended input signals to differential signals for UWB is also proposed. The fully integrated mixer is designed and fabricated in 0.18 mu m TSMC technology with 1.27 x 1.14 mm(2) die size. With -30 dBm for 3 similar to 5 GHz input RIP, 0 dBm for 3 similar to 5 GHz input LO, and 100 MHz output baseband frequency, the simulated chip achieves 5 similar to 13 dB conversion gaiti, -4 similar to 2A dBm input intercept point ([IIP3) and 11.7 similar to 13.7 dB noise figure for 1.8 V supply voltage.