Design Of Front-end CMOS Circuits Of DPS Receiver In Very Deep Sub-micrometer Scale

Nowadays, various kinds of quantum effects or tunnel effects have been taken into account based on the classical or quasi-classical MOSFET model when analyzing and simulating the working principles of MOSFETs. Therefore, the questions that how to model the sub-micrometer/nanometer MOSFETs accurately and extracting model parameters has been a important challenge.In-this thesis, the macro-model of very deep sub-micrometer MOSFET is established which can be employed in circuit designs. And then the function and structure of front-end radio frequency circuits of GPS receiver are investigated in conjunction with the analyses and corrections of its internal circuit.Firstly, an elementary outline to the GPS system is introduced which contains the development and research state of the front-end RF chips of GPS receiver. Then the macro model of VDSM MOSFET is set up.In the third chapter, the noise characteristics of the CMOS low-noise amplifier are analyzed theoretically and exhaustively. Furthermore, a low-noise amplifier circuit is designed by the noise optimization theory. During this design, the common-source stage inductance negative feedback structure i s adopted The input impedance of this structure make use of the inductor and capacitor which make 1575.42MHz of the GPS carrier wave as the resonance frequency point. The source side inductance of the first level MOSFET is used to input 50 Ω's match. Two levels of MOS.FETs can be optimized by noise performances and linearity characteristics respectively. The final gain of the amplifier is approximately 15dB under 3.3 V's supply voltage which is higher than the 13.5dB of the design requirements. Meanwhile, the noise factor is 4.5dB which is reduced by 0.9dB compared to design requirements. Power dissipation of this circuit is smaller than 15m W.During the fourth chapter, the mixer circuit of the front-end radio frequency chip is analyzed. Considering the power dissipation and the complex degree of the circuit structure, two times frequency conversion circuit structure is adopted. This...