文档介绍：------------------------------------------------------------------------------------------------ ——————————————————————————————————————宽带之路放大器- 论文 NEC 电子杯 2009 年全国大学生电子设计竞赛宽带直流放大器( C 题) 【本科组】参赛人员: 张洪青(队长) 李金印李晨铭 09年C题【宽带直流放大器】摘要: 本系统以自制直流稳压电源为主要供电方式, 603 运放为主放大芯片,通过改变滑动变阻器替代单片机加DA 数模转换方式来达到手动连续可调的目的。通过选择 603 的特定的工作模式来确定增益范围, 完美达到要求的 Av>40dB 的要求, 其高阻抗的特点使其在输入电压有效值较小的情况下( Vi<20mV ) 仍能得到较好的输出波形, 且当信号被放大到 2V 以上时,输出波形良好,具有较高的保真效果。电源部分采用了先进 NEC 公司的稳压管 UPC78L05J ,确保了电源的稳定性。使用了多种抗干扰措施以减少噪声并抑制高频自激。------------------------------------------------------------------------------------------------ ——————————————————————————————————————关键词:压控;增益可调;宽带;直流放大; Abstract: This system take the self-made cocurrent voltage-stabilized source as the main power supply way, 603 transports puts primarily enlarges the chip, adds the DA digital-analog conversion way through the change glide rheostat substitution monolithic integrated circuit to achieve the manual continuously adjustable chose 603 specific working patterns to determine the gain scope, achieved perfectly the request the Av> 40dB request, its high impedance characteristic enabled it (Vi 20mV) still to obtain the good< output wave shape in the input voltage effective value small situation, also when the signal is enlarged to 2V above, the output wave shape was good, has the high fidelity power unit has used ad