公开(公告)号：US4843343A

公开(公告)日：1989-06-27

申请号：US140454

申请日：1988-01-04

申请人： Gary L. Pace

发明人： Gary L. Pace

IPC分类号： H03H11/12

CPC分类号： H03H11/1213

摘要： A current mode active filter includes a differential amplifier, having two transistors, and a current mirror, having two transistors, connected into a feedback loop. The phase shift of the loop is controlled by one or two grounded capacitors and bias current sources connected to forward bias the base-emitter junctions of the transistors. The frequency of the filter is controlled by varying the dynamic resistances of the base-emitter junctions with the bias current sources. The current mirror increases loop gain, thereby enhancing the Q of the circuit. Improved dynamic range and large-signal performance can be achieved by the addition of two transistors to the current mirror circuit.

摘要翻译： 电流模式有源滤波器包括具有两个晶体管的差分放大器和连接到反馈回路中的具有两个晶体管的电流镜。 环路的相移由一个或两个接地电容器控制，偏置电流源连接到正向偏置晶体管的基极 - 发射极结。 通过改变基极 - 发射极结与偏置电流源的动态电阻来控制滤波器的频率。 电流镜增加了环路增益，从而提高了电路的Q值。 通过向电流镜电路添加两个晶体管可以实现改进的动态范围和大信号性能。