Lecture 11. Active Devices -- BJT & MOSFET. Agenda: MOSFET Small-signal Model. Active Devices -- BJT & MOSFET. Cross-section
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1 EEL6935 Advanced MEMS (Spring 2005) Intructr: Dr. Huikai Xie Device -- BJT & MOSFET Agenda: Lecture Amplifier Baic Device mdel Current mirrr Single-tage amplifier Operatinal amplifier cnfiguratin Cr-ectin N/P/N Biplar Junctin Tranitr (BJT) n-channel Metal Oxide Semicnductr Field Effect Tranitr (n-channel MOSFET) EEL6935 Advanced MEMS 2005 H. Xie 2/4/2005 EEL6935 Advanced MEMS 2005 H. Xie 2 Device -- BJT & MOSFET MOSFET Small-ignal Mdel MOSFET Small-ignal Equivalent Circuit regin G C gd D v g C g g m v g r d C db S Cmmn-emitter cnfiguratin i C v. v CE DC characteritic with bae-emitter vltage (r bae current) a parameter Other cnfiguratin are cmmnbae and cmmn-cllectr Cmmn-urce cnfiguratin i D v. v DS DC characteritic with gate-t-urce vltage a parameter Other cnfiguratin are cmmngate and cmmn-drain EEL6935 Advanced MEMS 2005 H. Xie 3 EEL6935 Advanced MEMS 2005 H. Xie 4
2 Device Mdel Summary Device Mdel Summary Jhn and Martin, Analg Integrated Circuit Deign, p EEL6935 Advanced MEMS 2005 H. Xie 5 EEL6935 Advanced MEMS 2005 H. Xie 6 Device Mdel Summary Device Mdel Summary EEL6935 Advanced MEMS 2005 H. Xie 7 EEL6935 Advanced MEMS 2005 H. Xie 8
3 Device Mdel Summary Operating Pint R L v DS v D regin Operating pint i D = (v D -v DS )/R L Jhn and Martin, Analg Integrated Circuit Deign, p EEL6935 Advanced MEMS 2005 H. Xie 9 EEL6935 Advanced MEMS 2005 H. Xie 0 Dide-cnnected Tranitr Baic Current Mirrr v D ID R L regin regin R D I in I ut v DS Operating pint i D = (v D -v DS )/R L v GS = v DS i D = (v D -v DS )/R L Current can be adjuted by R L i D = (v D -v DS )/R L I D tay almt cntant fr a and are identical I in i et by R D V GS (and V GS2 ) are et by R D Thu I ut = I in I ut can exactly match I in r can be a fractin f it by adjuting the rati between (W /L ) and (W 2 /L 2 ) Current can tune V DS Sizing tranitr t adjut V D, with I D fixed EEL6935 Advanced MEMS 2005 H. Xie given V GS fr a wide range f V DS ( ) 2 µ ncx W I = V V 2 L D GS tn EEL6935 Advanced MEMS 2005 H. Xie 2
4 Cmmn-urce Amplifier Baic Single-Stage Amplifier Baic Single-Stage Amplifier Cmmn-drain Amplifier I D ( ) 2 µ ncx W I = V V 2 L D GS tn High input impedance lad Paive lad fr lw-gain, high frequency Mt ppular Surce fllwer Vltage buffer Vltage gain ~ but < Current gain EEL6935 Advanced MEMS 2005 H. Xie 3 EEL6935 Advanced MEMS 2005 H. Xie 4 Baic Single-Stage Amplifier High-Quality Current Mirrr Cmmn-gate Amplifier Cacde Current Mirrr Wiln Current Mirrr I ut I ut V bia Q 4 r ut Q 4 r ut Small input impedance lad Current amplificatin High utput impedance r ut = (r d2 g m4 )r d4 Impedance increaed by 0x t 00x Reduce utput wing High utput impedance Shunt-erie feedback r ut = r d4 (r d g m )/2 Reduce utput wing i nt required EEL6935 Advanced MEMS 2005 H. Xie 5 EEL6935 Advanced MEMS 2005 H. Xie 6
5 Cacde Gain Stage Differential Pair Telecpic-cacde Amplifier Flded-cacde Amplifier Q 4 r ut V bia C L V bia + - C L Cmmn-urce plu cmmn-gate High gain frm ingle tage 2 C L A V = g m z ut Limit the vltage acr the input tranitr Allw ame dc level fr input and utput ignal Slwer due t p-channel z ut = r ut // /(C L ) r ut = r d2 // r d4 EEL6935 Advanced MEMS 2005 H. Xie 7 EEL6935 Advanced MEMS 2005 H. Xie 8 General Amplifier Operatinal Amplifier Amplifier Saturatin hard limit at pwer upply limit Jargn: rail = pwer upply rail-t-rail Amplifier Nnlinearity dvo AV = dv I At perating pint (knwn al a Quiecent pint) v () t = V + v () t O O Operatinal Amplifier Baic building blck fr analg ignal prceing circuit Firt integrated circuit peratinal amplifier, µ709, made by Fairchild Semicnductr in 960 fllwed by the µ74. Cnit f active tranitr, reitr, and limited number f capacitr Apprximated by ingle-ple frequency repne Three tage Differential amplifier tage Amplifie difference between tw input High-gain amplifier tage Output amplifier tage Inverting input Pwer upply Output Ref. Sedra and Smith, Micrelectrnic Circuit, p. 6. v () t = V + v () t I I i Nn-inverting input Pwer upply Ref. Senturia, Micrytem Deign, p EEL6935 Advanced MEMS 2005 H. Xie 9 EEL6935 Advanced MEMS 2005 H. Xie 20
6 Operatinal Amplifier Operatinal Amplifier Nn-inverting Amplifier Integratr Differentiatr V R = + V R 2 Tranimpedance Amplifier Inverting Amplifier V V R2 = R v = RI v = V() t dt RC v = dv RC dt EEL6935 Advanced MEMS 2005 H. Xie 2 EEL6935 Advanced MEMS 2005 H. Xie 22
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