Lect_12 - ECE 442 ECE 442 SolidState Devices & Circuits...

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CE 442 ECE 442 Solid State Devices & Circuits 12. IC Techniques Jose E. Schutt-Aine lectrical & Computer Engineering Electrical & Computer Engineering University of Illinois jschutt@emlab.uiuc.edu ECE 442–Jose Schutt Aine 1
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Amplifier with Diode-Connected Load Amplifier is single stage M1 driving a load impedance which is that looking into the source of M2 ECE 442–Jose Schutt Aine 2
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Output Impedance To calculate output impedance, connect oltage supply at source of voltage supply at source of M2 and measure current 2 22 2 2 2 2 s sm s m b s ds v ig vg v r  ECE 442–Jose Schutt Aine 3
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Output Impedance 2 2 1 s s v R g g g  222 2 sm m b d s ig  M1 sees this load in parallel with its own output pp impedance, r ds1 12 22 2 1 out ds S mm bd s R rR gg g ECE 442–Jose Schutt Aine 4
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Incremental model The source to-body voltage changes in M2 se transcond ctance term use transconductance term g mb2 1 1 22 2 1 m MB m out mm bd sd s g Ag R gg g g   ECE 442–Jose Schutt Aine 5
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Gain – Diode-Connected Amp 1 2 m MB m g A g  2( / ) mn o x D gC W L I 1/2 ( / ) W L I 11 22 (/ ) ) / ) no x D MB x D CW WL A CWL I   The magnitude of the voltage gain varies as the square root of the aspect ratio ECE 442–Jose Schutt Aine 6 qp
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High-Frequency – Diode-Connected Amp The amplifying stage has two upper corner frequencies; one caused by the input circuit and one caused by the output circuit. 1 2 in high g in f R C  1 2 out high out out L f R CC and ECE 442–Jose Schutt Aine 7
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High-frequeny: Simplified Model f in-high and f out-high may be widely or narrowly separated ECE 442–Jose Schutt Aine 8
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pMOS Diode-Connected Amp Analog Design Requirements – Load device can be replaced by pMOS transistor liminates body effect of the Eliminates body effect of the load device – Increases the resistance 1/ 2 /2         / 1/2 11 2 22 /3 / // no x n MB o x p CW L W L A L W L    ECE 442–Jose Schutt Aine 9 po 
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pMOS Diode-Connected Amp To approximate upper corner frequency, calculate 1122 out db g dd b gs CCC C C  The output impedance 2 1 2 11 out R g g g  22 m ds d sm gg  ECE 442–Jose Schutt Aine 10
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This note was uploaded on 05/05/2010 for the course ECE 329 taught by Professor Franke during the Spring '08 term at University of Illinois at Urbana–Champaign.

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Lect_12 - ECE 442 ECE 442 SolidState Devices & Circuits...

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