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@ keith1200rs
According to the book "Microelectronic circuit" by Adel S. Sedra and Kenneth C. Smith, a constant current source can be constructed using a current mirror. Basically a current mirror is a current source. All I am trying to say is if a transistor can be biased using a constant...
No i m not making a wilson current mirror. I am just trying to bias Q3 transistor using a normal current mirror. I am trying to use current mirror as a constant current source at the emitter junction of Q3, to bias the transistor Q3.
As you can see in this image, I have just replaced current...
This is the problem actually.. there should be a current in the base of Q3 and the voltage at base should be positive! If we just remove the current mirror and place a constant current source there at the emitter of Q3, then it works fine. It should also work fine with current mirror!
Hi,
I have made this current mirror circuit in proteus isis 7.10.
https://www.dropbox.com/s/qtlb0saaqmd9wr5/Cmirror.png
As Q1 and Q2 form a current mirror, the current AMM1 = 1A therefore AMM2 should also be 1A! but AMM2 here is 0A, so does AMM3. Can anyone tell what is wrong in this circuit...
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