Implementation of LTE RF receiver systems

• Main Authors: Sheng-Wen Yu, 余聖文
• Other Authors: Kuang-Hao Lin
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/39204177357185317374

碩士 === 國立勤益科技大學 === 電子工程系 === 102 === The trend in wireless technology prevails globally, and new technologies are developed and advanced rapidly. Wireless communication systems have evolved from the use of analog signals to digital signals, and fixed equipment has been developed into portable equipment for users. Thus, people are benefiting from achievements in the surge of wireless equipment development. Smart phones and tablet computers have promoted the use of mobile Internet. According to the development of the global mobile communications market, this study was divided into two sections. In the first section, the evolution of 1G to 4G wireless communications was sequentially examined. Numerous industry analyses and data comparisons were used to explore the 4G wireless communications market and industry structure both domestically (in Taiwan) and globally. Because long-term evolution (LTE) is a mainstream standard of 4G wireless communications, in the second section, radio frequency (RF) front-end circuits that can be applied in LTE systems were proposed. The direct-conversion receiver framework was employed. LT5500 chips developed by Linear Technology were selected for this study. Regarding the circuit design and layout, electromagnetic compatibility (EMC) analysis was conducted. Under 1.35 V operating voltage, the frequency bands of the circuit were recorded as 1.5 G and 2.5 G. The S parameters for the high and low gain modes of low-noise amplifiers (LNAs) and for frequency mixers at 2.5 G RF and 2.22 G local oscillator (LO) frequency bands with 280 MHz intermediate frequency (IF) output were also recorded.