| 摘要 |
<p>A non-linear current mirror is achieved. The non-linear current mirror is particularly useful in the output stage of an operational transconductance amplifier for improving slew rate and stability while maintaining low bias current. The non-linear current mirror circuit comprises, first, a first MOS transistor having gate, drain, and source. The gate and drain are coupled together and further coupled to a first current input. A second MOS transistor has gate, drain, and source. The gate is coupled to the first MOS transistor gate, and the drain is coupled to a second current input. A third MOS transistor has gate, drain, and source. The drain is coupled to the second MOS transistor source, and the gate is coupled to the second MOS transistor drain. A fourth MOS transistor has gate, drain, and source. The gate is coupled to the third MOS transistor gate. The source is coupled to the first MOS transistor source and the third MOS transistor source. Finally, the drain forms a current output. The current output value linearly tracks the second current input value over a first range of relative values between the first and second current inputs. The current output is a non-linear, large value over a second range of relative values between the first and second current inputs. <IMAGE></p> |
