Berkeley ELENG 105 - Current Mirrors (3 pages)
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Lecture Notes
- Pages:
- 3
- School:
- University of California, Berkeley
- Course:
- Eleng 105 - Microelectronic Devices and Circuits
Microelectronic Devices and Circuits Documents
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4 pages
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Lecture 8: Electrons and hole currents, IC Resistors
19 pages
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4 pages
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EE 105 Formal Laboratory Report Guidelines
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Lecture 18 Frequency-Domain Analysis Second-Order Circuits
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15 pages
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Report 5, Single Stage BJT Amplifiers, Common Collector and Common Base
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Report 9 MOS Characterization and Amplifiers
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19 pages
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18 pages
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22 pages
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Lecture 18 Frequency-Domain Analysis Second-Order Circuits
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Frequency-Domain Analysis Second-Order Circuits
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31 pages
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Lecture 20: Frequency Response: Miller Effect
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Lecture 2: Semiconductor Basics
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26 pages
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Two-Port Models Common-Source Amplifiers Revisited
5 pages
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16 pages
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26 pages
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Electrons and hole currents, IC Resistors
10 pages
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Experiment 3 - Bipolar Junction Transistor Characterization
3 pages
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11 pages
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Single Stage BJT Amplifiers: Common Emitter
4 pages
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Experiment 4 MOS Device Characterization
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13 pages
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Two-Port Models Common-Source Amplifiers Revisited
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Bipolar Junction Transistor Amplifiers – Frequency Response
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Gated Lateral BJT Characteristics
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25 pages
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Intro to Differential Amplifiers
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Report 5: Single Stage BJT Amplifiers: Common Collector and Common Base
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Common Source Amplifier Frequency Response
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Frequency Domain + Second Order
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Frequency Domain + Second Order
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Lecture 29: Review and Perspectives
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Bipolar Junction Transistor Small Signal Model
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Designing amplifiers, biasing, frequency response
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Lecture 20 Common Source Amplifier Frequency Response
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HP 6235A DC Power Supply Tutorial
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8 pages
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Lecture 7: IC Resistors and Capacitors
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Bipolar Junction Transistor Characteristics
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Lecture 6 Currents in PN Junction MOS Capacitor
15 pages
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14 pages
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Part I: MOS Small-Signal Models
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Introduction to Electronic Test Equipment
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Report 8 Multi-stage Amplifiers
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21 pages
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26 pages
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Common-Drain Amplifier Review of Phasors
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6 pages
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29 pages
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Lecture 18: Bipolar Single Stage Amplifiers
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Experiment 1 Introduction to PSpice
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MOS Transistor models: Body effects, SPICE models
9 pages
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31 pages
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Prelab 9: MOS Characterization and Amplifiers
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6 pages
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Experiment 1 Introduction to Electronic Test Equipment
9 pages
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Prelab 8: Multi-stage Amplifiers
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16 pages
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MOS Transistor Small-Signal Model Current Sources
6 pages
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Review, PN junctions, Fermi levels, forward bias
8 pages
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Review, PN junctions, Fermi levels, forward bias
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3 pages
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25 pages
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Single Stage BJT Amplifiers: Common Emitter
3 pages
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17 pages
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4 pages
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21 pages
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10 pages
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5 pages
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11 pages
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15 pages
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18 pages
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Prelab 10 Differential Amplifiers
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7 pages
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Lecture 37: Frequency response
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30 pages
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27 pages
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11 pages
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Experiment 7: Frequency Response
4 pages
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25 pages
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Current Sources and Voltage Sources
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17 pages
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5 pages
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MOS Transistor Small-Signal Model
5 pages
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Prelab 3: Bipolar Junction Transistor Characterization
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15 pages
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25 pages
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12 pages
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Prelab 10: Differential Amplifiers
3 pages
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22 pages
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2 pages
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19 pages
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Bipolar Junction Transistor Characteristics
6 pages
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3 pages
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4 pages
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8 pages
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24 pages
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Experiment 7: Frequency Response
4 pages
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Lecture 21: BJTs (Bipolar Junction Transistors)
19 pages
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25 pages
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13 pages
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22 pages
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19 pages
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Single Stage BJT Amplifiers: Common Collector and Common Base
3 pages
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24 pages
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MOS Transistor models: Body effects, SPICE models
18 pages
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21 pages
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17 pages
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Lecture 2: Frequency domain analysis, Phasors
14 pages
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Lecture 2: Frequency domain analysis, Phasors
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Lecture 21: BJTs (Bipolar Junction Transistors)
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Lecture 37 Multistage Amplifier Frequency Response
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22 pages
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Experiment 10: Differential Amplifiers
4 pages
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Experiment 10: Differential Amplifiers
4 pages
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13 pages
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5 pages
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3 pages
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19 pages
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Lecture 23: Active linear circuits
19 pages
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Report 10: Differential Amplifiers
4 pages
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Lecture 19: Multistage - Cascode
13 pages
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21 pages
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18 pages
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Frequency Analysis of a Common Source Amplifier
3 pages
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33 pages
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16 pages
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35 pages
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21 pages
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Report 2 Electronic Test Equipment
2 pages
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Lecture 24 Single stage amplifiers
17 pages
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25 pages
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24 pages
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Lecture 20: Frequency Response: Miller Effect
21 pages
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Lecture 11: P-N Diode capacitors, intro to small signal models
18 pages
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18 pages
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Lecture 6: Integrated Circuit Resistors
25 pages
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24 pages
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5 pages
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23 pages
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Derivation of The Ideal Diode Equation
3 pages
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Experiment 8: Multi-stage Amplifiers
3 pages
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23 pages
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10 pages
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20 pages
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25 pages
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12 pages
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9 pages
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25 pages
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33 pages
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2 pages
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15 pages
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Experiment 3 - The Curve Tracer
6 pages
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11 pages
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Microelectronic Devices and Circuits Overview
19 pages
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5 pages
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Lecture 15 Small Signal Modeling
29 pages
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5 pages
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MOS Current Sources Two-port Models
10 pages
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21 pages
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23 pages
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8 pages
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2 pages
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Multistage Amplifier Frequency Response
10 pages
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Experiment 1 Introduction to Electronic Test Equipment
9 pages
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15 pages
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24 pages
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3 pages
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Experiment 9 Multistage Amplifiers
5 pages
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14 pages
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Lecture 7 Properties of Materials for Integrated Circuits
23 pages
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Lecture 17 Frequency-Domain Analysis
14 pages
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10 pages
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Lecture 17: MOS transistors →digital
17 pages
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Micro Linear BiCMOS Chip Set for Undergraduate Laboratories in Microelectronic Devices and Circuits
37 pages
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Improved Inverter: Current-Source “Pull-Up”
7 pages
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22 pages
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23 pages
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Lecture 38: Frequency response
15 pages
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MOS Transistor MOS Sample and Hold
7 pages
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11 pages
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26 pages
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6 pages
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15 pages
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50 pages
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Time Constants Frequency Response of Common Drain/ Common Source Amplifiers
4 pages
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11 pages
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25 pages
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21 pages
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2 pages
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23 pages
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Common Source Amplifier Frequency Response
10 pages
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10 pages
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Designing amplifiers, biasing, frequency response
19 pages
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Second-Order Circuits Amplifier Frequency Response
12 pages
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Discussion Notes - Voltage Sources and Current Sources
6 pages
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17 pages
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Bipolar Junction Transistor Models
17 pages
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25 pages
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16 pages
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Unformatted text preview:
Discussion 8 Current Mirrors 1 Motivation Typical biasing schemes introduced in Chapters 4 and 5 fail to establish a constant collector current if the supply voltage or temperature is subject to change Although highly undesirable these are unavoidable effects in transistor operating conditions So how could we supply a constant current while avoiding supply and temperature dependence The answer is using current mirrors 2 Bipolar Current Mirror Assume that there is a golden current IREF that is essentially independent of external conditions Our goal is to produce Icopy that has same characteristics as IREF In short the black box could be realized as shown below Neglecting the base currents for now note that QREF diode connected and Q1 have equal VBE Therefore V IREF IS REF exp V VT Icopy IS 1 exp and hence Icopy VT IS IS REF I REF If QREF and Q1 are identical IS REF and IS 1 Icopy IREF Note that this holds true even though VT and IS vary with temperature Example Explain why the following circuits are bad current mirrors Example Find the expression for Icopy in terms of IREF 3 Effect of Base Current Thus far we have neglected the base current at node X by all transistors an effect leading to a significant error as the number of copies increases This error is due to a fraction of IREF that through the base rather than the collector of QREF Let us analyze the error with the following diagram For a large and moderate n the second term in the denominator is negligible and Icopy nIREF However as the number of copied current n increases so does the error in Icopy Let us try to suppress the error by introducing an emitter follower QF that is interposed between the collector of QREF and node X Note that we have assumed IC F IE F Now we have reduced the effect of the base current by a factor of In other words emitter follower allows room for more copied currents Example HW 7 Problem 1 Find the expression for Icopy in terms of IREF
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