公开(公告)号：US20030184386A1

公开(公告)日：2003-10-02

申请号：US10306212

申请日：2002-11-27

申请人： Texas Instruments Incorporated

发明人： Alan L. Varner ,  Ahmad Dashtestani ,  Joel M. Halbert ,  Michael A. Steffes

IPC分类号： H03F001/38

CPC分类号： H03F3/45112 ,  H03F3/45139 ,  H03F3/45174

摘要： A low power current feedback amplifier having a lower output impedance input stage is provided. To reduce the output impedance, an input stage comprises a closed-loop input buffer. An exemplary input buffer comprises a closed-loop current feedback amplifier configured within the overall current feedback amplifier, wherein the output of the input buffer corresponds to the inverting node of the overall current feedback amplifier. The closed-loop configuration of the input buffer is facilitated by the use of an internal feedback resistor coupled from an inverting input terminal of the input buffer to the output of the input buffer, which corresponds to the inverting input terminal of the overall current feedback amplifier. The closed-loop input buffer realizes a low output impedance since the loop gain reduces the output impedance of the input buffer. With a lower output impedance, the bandwidth of the current feedback amplifier becomes more independent of the gain, even at low current implementations. 1 Title:LOW POWER CURRENT FEEDBACK AMPLIFIER Inventor:Alan L. Varner Ahmad Dashtestani Joel M. Halbert Michael A. Steffes

摘要翻译： 提供具有较低输出阻抗输入级的低功率电流反馈放大器。 为了减小输出阻抗，输入级包括闭环输入缓冲器。 示例性输入缓冲器包括配置在总电流反馈放大器内的闭环电流反馈放大器，其中输入缓冲器的输出对应于整个电流反馈放大器的反相节点。 输入缓冲器的闭环配置通过使用从输入缓冲器的反相输入端耦合到输入缓冲器的输出的内部反馈电阻来实现，其对应于整个电流反馈放大器的反相输入端 。 闭环输入缓冲器实现了低输出阻抗，因为环路增益降低了输入缓冲器的输出阻抗。 具有较低的输出阻抗，即使在低电流实现下，电流反馈放大器的带宽变得更加独立于增益。