2)增益 ①A、丶 A *可以相互转换 r R i R R . iR R A R. R
2）增益 ① i i i i o i o g i L i i i o L i o v i i i o o L i o r i o g i o i i o v R A i R i v i A R R A i R i R v v A v i R v i R i v A v i A i i A v v A = = = = − − = = = = − = = = = * 可以相互转换
R Rr,=0 2=A,(R->∞ R R L + R R+ R R R+R R<<R→A≈A1
②ⅰ ） O L v vt L o L v vt L o L i o t io L o L o o t v L i o t vtL L R R A A R R R A A R R R vv vv R R R v v A R vv AR R + = + = + == = → = = ( ) , 0
=A1(R,→>O) R on R+R R+R A=4 R+R R>>尺
ⅱ） o L i i n L o o i i n L o o i o n i o L o o o o n i L i o n i n R R A A R R R A A R R R i i i i R R R i i A R i i A + = + = + = = = ( → 0)
*对R的要求 ⅰ)输出量为v时,要求R<<RL,理想R。→0 ⅱ)输出量为讠时,要求R。>>R1,理想R。→O R R R R1 R、R1 R R R RoRLII VO R
* 对Ro的要求 ⅰ）输出量为νo时，要求Ro＜＜RL，理想Ro→0 ⅱ）输出量为ίo时，要求Ro＞＞RL，理想Ro→∞ RS Rί RL Rο νοt + ν - s νί + + - - + - RS Rί νs νί + - - + νo RS Rί Rο RL νο ί s + - ίοn ί ί ίo Rο RL νο + - ίοn ίo RL Rο νοt + - + - νo RS ί s ί ί Rί
③源增益 R → +r Ayr.+r R R R R+r R+R R.<<R→A.≈A
③源增益 ⅰ） ⅱ） i s vs v i s i v s i i o s o vs i s i i s s o vs R R A A R R R A v v v v v v A R R R v v v v A + = = = + = = i s i s i i s s i s i i o s o i s i s s i s s o i s R R A A R R R A i i i i i i A R R R i i i i A + = = = + = =