Microwave Broadband Agc Technology Research

With the fast development of information times, our life has been changed greatly. At the same time, the EM environment has been become complicated increasingly. At the such-and-such EM complicated environment, it's a big problem which's got more and more attention that insuring the communication, radar, EW systems well operation. Received and transmitted power level is a very important influencing factor which is always the bottleneck of a system. So our demand for power controlling is more and more rigorous. In addition, bandwidth is also an important factor in electronic systems, such as in the EW system, wide band power controlling is more essential. This paper is based on such background, and introduces a dynamic range compress technology for receiver, automatic gain control (AGC). Along with this base, it gives the design method of a wide band AGC circuit.This paper is divided two parts. The first part mainly introduces the AGC system research (chapter 1～chapter 3). The second part detailedly introduces a wide band AGC circuit's design and experiment (chapter 4～chapter 6).The first part introduces the structure and working characteristic of AGC, and makes a comparison with AGC, logarithmic amplifier and limited amplifier.The second part describes a real AGC circuit's design. The design of some important components in the AGC is included, specially using two methods to design a wideband low noise amplifier. Otherwise it introduces the method of design a 30dB dynamic range compress AGC circuit. Then combining ADS software, it gives the 60dB AGC circuit's simulation and design.Detailed system analyses and comprehensive simulation are the important guarantees for this task. Finally, the AGC circuit's performances are as follows. BW: 800~4000MHz, over 52dB dynamic range compress, noise figure: <4.1dB. And this design gives attention to miniaturization.