Lect_12 - ECE442 SolidStateDevices&Circuits 12.ICTechniques Jose E Schutt-Aine Electrical Computer Engineering University of Illinois

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ECE 342–Jose Schutt Aine 1 ECE 442 Solid State Devices & Circuits 12. IC Techniques Jose E. Schutt-Aine Electrical & Computer Engineering University of Illinois [email protected]
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ECE 342–Jose Schutt Aine 2 Amplifier with Diode-Connected Load Amplifier is single stage M1 driving a load impedance which is that looking into the source of M2
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ECE 342–Jose Schutt Aine 3 Output Impedance 2 22 2 2 2 2 s sm s m b s ds v ig vg v r =+ + To calculate output impedance, connect voltage supply at source of M2 and measure current
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ECE 342–Jose Schutt Aine 4 Output Impedance 2 2 222 2 1 s s sm m b d s v R ig g g == ++ 12 22 2 1 1 out ds S mm bd sd s Rr R gg g g + & M1 sees this load in parallel with its own output impedance, r ds1
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ECE 342–Jose Schutt Aine 5 Incremental model The source to-body voltage changes in M2 Î use transconductance term g mb2 1 1 22 2 1 m MB m out mm bd sd s g Ag R gg g g =− ++ +
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ECE 342–Jose Schutt Aine 6 Gain – Diode-Connected Amp 1 2 m MB m g A g ≈− 2( / ) mn o x D gC W L I μ = 1/2 11 22 / ) (/ ) ) / ) no x D MB x D CW L I WL A CWL I =− The magnitude of the voltage gain varies as the square root of the aspect ratio
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ECE 342–Jose Schutt Aine 7 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 π = () 1 2 out high out out L f R CC = + and
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ECE 342–Jose Schutt Aine 8 High-frequeny: Simplified Model f in-high and f out-high may be widely or narrowly separated
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ECE 342–Jose Schutt Aine 9 pMOS Diode-Connected Amp Analog Design Requirements – Load device can be replaced by pMOS transistor – Eliminates body effect of the load device – Increases the resistance () 1/2 11 22 /3 / // no x n MB po x p CW L W L A L W L μ ⎡⎤ =≈ ⎢⎥ ⎣⎦
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ECE 342–Jose Schutt Aine 10 pMOS Diode-Connected Amp
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This note was uploaded on 01/24/2012 for the course ECE 342 taught by Professor Nareshshanbhag during the Spring '11 term at University of Illinois, Urbana Champaign.

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Lect_12 - ECE442 SolidStateDevices&Circuits 12.ICTechniques Jose E Schutt-Aine Electrical Computer Engineering University of Illinois

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