Chapter 5 - The Operational Amplifier

# Chapter 5 - The Operational Amplifier - Unit 4.3 The...

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1 Unit 4.3 - The Operational Amplifier Chapter 5

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2 The Operational Amplifier An active circuit element designed to perform mathematical operations of addition, subtraction, multiplication, division, differentiation, and integration .
3 The 741 Op Amp Inverting input Non-inverting input Output V + V - 2 3 7 4 6 1 5 Offset null - + - + Inverting input 2 Non-inverting input 3 V - 4 Offset null 1 7 V + 6 Output 5 Offset Null 8 NC

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4 Real World (Non-ideal) Op Amp All real op amps have: A finite input resistance R i A finite (but very large) gain called the open-loop gain (A) A non-zero output resistance R o v o R i Av d R o - + - v d +
5 Output Input Characteristics Output-Input Characteristics -20 -15 -10 -5 0 5 10 15 20 -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 Input Voltage vd in mV Output Voltage vo in V Positive Saturation Region Negative Saturation Region Linear Region + - + v 1 - + v 2 - - v d + + v o -

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6 The Ideal Operational Amplifier The ideal operational amplifier can be characterized as follows: Infinite open loop gain, A 2245 Infinite input resistance, R i 2245 Zero output resistance, R o 2245 0 v o R i Av d R o - + - v d +
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