摘要
介绍了程控增益低噪声宽带直流放大器的设计原理及流程。采用低噪声增益可程控集成运算放大器AD603和高频三极管2N2219和2N2905等器件设计了程控增益低噪声宽带直流放大器,实现了输入电压有效值小于10mV,输出信号有效值最大可达10V,通频带为0～8MHz,增益可在0～50dB之间5dB的步进进行控制,最高增益达到53dB,且宽带内增益起伏远小于1dB的两级宽带直流低噪声放大器的设计。
The design philosophy and flow of low noise programmable gain wide-band DC amplifier are presented. The fabricated low noise amplifier was cascaded with low noise integrated programmable gain op-amp AD603 and high-frequency transistor 2N2219 and 2N2905 and other devices. The input voltage is less than 10 mV, the output signal is 10 V, pass band is 0-8 MHz, the maximum gain is 53 dB, and the gain in 0-50 dB, 5 dB step can be controlled by the microcontroller. In addition, fluctuation in gain and bandwidth is less than 1dB of the two level wide-band low-noise DC amplifier.
出处
《现代电子技术》
2012年第3期188-190,共3页
Modern Electronics Technique
基金
南京邮电大学青蓝计划(NY210036)资助项目
教改项目(JG003311JX26)资助
关键词
低噪声
程控增益
功率放大
宽带直流放大器
low noise
programmable gain
power amplifier
wide-band DC amplifier
