摘要
为了放大微弱的高频信号,需要使用LC谐振放大器。以三极管等分立元件构建的单调谐放大器,具有功耗小,噪声低等优点。三级谐振放大器级联实现较大的增益,级间通过高频变压器互感耦合,便于调整谐振频率,并减少损耗。经测试,本LC谐振放大器放大中心谐振频率15.1 MHz,偏差100 kHz,-3 dB带宽300 kHz,实现80 dB的放大倍数,功耗324 mW。输入50μV微弱信号时,输出无明显失真。结果表明,该LC谐振放大器具有低噪声、低功耗、高增益等优点。
This LC resonance transistor amplifier, is the construction of high frequency division components,using single tuned amplifier as the main body, 3 stages amplification achieve 80 dB amplification. Center the resonant frequency 15.1 MHz, deviation 100 kHz, -3 dB bandwidth 300 kHz, power consumption of 324 mW. In order to facilitate the measurements, add a fixed 40 dB attenuation device. Resonance amplifier 50 μV input, output no significant distortion. This system has low noise, low power consumption, high power gain, AGC, etc.
出处
《宁波职业技术学院学报》
2011年第5期21-23,27,共4页
Journal of Ningbo Polytechnic
关键词
LC调谐
三极管
高频
低噪声
高增益
低功耗
LC tuned
transistor
high frequency
low noise
high-gain
low power consumption
