通用集成运算放大器电路测试方法 - KanWoDa

1 1 1 OP07A (AD712) (LM124) 2 (LM12) OPA445 3 (AD515 LF353) 4 OP37A (AD847) 5 AD811 (CA3180) 6 INA128 (LM386) (AD845) BB3656 2 INTERSIL 1 2008-9-10 1 2 3 4 IEC LTX 77 1

2 A DUT a 60Db b 2 2008-9-10 c a RI*IIB<<VIO b R<<RIO c R*IIB>>VIO d ROS<<RF<<RIO e R1=R2 f R1>>RL g RF/RI IIB----------- VIO---------- RIO---------- ROS--------- RI=50 OHM RF=10K OHM R1=R2=100K OHM RL=2K,10K OHM LF353 2 10 2 1 VOS 2 1 1 2 1 2 2 1 3 VOS 2 A 40DB 3 2008-9-10 DUT VL=(VOS+IOS*RI)(1+RF/RI) IOS*RI<<VOS RF/RI>>1 VOS RI/RF*VL=VL/(RF/RI) RF=10K RI=50 OHM VOS=VL/200 VL VOS 2 1 4 1 K4 VREF LTX-77 VS1 VREF + 2 &VOS=(VOS2-VOS1)/(TA2-TA1) 3) 1 5 4 PWM VOS 4 VO=(VOS+IOS*RI)*(1+RF/RI) RF=10K RI=100 OHM 4 2008-9-10 100 VOS=VO/100 VO VOS 2 2 IOS 2 2 1 2 2 2 2 2 3 IOS 5 K1 K2 R VL1=(1+RF/RI)*(VOS+IOS*RI) K1 K2 R VL2=(1+RF/RI)*(VOS+IOS*RI+IOS*R) VL2-VL1=(1+RF/RI)*IOS*R IOS=(VL2-VL1)/(R*(1+RF/RI))

3 RF/RI=200 IOS=(VL2-VL1)/(200*R) R &VL IOS 2 2 4 1 K4 VREF LTX-77 VS1 VREF + 2 &IOS=(IOS2-IOS1)/(TA2-TA1) 3) R RI RF IOS*R>>VOS IOS*(RI RF)<<VOS R RI RF 2 3 IB 5 2008-9-10 2 3 1 IB=(IB_+IB+)/2 2 3 2 2 3 3 IB IOS K1 K2 VL1=(1+RF/RI)*(VOS+IB-*R+IOS*RI) K2 K1 VL2=(1+RF/RI)*(VOS-IB+*R+IOS*RI) VL1-VL2=(1+RF/RI)*(IB_+IB+)*R IB=(IB_+IB+)/2=(VL1-VL2)/(R*(1+RF/RI)) RF/RI=200 IB=&VL/(400*R) 5 R PA UA 106 R LTX-77 6 A2 IB< 10PA K3 2 DUT IB+ IB_ K1 K2 K3 A2 VA A2 IB_ A2 VA IB_=VA/R9 10Na 6 2008-9-10 10Na R9 VA IB+( IB_) A2 K4 C IB+( IB_) T1 VA1, A2 IB+( IB-) T2 A2 VA2 IB+( IB_) IB+( IB_)=K*(VA2-VA1)/(T2-T1)

4 K IB IOS IB=(IB++IB-)/2 IOS=IB+-IB- A2 AD515 R9=1 MOHM C=100PF T2-T1=100ms 2 4 PD 2 4 1 2 4 2 7 2 4 3 K4 V+ V- I+ I- PD PD=(V+*I+)+(V-*I-) 2 4 4 1) LTX-77 OPEN VI4 2) LM118 AD847 CLOSE CBITS A BITS 10 3) 7 2008-9-10 2 5 Avd 2 5 1 2 5 2 8 8 2008-9-10 2 5 3 Avd 8 Avd RL R1 RL R1 K4 1 +VREF VO1=-VREF VL1=-(1+RF/RI)*(VREF/Avd)+(1+RF/RI)*(VOS +IOS*RI) K4 2 -VREF VO2=+VREF VL2=(1+RF/RI)*(VREF/Avd)+(1+RF/RI)*(VOS+ IOS*RI) VL2-VL1=2*(1+RF/RI)*(VREF/Avd) Avd (RF/RI)*2*VREF/(VL2-VL1) RF/RI=200 VREF=10V Avd=200*20V/&VL Avd=20*log(200*20V/&VL) (dB)

5 &VL Avd 2 5 4 1 LTX-77 2 3 +Avd (-Avd) 4 140dB 2 6 Vopp 2 6 1 2 6 2 8 2 6 3 K4 1 DUT VO1 K4 2 DUT VO2 VO2 VO1 2 6 4 1 VREF (Vopp) VREF VS 2 LM12 VS-Vopp 3 PWM 2 7 KSRR 2 7 1 2 7 2 9 2 7 3 KSRR 9 K 1 DUT 9 2008-9-10 VS A VL1 (VL1=VOS) K 2 DUT +VS+&V -VS-&V VL2 K 3 DUT +VS-&V -VS+&V VL3 KSRR &VO/&VS KSRR1=(VL2-VL1)/(2*&V)*(RI/(RF+RI)) KSRR2=(VL3-VL1)/(2*&V)*(RI/(RF+RI)) &V A VL4 KSRR+=(VL4-VL1)/&V*(RI/(RI+RF)) &V A VL5 KSRR-=(VL5-VL1)/&V*(RI/(RI+RF)) 2 7 4 1 A KSRR KSRR 2 KSRR 3 2 8 CMRR 2 8 1 2 8 2 10 11 2 8 3 CMRR 10 K 1 10 2008-9-10 A VL1 VL1=(1+RF/RI)*(VOS+IOS*RI)+(1+RF/RI)

6 *VIC+/CMRR K 2 VL2 VL2=(1+RF/RI)*(VOS+IOS*RI)+(1+RF/RI)*VIC -/CMRR VL1-VL2=(1+RF/RI)*(VIC+-VIC_)/CMRR CMRR=(1+RF/RI)*( VIC+-VIC_)/&VL CMRR=20*LOG((1+RF/RI)*( VIC+-VIC_)/&VL) VL1 VL2 CMRR RF RI CMRR CMRR 11 K 1 VCC+VS VEE VEE+VS VS DUT DUT VS K 2 VCC VCC-VS VEE VEE-VS DUT -VS DUT -VS 11 RF RI 1+RF/RI RF RI 10% 11 2008-9-10 2 8 4 2 9 1 CMRR VIC <VICM VICM 2 CMRR VS <Vopp Vopp 3 80dB Sr 2 9 1 2 9 2 12 12 2008-9-10

7 2 9 3 Sr 12 Vo tt Sr Sr= Vo/tt 2 9 4 1 2 3 SAI710 TFE 50 OHM 4 LF157 Avd>5 5 Sr R 2 10 Unity Gain Bandwidth 2 10 1 1 0dB fGWB 2 10 2 13 2 10 3 fGWB 13 200 KHZ fin DUT Via DUT Voa fGWB=Avd1*fin Avd1 200 KHZ Fgwb=fin*(Voa/Via)*(1+RI/RF) Via=1v RI/RF=200 fin=200 KHZ Fgwb=200 KHZ*Voa*200 2 10 4 1 fpp<<fin<<fgwb fpp 13 2008-9-10 fpp=Sr/(2* *Vomax) 2 DUT 8 2 GB3442-85 << 14 2008-9-10