Research On Coupling And Key Block Of Multiple Channel Receiver Based On CMOS Technology

Over the decades, all kinds of technologies have emerged in wireless technology. Oneof the hottest topics is multiple channel technology which has greatly enhanced theperformances of wireless system. Typical multiple channel systems include Active PhasedArray system, MIMO (Multi-input Multi-output) system and Imaging Array system. All ofthese systems have superior performances compared to conventional single channelsystems. However, typical multiple channel systems have drawbacks such as costs, sizes,power dissipation, and conformities. To settle these, high integrated silicon technology iswidely used. But the coupling between channels which caused by using the same substrategreatly affects performances of multiple channel system. This paper concentrates on thecoupling and key blocks in multiple channel system, and this has a significance to researchof multiple channel system. This paper is organized as follows:Ⅰ. The research of how coupling between channels affects Imaging Array system isconducted, using passive focal plane array imaging system as an example. According totypical theories, models of passive focal plane array imaging are constructed. Andtheoretical derivation is given to show the influence of coupling in passive focal planearray imaging system.Ⅱ. Main kinds of coupling mechanisms and reasons of coupling are analyzed.According to the analyses, the models of coupling between LNAs (Low Noise Amplifier)brought by nearby inductors are established. Theoretical results are derived by using themodels. Further more, collaborative simulation of Cadence and Sonnet is accomplished togive simulation results. Based on these results, comparative analysis is given. A fourchannels receiver is designed with0.18μm RF CMOS technology by applying theseanalyses. And the comparison between theoretical results and measured results is given.Ⅲ. The structure of2GHz four channels receiver is proposed under the instruction oftheoretical analyses. The noise, input matching, and gain of LNA is analyzed. Consequently,design procedure of LNA is proposed. After that, Mixer topology and design procedure are explored. The simulation results and measurement results of LNA, Mixer and whole2GHzfour channels receiver are given.Ⅳ. In order to settle the conflicts between reference spur and settling time, a low spur,fast locking hybrid PLL is proposed based on conventional band switching technology. Thehybrid PLL works as typical single channel wide bandwidth PLL at transient state, and asdual-path narrow bandwidth PLL at steady state. To verify the theory analysis, a hybridPLL is fabricated with0.18μm RF CMOS technology. And the measurement results arelisted.