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    • 2. 发明申请
    • Variable Gain Circuit
    • 可变增益电路
    • US20100315166A1
    • 2010-12-16
    • US12797121
    • 2010-06-09
    • Takehito KAMIMURANorio Chujo
    • Takehito KAMIMURANorio Chujo
    • H03G3/10
    • H03G1/0088H03F3/72H03F2203/7206H03G1/0029H03G3/3084
    • There is provided a variable gain circuit system which is inductorless and capable of achieving a high gain and a wide band by elements for achieving variable gain to prevent decreasing a gain or deteriorating the band. The variable gain circuit includes: transistors; a resistor connected as a load of each transistor; a voltage source applying a bias voltage to each gate of the transistors; a switch selectively connecting the voltage source or a ground potential to each gate of the transistors in accordance with gain setting; and a current source connected to a common input. A drain of each transistor is connected to an input of a circuit in a subsequent stage.
    • 提供了一种可变增益电路系统,其是无电感的并且能够通过用于实现可变增益的元件实现高增益和宽带,以防止降低增益或使频带恶化。 可变增益电路包括:晶体管; 作为每个晶体管的负载连接的电阻器; 对晶体管的每个栅极施加偏置电压的电压源; 开关根据增益设置选择性地将电压源或接地电位连接到晶体管的每个栅极; 以及连接到公共输入的电流源。 每个晶体管的漏极在后续阶段连接到电路的输入端。
    • 5. 发明授权
    • Variable gain circuit
    • 可变增益电路
    • US08067984B2
    • 2011-11-29
    • US12797121
    • 2010-06-09
    • Takehito KamimuraNorio Chujo
    • Takehito KamimuraNorio Chujo
    • H03G3/10
    • H03G1/0088H03F3/72H03F2203/7206H03G1/0029H03G3/3084
    • There is provided a variable gain circuit system which is inductorless and capable of achieving a high gain and a wide band by elements for achieving variable gain to prevent decreasing a gain or deteriorating the band. The variable gain circuit includes: transistors; a resistor connected as a load of each transistor; a voltage source applying a bias voltage to each gate of the transistors; a switch selectively connecting the voltage source or a ground potential to each gate of the transistors in accordance with gain setting; and a current source connected to a common input. A drain of each transistor is connected to an input of a circuit in a subsequent stage.
    • 提供了一种可变增益电路系统,其是无电感的并且能够通过用于实现可变增益的元件实现高增益和宽带,以防止降低增益或使频带恶化。 可变增益电路包括:晶体管; 作为每个晶体管的负载连接的电阻器; 对晶体管的每个栅极施加偏置电压的电压源; 开关根据增益设置选择性地将电压源或接地电位连接到晶体管的每个栅极; 以及连接到公共输入的电流源。 每个晶体管的漏极在后续阶段连接到电路的输入端。