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

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

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

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

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

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

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 +

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

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

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

Thevenin Circuit Cards Always Work 11

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

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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

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

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

Op Amp Level Shifter 17