L09 Input Output Resistance

L09 Input Output Resistance - EE 40 Input and Output...

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EE 40 Input and Output Resistance EE 40 Lecture 9: Input-Output Resistance 1
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Puzzle … EE 40 Lecture 9: Input-Output Resistance 2 Temperature [C] V x ,V y [V]
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… Analysis … EE 40 Lecture 9: Input-Output Resistance 3 r i = v t /i t r i = v t /i t
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… Solution EE 40 Lecture 9: Input-Output Resistance 4 ° ? ° ±²³´ = ° ? ° ±²³´ =
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What’s the Lesson? Source Sensor, Battery, … Model as Thévenin Equivalent Load Instrument, Amplifier, Speaker, … Model as Resistor Equivalent EE 40 Lecture 9: Input-Output Resistance 5 ° ± ° ² = ³ ± ³ ² + ³ ± < 1 unless or ³ ± → ∞ (³ ± ≫ ³ ² ) ³ ² → 0 (³ ² ≫ ³ ± ) Often very desirable to have either of these two situations. Use opamps!
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Input Resistance Inverting amplifier R i = v t /i t = Non-inverting amplifier R i = v t /i t = EE 40 Lecture 9: Input-Output Resistance 6
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Puzzle Resolved EE 40 Lecture 9: Input-Output Resistance 7 v o /v temp = Independent of R s !
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EE 40 Lecture 9: Input-Output Resistance 8
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L09 Input Output Resistance - EE 40 Input and Output...

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