.2.6 Ghztdd-lte Receiver Design And Realization

21st century is the informationization age, in which plenty of information is disseminated by wireless way. Under this circumstance, wireless communication system must keep up with the social development. From the first generation communication system (1G) occurred in U.S.A in 1983 to the second generation communication (2G) represented by GSM appeared, then to the third generation communication (3G) represented by TD-SCDMA evolved, wireless communication system is keeping developing and innovating. Till now on, the appearance of the fourth generation communication system (4G) which is called TDD-LTE is the other milestone in the development of the wireless communication system. The high spectral efficiency, excellent code channel rate and the good anti-multipath ability make it be vigorously promoted by many operators.In the first, the paper briefly introduces the general theory of the radio frequency (RF) receiver in system and each part. Then a TDD-LTE receiver is designed and finished based on the requirements of the《3GPP TS 36.133》. The operation band of the receiver designed in this paper is from 2.58GHz to 2.6GHz and the bandwidth of the receiver is 20MHz which support the single carrier communication.During the design, the system target is firstly considered, mainly including noise figure, output IMD3, dynamic range and so on. Then analyzing and choosing the structure of the receiver and the target of each part is based on the system target in order to ensure it satisfy the system requirements. Use PIN diode to achieve the RF switch considering the high power and high frequency; Use two stage amplifiers to design the low noise amplifier in order to ensure the low noise figure and enough gain; Use high-low impendence microstrip to design the low pass anti-mirror filter considering the parasitic of the lumped LC. In order to improve the purity of the signal after downconversion, IF SAW filter is needed because of the high outband suppression. ADS is used to simulate the key parts and then successfully design and finish the radio frequency high power switch, low noise amplifier, RF pre-amplifier, anti-mirror low pass filter, mixer, IF SAW filter and automatic gain control circuit. After debugging and testing, the results satisfy the system requirements.