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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]
… 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 𝑣 ? 𝑣 𝑡𝑒𝑚𝑝 = 𝑣 ? 𝑣 𝑡𝑒𝑚𝑝 =
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 𝑣 𝐿 𝑣 𝑆 = 𝑅 𝐿 𝑅 𝑆 + 𝑅 𝐿 < 1 unless or 𝑅 𝐿 → ∞ (𝑅 𝐿 ≫ 𝑅 𝑆 ) 𝑅 𝑆 → 0 (𝑅 𝑆 ≫ 𝑅 𝐿 ) 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
Puzzle Resolved EE 40 Lecture 9: Input-Output Resistance 7 v o /v temp = Independent of R s !

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Application: DVM EE 40 Lecture 9: Input-Output Resistance 8
Application: …?

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

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