, , . ‑ , , r (. , 2). , r .
. , R = dU / dI, I = I, R ~= r ‑ [ r = 25/ I ()]. , . 2.34, r = 25 , I = 1 . ( R, , R , r). . 2.34, R ( . 2.34, ).
. 2.34.
r R /(h21 + 1) ( R, ). , R = 1 I = 1 , R = 35 (, h21 = 100). , r , ( , , ). , ‑ r .
‑ , r . , r R: GU = U / U; R /(r + R). , , , , 1 , 1 , 0,976.
, (. . 3.07); ( bm = 1/ r) GU = Rbm /(1 + Rbm).