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发明公开
CN108075739A 可变增益放大器 有权

可变增益放大器
摘要：
本发明提供了一种可变增益放大器，包括第一输入晶体管、第一辅助晶体管、第一有源电感器和输入电流复制电路。第一输入晶体管用于接收第一输入信号，以在第一输出端上产生第一输出信号。第一辅助晶体管耦接于第一输出端，其中，第一输出端的电流流入第一输入晶体管和第一辅助晶体管。第一有源电感器耦接于第一输出端。输入电流复制电路耦接于第一输出端，其中，第一有源电感器和输入电流复制电路用于分别产生电流至第一输出端，以及，输入电流复制电路产生至第一输出端的电流与第一输入晶体管的电流相等。采用本发明，可以同时实现宽增益范围和宽带宽。
摘要（英）：

The invention provides a variable gain amplifier which includes a first input transistor, a first auxiliary transistor, a first active inductor and an input current replica circuit. The first input transistor is arranged for receiving a first input signal to generate a first output signal at a first output terminal. The first auxiliary transistor is coupled to the first output terminal, wherein acurrent of the first output terminal flows into the first input transistor and the first auxiliary transistor. The first active inductor is coupled to the first output terminal. The input current replica circuit is coupled to the first output terminal, the first active inductor and the input current replica circuit are used for respectively generating currents which flow to the first output terminal, and a current flowing to first output terminal from the input current replica circuit is equal to the current flowing to the first input transistor. Via the variable gain amplifier, a wide gain range and high bandwidth can be realized at the same time.

公开/授权文献
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