Large Dynamic Range Of Analog And Digital If Receiver

Wireless communication receiver applies widely in so many areas such as wireless communication, television, broadcast, radar, satellite communications and so on. Along with the development of the technology of the wireless communication particular the modern modulation and software radio technique, meantime the employ of wireless frequency are more presser, the development of the receiver tend towards high performance and high integration. Modern receiver is in pursuit of big dynamic range, good linearity, and high sensitive and so on. That extremely promotes the development of the receiver. Also the requirement of receiver becomes more rigorous. As the name implies, receiver need to improve the linearity, to reduce the distortions rate and bit error rate, and to expend the dynamic range, of course should ensure the signal detect capability precondition.This paper base as up, study and realize the big dynamic range analog and digital receiver. This paper has main two tasks as below:(a) Study and analysis the theory and the index of the big dynamic range IF receiver. Design the blue print.(b) Demonstrate the blue print, draw the schematic, simulate and realize the IF receiver showpiece.In the blue print of the analog, author utilize the big dynamic VGA to realize the IF amplifier and use the audion to carry out the 80dB AGC, through the improvement of the traditional detect circuit, extend the dynamic range of the detector.In the blue print of the digital, make sure of the logarithmic Amplifier, A/D/A converter and FPGA realize the IF amplifier, big dynamic range AGC, detect and video process same as that in the blue print of the analog.