2.An Instrumentation Amplifier-仪器用放大器 VN3 R + ZA-1A D A? ● R2 5 VP3 R V0= 2R2M-) (y3-a) 3-4=(1+R1 R3 4(1+ R3 电压增益:A,= 。-(+R 2) V1-V2 R32. An Instrumentation Amplifier-仪器用放大器 v o - + R 3 R 4 vN vP R 3 R 4 - + v3 -v 4 v 1 v 3 - + v 2 v 4 - + R 2 R 2 R 1 vN3 vP3 - + v1-v2 A 1 A 2 A 3 iR2 iR2 iR1 v 1 v 2 )vv() R R2 1(vv 1 2 43 21 )vv() R R2 1( R R )vv( R R v 1 2 21 3 4 43 3 4 O ) R 2 R 1( R R vv v A 1 2 21 v 3 电压增益: o 4