《电路》（英文版）3-2 op-am—— resistor circuits

83-2 OP-AMP --resistor circuits N 0→U2=bc 0 0 R B R i=0 i=0 N P 0 Dr=0.UA=UB D=A(U4-UB)=cons tant The inverting OP-AMP circuit. R2 KCL R RI R2 ●● 0 and i=0 R 0 01 R, R2 R

§3-2 OP-AMP --resistor circuits Ri =  i N = 0 i P = 0 A cons t x A B c A B  = 0  =  = ( − ) = tan Ro = 0 →2 = C    = = →  → = → − + 0 0 0 i i R i i The inverting OP-AMPcircuit. i R R KCL x x = − + − 2 2 1 1 :      x = 0 and i = 0 1 2 1 2 2 2 1 1 0 R R or R R + = = −      A  B −  2 = +  x 0 N i P i  + + −  x R2 − +  2 − +  1 R1 i  + + −

The non-inverting OP-AMP circuit. at node r .-b KCL +i=0 R i=0 and =v 2 R R2 (U2>U1) R Example 3-1: In the inverting and non-inverting OP-AMP circuit, gains are 10. Find Ri,r2. For the inverting circuit. R 10,2=10,f:R1=10k,then,R2=100k R, For the non-inverting circuit. 4101+2=10,j:R1=10k,hem,2=90k R1

The non-inverting OP-AMPcircuit. : 0 2 2 1 + = − + i R R KCL at node x  x  x  1 i = 0, and  x = Example 3-1:In the inverting and non-inverting OP-AMP circuit, gains are 10. Find R1 , R2 . For the non-inverting circuit: ( ) 2 1 1 2 1 2 1 1      = +   R R R2 x  x − +  2 − +  1 i R1 +  + − For the inverting circuit: 10, 10, : 10 , , 100 . 1 2 1 2 1 2 i f R k then R k R R = = = =   10,1 10, : 10 , , 90 . 1 2 1 2 1 2 i f R k then R k R R = + = = =  