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ho25.l22_design_example

# ho25.l22_design_example - Lecture 22 Design Example R...

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1 Lecture 22 Design Example R. Dutton, B. Murmann R. Dutton, B. Murmann 1 EE114 (HO #25) Stanford University Example From Lecture 17 V DD 3 2 1 1 mb CG CS m g R R g A + A v2 M1 M2 V out V B1 C L M3 I B3 I B2 2R CS 2R CS I B1 I B2 R CG M2' Specifications: 3 m g 0.8 R. Dutton, B. Murmann 2 i in I B1 C in EE114 (HO #20) • A = 20k Ω • f-3dB = 30MHz •C in = 0.5pF L = 1pF • Minimize power

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2 Significant Capacitances V DD B2 B1 B2 M2 V out V B1 M3 I B3 I I I R CG M2' M1 C i2 = C gs2 +C gd1 +C db1 C gd2 C i3 = C gd3 +C db2 C gs3 C o = C L +C sb3 R. Dutton, B. Murmann 3 i in I B1 C i1 = C in +C gs1 +C sb1 EE114 (HO #20) Time Constants 3 2 1 1 1 3 2 1 CS i C CG i C m i C R C R C g C i i i = τ = τ = τ () 3 3 3 3 3 3 2 2 5 1 5 1 1 3 2 m CS gs mb m mb CS gs C CS CG m CS CG gd C g R C g g g R C R R g R R C gs gd + + + + = τ + + = τ A/0.8 R. Dutton, B. Murmann 4 EE114 (HO #20) 3 3 3 2 1 1 1 m L mb m o C g . C g g C o + = τ
3 Sum of Time Constants (1) () 2 3 2 3 2 2 1 2 1 8 0 6 L gd gs gd i CS gd i CG i total g C C A C C C R C C R g C + + + + + + + τ Pretty messy; must simplify For our technology, we know (see appendix) 3 2 3 2 3 2 2 2 1 1 1 1 3 1 2 1 8 0 6 m L gd gs gd gd db CS gd gs gd db CG m gs in m m g . C C . A C C C C R C C C C R g C C . . + + + + + + + + + + + R. Dutton, B. Murmann 5 –C db /C gs 0.33 gd /C gs 0.25 –g mb /g m 0.2 EE114 (HO #20) Sum of Time Constants (2) C C ( ) [] 3 3 2 2 2 2 2 1 2 1 1 3 2 3 2 2 1 1 1 2 1 42 0 58 0 25 0 25 1 58 0 8 0 2 1 25 0 8 0 42 0 58 0 25 1 58 0 m L gs gs m v gs v gs v m gs in m L gs gs gs CS gs gs CG m gs in total g . C C . C . g A C A . . C . A . A g C C g . C C . . A C . C . R C . C . R g + + + + + + + + + + + + + + τ τ 1 τ 2a τ 2b τ 3 R. Dutton, B. Murmann 6 EE114 (HO #20)

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4 Optimization Strategy (1) Decide on τ 1 / τ total (var1) – Reasonable guess: 10% Decide on C gs1 /C in (var2) – Reasonable guess: 1 Decide on τ 3 / τ total (var3) – Reasonable guess: 10% Pick A v2 (var4) – Reasonable guess: 10 R. Dutton, B. Murmann
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ho25.l22_design_example - Lecture 22 Design Example R...

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