Half current switch with feedback

Details Half current switch with feedback Half current switch with feedback

H - Electricity

03

K

323/4

H03K 17/16 (2006.01) H03K 19/00 (2006.01) H03K 19/082 (2006.01) H03K 19/086 (2006.01)

Patent

CA 1299240

Half Current Switch With Feedback Abstract of the Invention A half current switch comprising: at least one input transistor, a load resistance connected between a first voltage reference and the collector of the input transistor, a constant-current resistance connected between the emitter of the input transistor and a second voltage reference, and a feedback means including at least one feedback connected to the constant-current resistance. The feedback means further includes means for biasing the feedback transistor to drive a current through the constant current resistance which, when flowing, increases with an increasing main current and decreases with a decreasing main current through the input transistor. The feedback means thus causes a constant current to be drawn by the input transistor when it is conducting, thereby controlling the capacitance of the input transistor while maintaining the output level constant.

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