Research And Design Of CMOS Wideband Mixer

The vigorous development of wireless communication systems has made various radio frequency circuits pervasive in all aspects of life.Ultra-wideband technology has many advantages such as wide bandwidth,low power,and strong anti-interference ability.It is a promising new wireless communication technology.As the core module of the radio frequency transceiver system,the mixer has a very important frequency conversion function,and its performance directly determines the lower limit of the performance of the entire system.We have always hoped to obtain circuits with smaller size,lower power consumption and better performance.With the maturity of the CMOS process,the performance of the device is continuously improved,and the process cost is greatly reduced.Compared with the III-V process Market competitiveness.Therefore,it is of great significance to study high-performance CMOS wideband mixers.Based on this,this paper proposes a high-performance mixer for ultra-wideband down-conversion systems.The design of the mixer is based on the traditional Gilbert mixer.In order to achieve compromise and optimization of its various performance indicators,the structure of each level of the mixer has been improved.The transconductance stage of the mixer adopts the resistance negative feedback structure,which can realize the function of improving the linearity of the mixer with a small area.The switch stage adopts a dynamic current injection structure to eliminate the flicker noise at the output as much as possible without introducing additional noise to ensure a good noise figure of the circuit.The load stage adopts inductance peaking technology,which broadens the signal bandwidth through resonance with the capacitor.An impedance matching network is added to the input end of the core circuit of the ultra-wideband mixer and the local oscillator recovery circuit.Good matching can not only maximize the transmission power,but also reduce the noise figure.It can be more convenient and intuitive by using the Smith chart.Achieve matching.This article also designs a local oscillator recovery circuit to recover the attenuated local oscillator signal during transmission from off-chip to on-chip,so as to achieve the best mixing effect.The design in this paper adopts 0.13?m CMOS process,the circuit design is carried out by Cadence,the simulation is carried out with the Spectre tool,and finally the layout design is realized by the Virtuoso tool.Under 1.8V power supply voltage,the power consumption of the circuit is 20.46 m W,the working bandwidth is 1.4-14.3GHz,the output intermediate frequency is 1.5GHz,the conversion gain is greater than 5d B in the bandwidth,the maximum conversion gain can reach 5.8d B,and the noise figure is2.2-Less than 13 d B in 11 GHz,P1d B is greater than-6.012 d Bm,IIP3 is greater than3.865 d Bm.The above simulation results show that the various performance parameters of the mixer have reached the expected index requirements.