Broadband amplifier used in telecommunications, broadcasting, radar, television, automatic control and other devices, has develop rapidly, and their increasingly requirements lie not only on output stability, and wide bandwidth, but also the best gain control. This article puts forward the design and realization of the circuit.
This paper introduces a variable gain broadband amplifier using AD603, which can simultaneously achieve wide bandwidth and high gain requirements. AT89S51 MCU as the core to achieve wide bandwidth and high gain to control the analog amplification becomes reality. After completing the design of the circuit, the paper verifies the correctness of the design though some simulations such as Proteus for MCU module and Multisim for amplification module. The paper also introduces the hardware design using general boards and the schematic and PCB design using Protel 99 SE.
