A Direct Sampling Receiver Frontend Circuit Design

• Main Authors: Kao, ChenKai, 高振凱
• Other Authors: Chu, Tashun
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/39615787843633871176

碩士 === 國立清華大學 === 電機工程學系 === 100 === When mosfet and integrated circuit began being developed, modern society has become increasingly developed ,and people rely on high-tech product much more than past. Following the increased demand for high-tech product ,process technology progress ,and the improvement of process technology also make every functional circuit can be achieved in the same chip which cannot be made in the same chip before ,and it’s SoC technique what we often heard. Thanks to SoC technique ,receiver and transmitter of radar even can be achieved in one chip ,so it fully reach the target of small size ,Thanks to the smaller size ,the application level of ICs can be wider .For examples ,in military ,the airplane’s radar system can be extended to more sophisticated array detection because of the narrowing of a single chip .In security system ,radar system can also be used to detect the movement of objects ,and in modern society the proportion of car population more than past ,people can use radar system to provide anti-collision function ,which has the opportunity to reduce traffic accidents .Moreover ,because of aging population in our world ,people can use radar system to provide home care and physical condition detection. In the receiver of radar system ,its main function is to amplify signal received from antenna and providing system good capability of noise rejection .Moreover ,it should reduce signal frequency in order to facilitate the operation of the backend circuit .In this thesis, the direct sampling receiver architecture is used ,in which the system contains a wideband LNA ,sample &; hold ,voltage buffer ,VGA ,and LNA is the first circuit after antenna ,it must amplify signal preliminary ,providing system good capability of noise rejection to ensure signal is not distorted .The amplified signal after reducing frequency by sample &; hold circuit will be referred to the baseband circuit in the backend of radar system to operate .The design of circuit in this time will be implemented to test and verify by TSMC 65nm process.