Research And Design Of Wideband CMOS LNA And Mixer

With the speedy increase of wireless applications and relative communicationstandards, and the demand for high date rate wireless communication, the wideband LNAand mixer have gained increasing research interests in the recent years. A0.4~0.6GHzLNA and a3~6GHz mixer are designed in this work.The two most important problems, noise mechanism and non-linear distortionmechanism, are studied firstly. Then some major property parameters of wideband LNAand main input match technologies are analyzed. To realize the wideband LNA designmentioned here, new noise cancellation technique is proposed utilizing common sourceparallel connection based on the common gate match. Meanwhile the detailed designconsideration on balun, noise figure optimization, input match bandwidth, outputbandwidth and Gain flatness is illustrated. The designed LNA is simulated based on theTSMC0.18um RF CMOS fabrication process. Within400MHz~6GHz frequency band, thereflection coefficient of LNA is less than-13dB, the noise figure is2.7~3.5dB, the gain is17~17.7dB and ripper is less than0.7dB. The IIP3and P1dBat3GHz are3.8dBm and-8.6dm, separately. The power consumption is11.4mWfrom a1.8V supply voltage..Lastly the main parameters of down-conversion mixer and several classic mixertopologies are studied. New mixer design is realized based on folded structure and animprovement of typical Gilbert cell. The detailed consideration on DC bias and linearity oftransconductance stage and switch stage is further illustrated. The simulation resultsindicate that, within3~6GHz, the conversion gain and the noise figure of the mixer are10.6~11.8dB and15.7~16.9dB separately. The IIP3and P1dBat4.5GHz are5dBm and-5.8dBm separately. The power consumption is5.6mWfrom a1.8V supply voltage.