Lec 1 Intro OpAmp PDF
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Uploaded by FastPacedMarsh400
Suez Canal University
Dr Sherief Fathy
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Summary
This document introduces operational amplifiers (op-amps) and relevant concepts such as passive components, Ohm's Law, and symbol conventions in electrical engineering. It includes definitions and examples for understanding basic theoretical concepts that will be helpful in learning more about op-amps.
Full Transcript
Introduction DR SHERIEF FATHY Lecture Outline Passive components Ohm Law Symbol Convention « AC , DC , (AC+DC) » Amplifiers Operational Amplifier (Op-Amp) 2 Passive components: Resistors(R), Capacitors (C), and Inductors (L)...
Introduction DR SHERIEF FATHY Lecture Outline Passive components Ohm Law Symbol Convention « AC , DC , (AC+DC) » Amplifiers Operational Amplifier (Op-Amp) 2 Passive components: Resistors(R), Capacitors (C), and Inductors (L) 3 Ohm Law VR = IR * R V+ = V- + IR * R V+ V- V- = V+ - IR * R IR = (V+ - V-) / R Example: Let: RD = 1KΩ IR = (V+ - V-) / RD = (VDD – VD) / RD = (5-0.1)/1K = 4.9mA 4 Symbol Convention AC , DC , (AC+DC) The total instantaneous current iC(t) is the sum of the dc current IC and the ac signal current ic(t). where the ac signal current is given by: 5 Amplifiers Most amplifiers are primarily intended to operate on very small input signals. Their purpose is to make the signal magnitude larger, and therefore they are thought of as voltage amplifiers. Amplifier Circuit Symbol 6 Voltage Amplifiers 7 Voltage, Current, and Power Gains 1. Voltage Gain 2. Current Gain 3. Power Gain 8 Expressing Gain in Decibels 9 The Amplifier Power Supplies DC Power PDC: Total Input Power = Total Output Power Amplifier Efficiency: 10 Amplifier Saturation 11 Circuit’s Input / Output Resistances 𝒗𝒙 𝑹𝒊𝒏 = 𝒊𝒙 𝒗𝒙 𝑹𝒐𝒖𝒕 = 𝒊𝒙 ; vin = 0 (S.C.) 12 Operational Amplifier (Op-Amp) General Equivalent Circuit of Op-Amp 13 IDEAL OP-AMP A is called the differential gain, another name that we will attach to A: the open-loop gain. 14 IDEAL OP-AMP 𝑽+ = 𝑽− 𝒊+ = 𝒊− = 𝟎 15 Revision These topics are required as a prerequisite for this course: Kirchhoff Current Law (KCL) Kirchhoff Voltage Law (KVL) Thevenin Theorem Superposition Theorem 16 References 17 End of the Lecture 18