Design and testing of a typical differential amplifier circuit

The design,simulation and testing of an amplifier with differential input and differential output are briefly described. Its operating principles and some problems in applications are discussed,and the corresponding measures are given. Design calculation of the differential filter is the key point of this paper. The differences between the differential amplifier and the single-ended amplifier are listed in the design and testing aspects. According to experience in practical work,this paper presents a simple case of testing of DC signal and AC signal,respectively.