Research And Design Of Low-power High-linearity RF Low-noise Amplifier And Mixer

With the development and improvement of the wireless communication technology,various wireless communication systems have been applied in our daily life,which makes our producing more efficient and makes our life better.The signal receiving is completed by the receiver of the wireless communication system,and the LNA and Mixer are important components in the receiver,so their performances significantly influence the receiver and even the whole wireless communication system.Compared with the increasing demand of high performance,the development of the battery technology is relatively lagging.Therefore,the design of low power and high performance LNA and Mixer will vitally promote the development of the wireless communication system.The LNA and Mixer connect the antenna to the backward stage,the RF signal is received by the antenna and amplified by the LNA,then is transformed by the Mixer into low frequency signal which will be processed by backward stages.This dissertation revolves around the mainline of designing low power high performance LNA and Mixer,and sufficiently analyzes the research status of LNA and Mixer with two entry points of low voltage low power and high linearity low noise.Guided by the theoretical analysis with simulation and test techniques,LNA and Mixer with practical application value are designed in this dissertation.The main innovations of this dissertation are:(1)A low power high gain UWB LNA(LPHG-LNA)is proposed.This LNA bases on simple cascode structure and utilizes forward-body-bias technique to reduce the power consumption.Besides,the multiple-feedback network,which is constructed by transformer and resistive feedback,is adopted in the common-gate stage to improve the impedance matching and to increase the operating bandwidth,the operating frequency ranges from 3.4GHz to 10.1GHz.This LNA achieves the gain of 14.2dB under a 0.8V supply voltage,while the NF reduces to 1.49 dB and the power consumption is 2.33 mW.(2)A low power high linearity UWB LNA(LPHL-LNA)is proposed.According to the non-ideal linearity issue of LPHG-LNA,this LNA uses a noise and distortion cancellation technique to optimize,the noise is constrained and the linearity is improved.Compared with LPHG-LNA,this LNA has comparable supply voltage,power and gain,but the operating frequency is increased from 3.4GHz-10.1GHz to 3.1GHz-10.6GHz.The noise of this LNA is well constrained even with four extra MOS transistor,while the IIP3 improves 19 dBm and achieves 4.2dBm.(3)To better cooperate with LNA and complete the mixing process,a low power high linearity high gain Mixer(HLHG-Mixer)is proposed.This Mixer adopts passive switching core to get lower power and less nonlinear distortion.The input signal in the Mixer is double amplified by the current reuse complementary amplifier in the transconductance stage and the common source amplifier in the load stage to get higher conversion gain.This Mixer achieves a conversion gain of 12.4dB under a supply voltage of 1V,and has a good linearity.The IIP3 and P1 dB are 7.78 dBm and-3.76 dBm with 1.41 mW power consumption.(4)A low power high linearity low noise Mixer based on subharmonic balun(HLLN-Mixer)is proposed and fabricated under standard 0.18?m RF CMOS process of GLOBAL FOUNDRIES.This Mixer utilizes a sub-harmonic balun to decreases the frequency,number and power of the LO signal,and then reduces the complexity of the local oscillator.In accordance to the non-ideal noise problem of HLHG-Mixer,this Mixer uses a noise and distortion cancellation technique in the transconductance stage to optimize,the noise is constrained and the linearity is maintained.Furthermore,the biasing currents of the transconductance stage and the switching stage are different,and current injection technique is adopted in this Mixer to enhance the biasing current of the transconductance stage for higher gain and lower noise.Compared with HLHG-Mixer,the noise of this Mixer is decreased from 15.66 dB to 2.6dB,while the conversion gain increases 3.4dB and achieves 15.8dB.The IIP3 is 6.6dBm and power consumption is about 7.6mW.Compared the FOM of these two Mixers,this Mixer has a FOM of 4.49 and HLHG-Mixer has a FOM of 0.53,which indicates that the HLLN-Mixer has a better overall performance.Compared with related works,the LNAs and Mixers proposed by this dissertation have some advantages and distinct characteristics.Therefore,the research and design work completed by this dissertation have positive promotion to the development of the wireless communication system.