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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I am confused with the idea of a current sink/current mirror circuit. Why not just have the current sink to ground? Can anyone explain this to me? Thanks.
A current sink is not a circuit, it is a circuit function. For example an NPN transistor with the emitter connected to ground will sink current to ground when turned on.
A current mirror normally consists of two transistors configured such that a current through one transistor is mirrored in the collector of the other as a constant current. It's typically used in various bias circuits such as biasing the internal stages of an operation amplifier. (See https://en.wikipedia.org/wiki/Current_mirror for more info).
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