Davood Jowkar - Young Researchers and Elite Club, Dariun Branch, Islamic Azad University, Dariun, Iran-
Mohammad Reza Bahmani - Young Researchers and Elite Club, Shiraz Branch, Islamic Azad University, Shiraz, Iran
Mohammad Bagher Jowkar - Young Researchers and Elite Club, Dariun Branch, Islamic Azad University, Dariun, Iran-
Ali Shourvarzi - Department of Electrical Engineering, Ferdowsi University of Mashhad ,Iran

Some of the applications of submarine communication are collecting the oceanography data, marine contaminations control, marine studies, military systems like relations between submarines and ships, and identification of submarine targets and torpedo. The principle of operation in submarine communication is based on sound acoustic emission which is utilized in a military sonar system in this paper. AGC is one of the most important parts of a sonar receiver.In this paper, designation of a circuit (based on a new topology) high quality separate automatic gain control (AGC) in a sonar receiver system is proposed and the results are compared with the previously designed circuits for RF and acoustic systems. The most important use of this circuit is in military industry, submarine communication, and ships.

AGC , Submarine Communication , Acoustic Emission