The Design of Variable Gain Wideband Amplifier

In order to effectively solve the control problem and to make people remotely transmit multimedia information quickly and accurately. This paper has proposed a design method of adjustable gain wideband amplifier. The method mainly adopts the reasonable cascade connection and impedance matching, and comprehensively improves the gain bandwidth and the output amplitude of voltage, using a variety of measures to reduce noise interference and to restrain the self-excited of high frequency. After the class adopt capacitive coupling, interference is reduced and the system dynamic acceptable range is improved. In the realization of the system noise index does not worsen the situation, can achieve the performance index of the adjustable gain range. Proved by the experiment, the method of this system is reasonable and controllable in practice.