Strangely, regardless of Q3, there was a 33% loss in the current mirror. This was probably because of the low current level I was mirroring. High beta values lead to higher error as well.
Tuesday, April 26, 2011
Back to Basics
After briefly reading my textbook, I decided to build a current mirror using random BJTs that were lying around. Q3 is there to reduce the base-current error. Since I don't have a desktop current source I decided to use a biased PNP transistor. This was a great opportunity for me to try the simulation capabilities of LTSpice. As you can see below, the LTSpice simulation closely matched the actual data.
Strangely, regardless of Q3, there was a 33% loss in the current mirror. This was probably because of the low current level I was mirroring. High beta values lead to higher error as well.
Strangely, regardless of Q3, there was a 33% loss in the current mirror. This was probably because of the low current level I was mirroring. High beta values lead to higher error as well.
