Based on Gilbert unit

this paper uses a 0.18μm CMOS process to design a high gain

low noise down -conversion double balanced mixer which works in 5.25GHz.In order to reduce the current through the switch transistor and load

and to remit the limit of voltage margin and consumption

a current injection technology is used in this mixer;A resonant inductance is used to restrain the charging and discharging of the parasitic capacitance to reduce the current which inflows the parasitic capacitance

so as to reduce flicker noise;an inductance inserted on the source of transconductance to is form a negative feedback circuit and to improve the circuits linearity.Base on 0.18 mm CMOS process and 1.8V supply voltage

the post simulation results show that

the mixer has a good output characteristics in 250 M Hz intermediate frequency and a good circuit matching

the test gets a conversion gain of 22. 65dB

IIP3 of 7.66dBm

and SSB noise is 5.58dB in intermediate frequency 250M Hz.The power consumption of the circuit is 8.64mW.