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Precision current mirror and method for voltage to current conversion in low voltage applications
Precision current mirror and method for voltage to current conversion in low voltage applications
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机译:精密电流镜和低压应用中的电压至电流转换方法
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摘要
A voltage-to-current conversion circuit includes an error amplifier (12A) which amplifies a voltage difference between the drains of the first (6) and second (7) transistors of a first current mirror, wherein drain current of the first transistor is proportional to an input voltage (Vin). The output of the error amplifier is connected to the gates of the first and second transistors. A compensation capacitor is coupled between the gate and drain of the first transistor. The drain current of the second transistor flows through a cascode transistor (16) to an input of a second current mirror, an output transistor (31) of which provides a current (Ibias) which is proportional to the input voltage (Vin) as a bias current for the error amplifier, to provide stable operation.
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