自举型高输入阻抗放大器 R 2R1 2R1 R R R 2R R (--)(-2)U1=2U R R RI 0. U-20.R-R A R R RR RR R 1.R-R自举型高输入阻抗放大器 I1 R 2R1 Ui A1 U0 A2 Rp R1 Rp R2 R2 I Ii U01 1 1 R R R R I U R i i i − = = - + + - A1 R U U R U I i i o i 1 1 − = + o Uo R R U 2 1 1 2 = − o Ui R R U 1 2 = − o Ui Ui R R R R U )( ) 2 2 ( 1 2 2 1 1 = − − = i i i i i U R R R R R U U R U I 1 1 1 2 − = − = +