Precision Labs Op Amps Circuit Analysis
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Hello, and welcome to the presentation for the TI Precision Lab supplement for op amp input offset voltage (VOS) and input bias current (IB). This lab will walk through detailed calculations, SPICE simulations, and real-world measurements that greatly help to reinforce the concepts established in the op amp VOS and IB lecture.
Explore a detailed analysis of a circuit utilizing Precision Labs Op Amps, developed by Art Kay and Ian Williams. Calculate total output voltage considering offset voltage and bias current, analyze typical and maximum values for OPA211 and OPA188, and simulate results for different configurations. Gain insights into typical and maximum output errors for various parameters like VOS and IB.
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Presentation Transcript
VOS& IB Lab TI Precision Labs Op Amps Developed by Art Kay and Ian Williams 1
Experiment 2 RIN = 5k 2
Calculation RIN = 5k Calculate the total output voltage due to VOS and IB for the circuit shown below. Use the typical and maximum values for VOS and IBgiven on the next slide. Jumper Position Description OPEN C5 disconnected JMP13 CLOSED R15 connected JMP14 OPEN VIN+ connected to R15 JMP15 Calculate the result for both OPA211 and OPA188! 3
Calculation RIN = 5k PARAMETER OPA211 MIN TYP MAX UNIT Input Offset Voltage VOS 30 125 V Input Bias Current IB 60 175 nA PARAMETER OPA188 MIN TYP MAX UNIT Input Offset Voltage VOS 6 25 V Input Bias Current IB 160 1400 pA Device Typical Output Maximum Output OPA188 OPA211 15mV 191mV 71mV 2492mV 4
Calculation RIN = 5k OPA211 Calculate typical output error from Vos & Ib ib= 60nA RfR1 Rf+ R1 1k Rin= 5k Vib= ib Req+ ib Rin= 360 V Vos= 30 V Vout _error = G1G2(Vos+ Vib) Vout _error = 101 21( 30 V + 360 V) Vout _error = 827mV or 700mV Vout _error = 827mV Choose the largest Calculate maximum output error from Vos & Ib ib= 175nA RfR1 Rf+ R1 1k Rin= 5k Vib= ib Req+ ib Rin= 1050 V Vos= 125 V Vout _error = G1G2(Vos+ Vib) Vout _error = 101 21( 125 V + 1050 V) Vout _error = 2492mV or 1962mV Vout _error = 2492mV Choose the largest Req= Req= 5
Calculation RIN = 5k OPA188 Calculate typical output error from Vos & Ib ib= 160pA RfR1 Rf+ R1 1k Rin= 5k Vib= ib Req+ ib Rin= 0.96 V Vos= 6 V Vout _error = G1G2(Vos+ Vib) Vout _error = 101 21( 6 V + 0.96 V) Vout _error = 15mV or 11mV Vout _error= 15mV Choose the largest Calculate maximum output error from Vos & Ib ib= 1400pA RfR1 Rf+ R1 1k Rin= 5k Vib= ib Req+ ib Rin= 8.4 V Vos= 25 V Vout _error = G1G2(Vos+ Vib) Vout _error = 101 21( 25 V + 8.4 V) Vout _error = 71mV or 35mV Vout _error = 71mV Choose the largest Req= Req= 6
Simulation Results RIN = 5k Open switches JMP15 and JMP11, and close switches JMP14 and JMP10. Re-run the simulation to determine the new output voltage due to VOS and IB. OPA211 OPA188 Vout = -9.03mV Vout = -209.19mV 7
