L08 Operational Amplifiers

L08 Operational Amplifiers - EE 40 Operational Amplifiers...

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EE 40 Operational Amplifiers EE 40 Lecture 8: Operational Amplifiers 1
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What is Gain? EE 40 Lecture 8: Operational Amplifiers 2 ° ± = ² ∆³ ³ ´ Sensor output is small: = 0.05 … 5mV = 5V × 0.001 … 0.1% µ = · ¸ ∆¹ ¹ º Microcontroller input: ≈ 1V full scale ≈ 1mV resolution = 0.01 … 1V x 200 cf DVM
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Gain: Example - Radio Signal from antenna is small ( m V) Need to amplify to apply to speaker (… 100 V) (Radio receiver does also other things) Most sensors require amplification of output (e.g. strain sensor, temperature sensor, light sensor, …) EE 40 Lecture 8: Operational Amplifiers 3 ? m V V
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Voltage Gain EE 40 Lecture 8: Operational Amplifiers 4 vo = Av vi
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Gain - General Input and output can be voltage or current Gain S x = s o / s i Example: s i = i i s o = v o S x = v o / i i = R x (“transresistance amplifier”) EE 40 Lecture 8: Operational Amplifiers 5
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Ideal Operational Amplifier OpAmp Symbol Characteristics i i+ = i i- = 0 v o = a v (v i+ - v i- ) a v EE 40 Lecture 8: Operational Amplifiers 6
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Gain a v ∞ ??? Who needs this?
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This note was uploaded on 01/15/2011 for the course EE 40 taught by Professor Chang-hasnain during the Spring '07 term at University of California, Berkeley.

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L08 Operational Amplifiers - EE 40 Operational Amplifiers...

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