Widlar current source

A Widlar current source is like a magic tap that always lets out the same amount of water, no matter what. But instead of water, it lets out a controlled amount of electricity. It's like when you turn on a faucet and the water pressure changes depending on how much you open it. But with a Widlar current source, the amount of electricity that comes out stays the same, even if other things in the circuit change.

This is really useful in circuits because sometimes you want to make sure that a certain part of the circuit always gets a certain amount of electricity, no matter what. Think of it like baking a cake. You need to make sure you put in the right amount of each ingredient, or else it won't come out right. With a Widlar current source, you know for sure that the right amount of electricity is going to the right part of the circuit, just like how you know you're putting in the right amount of sugar or flour for your cake.

In summary, a Widlar current source is a special part of a circuit that makes sure a certain amount of electricity always goes to a certain part of the circuit, no matter what else is happening in the circuit. It's like a magic tap that doesn't change the amount of electricity it lets out, no matter what.