公开(公告)号：US20090140808A1

公开(公告)日：2009-06-04

申请号：US11947085

申请日：2007-11-29

申请人： Chit Ah MAK ,  Chun Fai WONG ,  Lap Chi LEUNG ,  Xiaofei KUANG ,  Jennifer Shuet Yan HO ,  David Kwok Kuen KWONG

发明人： Chit Ah MAK ,  Chun Fai WONG ,  Lap Chi LEUNG ,  Xiaofei KUANG ,  Jennifer Shuet Yan HO ,  David Kwok Kuen KWONG

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F1/3211 ,  H03F1/486 ,  H03F1/56 ,  H03F3/45192 ,  H03F2200/36 ,  H03F2200/513 ,  H03F2203/45138 ,  H03F2203/45356 ,  H03G1/0023 ,  H03G7/004 ,  H03G7/06

摘要： A gain control circuit including a resistor with a first terminal and a second terminal; an operational amplifier with an inverting terminal thereof electrically coupled to said first terminal of said resistor; a non-inverting terminal thereof; and an output terminal thereof; an amplifier circuit for transforming the voltage change of said operational amplifier output into a substantially exponential current change; wherein the output of said amplifier circuit is electrically coupled to said inverting terminal of said operational amplifier. The above described gain control circuit is able to perform wide bandwidth input signal buffering with linearity under low voltage and low power conditions. The circuit also offers low output impedances without the need of additional buffers and hence minimizing circuit size and manufacturing costs.

摘要翻译： 一种增益控制电路，包括具有第一端子和第二端子的电阻器; 运算放大器，其反相端电耦合到所述电阻器的所述第一端子; 其非反相端子; 及其输出端子; 放大器电路，用于将所述运算放大器输出的电压变化变换成基本指数的电流变化; 其中所述放大器电路的输出电耦合到所述运算放大器的所述反相端。 上述增益控制电路能够在低电压和低功率条件下以线性方式执行宽带宽输入信号缓冲。 该电路还提供低输出阻抗，而不需要额外的缓冲器，因此最小化电路尺寸和制造成本。

公开(公告)号：US07659780B2

公开(公告)日：2010-02-09

申请号：US11947085

申请日：2007-11-29

申请人： Chit Ah Mak ,  Chun Fai Wong ,  Lap Chi Leung ,  Xiaofei Kuang ,  Jennifer Shuet Yan Ho ,  David Kwok Kuen Kwong

发明人： Chit Ah Mak ,  Chun Fai Wong ,  Lap Chi Leung ,  Xiaofei Kuang ,  Jennifer Shuet Yan Ho ,  David Kwok Kuen Kwong

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F1/3211 ,  H03F1/486 ,  H03F1/56 ,  H03F3/45192 ,  H03F2200/36 ,  H03F2200/513 ,  H03F2203/45138 ,  H03F2203/45356 ,  H03G1/0023 ,  H03G7/004 ,  H03G7/06

摘要： A gain control circuit including a resistor with a first terminal and a second terminal; an operational amplifier with an inverting terminal thereof electrically coupled to said first terminal of said resistor; a non-inverting terminal thereof; and an output terminal thereof; an amplifier circuit for transforming the voltage change of said operational amplifier output into a substantially exponential current change; wherein the output of said amplifier circuit is electrically coupled to said inverting terminal of said operational amplifier. The above described gain control circuit is able to perform wide bandwidth input signal buffering with linearity under low voltage and low power conditions. The circuit also offers low output impedances without the need of additional buffers and hence minimizing circuit size and manufacturing costs.

摘要翻译： 一种增益控制电路，包括具有第一端子和第二端子的电阻器; 运算放大器，其反相端电耦合到所述电阻器的所述第一端子; 其非反相端子; 及其输出端子; 放大器电路，用于将所述运算放大器输出的电压变化变换成基本指数的电流变化; 其中所述放大器电路的输出电耦合到所述运算放大器的所述反相端。 上述增益控制电路能够在低电压和低功率条件下以线性度执行宽带宽输入信号缓冲。 该电路还提供低输出阻抗，而不需要额外的缓冲器，因此最小化电路尺寸和制造成本。