Research And Design Of UWB LNBA And Mixer

UWB (Ultra-Wide Band, UWB) technology is the current wirelesscommunication technology，a new type of extremely rapid development of wirelesscommunications technology. Ultra-wideband technology for its high-speed, highcapacity, low power and low cost features, is being paid academic and industryattention. Without doubt, UWB will be used more and more widely. So studying andimproving the performance of ultra-wideband RF circuits is very important to thedevelopment of wireless communication.This paper takes low noise amplifier and Mixer as research subjects, which arethe key modules in the UWB RF receiver front-end. A new low-voltage variable gainUWB LNA and a new ultra low voltage UWB mixer is proposed, based on thesystematic analysis of the technological study situation at home and abroad of theLNA and Mixer. The main achievements of this work consist of following aspects:First, a UWB3.1-to10.6-GHz low-voltage variable gain LNA is present in thispaper, which is based on the research of the UWB LNA. A common-gate stage forwideband input matching is employed. A modified cascade stages, which can work atlower voltages, is used to offers suitable gain. A gain control mechanism is alsointroduced in the proposed design by varying the biasing voltage of the gain stagewithout influencing the other figures of merit of the circuit. By employing the LCpeaking, flat gain is achieved over the7500-MHz UWB spectrum. Simulation resultsshow that the proposed UWB LNA achieves power gain with a good input and outputmatch (S11<-8.3dB, S22<-8dB), maximum power gain of16.27dB and11~16.27dBmodulated, minimum noise figure of2.44dB, while consuming17mW from the0.85V power supply.A UWB3.1-to10.6-GHz Ultra Low Voltage mixer based on traditional Gilbertmixer is proposed. By employing multiple-input-branch technique, folded topologyand a CS output stage, the mixer achieved good performance. It exhibits a conversiongain of13-18dB. SSB noise-figure (NF) less than15.7dBm, and IIP3and1dB CPbetter than0dBm and-12dBm respectively. The circuit consumes only6.6mW fromthe DC power supply of0.6V.The LNA and mixer is designed in a TMSC0.18μm RF CMOS technology. ADSis employed to accomplish the simulation, Virtuoso Layout Editor to finish the layout design. Through the proposed ultra-wideband low-noise amplifier and mixer circuitperformance comparison, the proposed amplifier circuit operating voltage, power,gain and so, has certain advantages, and the proposed new structure mixer at workvoltage, power, gain and linearity performance is better.