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    • 7. 发明授权
    • Variable-gain image-reject low-noise amplifier
    • 可变增益图像抑制低噪声放大器
    • US07629850B2
    • 2009-12-08
    • US12127379
    • 2008-05-27
    • Brian Allan FloydScott Kevin Reynolds
    • Brian Allan FloydScott Kevin Reynolds
    • H03G3/30
    • H03F3/16G06F17/5063H03F3/72H03G1/0088
    • A variable-gain amplifier includes an intermediate node operative to receive an electric current from a current source. A common-emitter amplifier has a collector electrically connected to the intermediate node. A first common-base amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to an output node. A base-degenerated amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to the output node. A second common-base amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to small-signal ground. The intermediate node is operative to direct the electric current to the first common-base amplifier, thereby causing the variable-gain amplifier to operate in a first mode; and the intermediate node is operative to direct the electric current to the base-degenerated amplifier and the second common-base amplifier, thereby causing the variable-gain amplifier to operate in a second mode.
    • 可变增益放大器包括可从电流源接收电流的中间节点。 共发射极放大器具有与中间节点电连接的集电极。 第一公共基极放大器具有电连接到中间节点的发​​射极和电连接到输出节点的集电极。 基极退化放大器具有电连接到中间节点的发​​射极和电连接到输出节点的集电极。 第二公共基极放大器具有电连接到中间节点的发​​射极和电连接到小信号地的集电极。 中间节点可操作地将电流引导到第一共基放大器,从而使可变增益放大器以第一模式工作; 并且中间节点可操作地将电流引导到基极退化的放大器和第二公共基极放大器,从而使可变增益放大器在第二模式下操作。
    • 9. 发明申请
    • Variable-Gain Image-Reject Low-Noise Amplifier
    • 可变增益图像抑制低噪声放大器
    • US20090015335A1
    • 2009-01-15
    • US12127379
    • 2008-05-27
    • Brian Allan FloydScott Kevin Reynolds
    • Brian Allan FloydScott Kevin Reynolds
    • H03G3/00G06F17/50
    • H03F3/16G06F17/5063H03F3/72H03G1/0088
    • A variable-gain amplifier includes an intermediate node operative to receive an electric current from a current source. A common-emitter amplifier has a collector electrically connected to the intermediate node. A first common-base amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to an output node. A base-degenerated amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to the output node. A second common-base amplifier has an emitter electrically connected to the intermediate node and a collector electrically connected to small-signal ground. The intermediate node is operative to direct the electric current to the first common-base amplifier, thereby causing the variable-gain amplifier to operate in a first mode; and the intermediate node is operative to direct the electric current to the base-degenerated amplifier and the second common-base amplifier, thereby causing the variable-gain amplifier to operate in a second mode.
    • 可变增益放大器包括可从电流源接收电流的中间节点。 共发射极放大器具有与中间节点电连接的集电极。 第一公共基极放大器具有电连接到中间节点的发​​射极和电连接到输出节点的集电极。 基极退化放大器具有电连接到中间节点的发​​射极和电连接到输出节点的集电极。 第二公共基极放大器具有电连接到中间节点的发​​射极和电连接到小信号地的集电极。 中间节点可操作地将电流引导到第一共基放大器,从而使可变增益放大器以第一模式工作; 并且中间节点可操作地将电流引导到基极退化的放大器和第二公共基极放大器,从而使可变增益放大器在第二模式下操作。