1. Introduction to Electrical & Computer Engineering Circuit Design Cards 1 Dr. Cynthia Furse University of Utah

2. Circuit Design Cards How to Design SYSTEMS Simple Cards Thevenin Cards 2

3. Cards have: System Side Circuit Side 3 R1 R2 V2= VsR2 R1+R2 + Vs - Voltage Divider Vout= Vs / A + Vs - A Voltage Divider

4. Start with System Side Start with a Voltage 4 Vout= Vs / A + Vs - A Voltage Divider V th + - Thevenin Equivalent th R Divide It

5. Flip Cards to Circuit Side to Build Circuit 5 V th + - Thevenin Equivalent th R R1 R2 V2= VsR2 R1+R2 + Vs - Voltage Divider

6. Build a Circuit: Vo = 3V 1 + 4V 2 6 V1 Vo=AV1+BV2 V2 Non-Inverting Summer X X A B +

7. Build a Circuit: Vo = 3V 1 + 1/4V 2 Problem: G1 & G2 >=1 7 V1 Vo=AV1+BV2 V2 Non-Inverting Summer X X A B +

8. Build a Circuit: Vo = 3V 1 + 1/4V 2 8 V1 Vo=AV1+BV2 V2 Non-Inverting Summer X X A B + V in V out = -AV in Inverting Amplifier X V in V out =AV in Non-Inverting Amplifier X V in V out = -AV in Inverting Amplifier X

9. Build a Circuit: Vo = 3V 1 + 1/4V 2 9 Inverting Amplifier Vo = Vs (-Rf/Rs) Inverting Amplifier Vo = Vs (-Rf/Rs) Non-Inverting Amplifier Vo= Vs (R1+R2)/R2 Non-Inverting Summer

10. Simple Circuit Cards Work When Zout << Zin OR Buffer Between 10 Inverting Amplifier Vo = Vs (-Rf/Rs) Inverting Amplifier Vo = Vs (-Rf/Rs) Inverting Amplifier Vo = Vs (-Rf/Rs) Inverting Amplifier Vo = Vs (-Rf/Rs) V in V out =V in Unity Gain /Buffer Amplifier X

11. Thevenin Circuit Cards Always Work 11

12. Start on Left. Work towards Right. 12 Combine to get new Thevenin

13. 13

14. Build a Circuit: Vo = 3V 1 + 1/4V 2 14 V1 Vo=AV1+BV2 V2 Non-Inverting Summer X X A B + V in V out = -AV in Inverting Amplifier X V in V out =AV in Non-Inverting Amplifier X V in V out = -AV in Inverting Amplifier X

15. Build a Circuit: Vo = 3V 1 + 1/4V 2 15

16. Build a Circuit: Vo = 3V 1 + 1/4V 2 16

17. Op Amp Level Shifter 17