Design Of 0.2?2.5GHz Rf Front-end Circuits Of Wideband Receiver

In recent years,with the growing demand for wireless products,broadband communication system which can cover a variety of wireless communication frequency bands has become the focus of current research.As the key module of the wireless communication system,the receiver RF front-end circuit must also meet the needs of broadband.The performance of the RF front-end circuit will directly affect the overall performance of the entire receiver.Therefore,the research of the broadband front-end circuit of the broadband receiver has broad applications prospect.Based on the 40 nm CMOS process,this paper designs a broadband receiver RF front-end circuit with an operating frequency of 0.2?2.5GHz,which is mainly composed of a low noise amplifier(LNA)and a mixer(Mixer).The RF front-end circuit of the receiver in this paper adopts a low-IF structure,which can effectively solve the problem of DC deviation,and has low flicker noise.By using IQ two-way orthogonal structure,image interference can be eliminated.The LNA uses a common-gate structure to achieve broadband input matching,and reduces noise through the equivalent transconductance enhancement technology and noise cancellation technology of capacitive cross-coupling.The passive mixer structure is adopted to improve the linearity,and the switch tube of the passive mixer has no DC current,which can effectively reduce 1/f noise corner frequency.A transconductance stage is added in front of the passive mixer.The transconductance stage uses current multiplexing technology to reduce power consumption and uses self-bias technology to eliminate the bias circuit.Two transconductance units are used in parallel,and the number of transconductance units that are controlled by switches is used to provide two different transconductance values.A transimpedance stage is added after the passive mixer to convert the current signal into a voltage signal.Multiple switching resistors are used in the transimpedance stage.By controlling the number of switches,a variety of different transimpedance values can be provided,which can be combined with the two transconductance values to achieve the adjustable gain function.This paper gives the design process,pre-simulation results and post-simulation results of the wideband receiver RF front-end circuit.The post-simulation results show that: at the TT process angle,0.9V power supply voltage,within 0.2 ? 2.5GHz operating frequency,the input match is less than-10 d B,the noise figure is less than 5.2d B,the 1 / f noise corner frequency is less than 100 k Hz,and the maximum gain is greater than 36 d B,The minimum gain is less than 3d B,the output 1d B compression point is greater than-4d Bm,and the quiescent current is less than 5m A.In this paper,the wideband receiver RF front-end circuit has extremely low power consumption,low noise,flexible gain,and good linearity in the working frequency range of 0.2 ? 2.5GHz.After tape-out verification,it can be used in the broadband transceiver system chip.