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    • 3. 发明申请
    • Variable Gain Amplifier
    • 可变增益放大器
    • US20090251218A1
    • 2009-10-08
    • US12062438
    • 2008-04-03
    • Paulo Oliveira
    • Paulo Oliveira
    • H03G3/00
    • H03G3/10
    • A variable gain amplifier for amplifying an amplifier input signal includes a current steering transconductance stage and an impedance transformation network configured to match the current steering transconductance stage to the amplifier output. The impedance transformation network includes a tapped inductor, wherein a first inductive portion of the tapped inductor is magnetically coupled with a second inductive portion of the tapped inductor. The current steering transconductance stage is configured to receive the amplifier input signal and to controllably provide a current signal to a node at the first end of the inductor or to a node electrically circuited between the amplifier output and the first end of the inductor, or to a first tap of the tapped inductor, or to a second tap of the tapped inductor.
    • 用于放大放大器输入信号的可变增益放大器包括电流导向跨导级和被配置为将当前导向跨导级与放大器输出相匹配的阻抗变换网络。 阻抗变换网络包括抽头电感器,其中抽头电感器的第一电感部分与抽头电感器的第二电感部分磁耦合。 当前的导向跨导级被配置为接收放大器输入信号并且可控制地将电流信号提供给电感器的第一端处的节点或者在放大器输出和电感器的第一端之间电耦合的节点,或者 抽头电感器的第一抽头,或抽头电感器的第二抽头。