Design Of Mixer And Programmable Gain Amplifier For GPS Receiver

Global satellite navigation system applications have been developing towards low-power dissipation, high level integration and more intelligent as the technology advances. It has becoming a global high-tech industry. Radio frequency (RF) front-end integrated circuit is a critical component of the whole wireless communication system. However, in China, RFIC design is getting started now, breaking the bottleneck of RFIC design is key to accomplishment of the chain industrialization.In this thesis, a mixer and a intermediate frequency programmable gain amplifier (IF PGA) for GPS/Galileo dual-mode receiver are studied. The mixer is a key block in the signal chain. The main function of the mixer is to convert the frequency of input signal to the baseband or the IF. Since this is a time-variant non-linear process, it will impact the performance of the whole system a lot. The PGA embedded right after the mixer, is also an essential component of the receiver. As the interface between RF and IF band, it processes the IF signal down-converted by the mixer, it offers enough gain to suppress the noise of succeeding blocks, wide gain control range and high linearity. The overall PGA gain varies from 16dB to 34dB with 6dB per step.The basic knowledge of navigation communication system and receiver structures are studied first in this thesis. Then GPS/Galileo system and frequency spectrum are introduced. Based on these works, analysis and design of mixer and PGA are thoroughly studied. Finally we show all the simulation results with the SMIC 0.18CMOS mixed-signal technology.