首页>
外国专利>
Impedance matched variable gain low noise amplifier using shunt feed-back
Impedance matched variable gain low noise amplifier using shunt feed-back
展开▼
机译:使用并联反馈的阻抗匹配可变增益低噪声放大器
展开▼
页面导航
摘要
著录项
相似文献
摘要
The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eliminating the feedback mechanism. This ensures that the input impedance seen at the input port does not grow excessively, using part of the feedback resistor as a passive termination at low gain levels. In this way variable gain ranges in excess of 30 dB can be achieved.
展开▼