How does using a current mirror as a load for a LTP double the gm of the stage?
Lets say the LTP has a 2mA tail current source. I can see how the mirror would balance the two halves during quiescent conditions, but I've read that the mirror will double the transconductance of the stage. How? In Bob Cordell's book he talks about how in the simpler resistance loaded LTP, the gain of the inverting half is being thrown away, but anyway I think about it, the two sides are still juggling the same 2 mA back and forth.
Any thoughts?
Lets say the LTP has a 2mA tail current source. I can see how the mirror would balance the two halves during quiescent conditions, but I've read that the mirror will double the transconductance of the stage. How? In Bob Cordell's book he talks about how in the simpler resistance loaded LTP, the gain of the inverting half is being thrown away, but anyway I think about it, the two sides are still juggling the same 2 mA back and forth.
Any thoughts?