Microelectronics Circuit Analysis and Design. NMOS Common-Source Circuit. NMOS Common-Source Circuit 10/15/2013. In this chapter, we will:

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1 Mcrelectrncs Crcut Analyss and Desn Dnald A. Neaen Chapter 4 Basc FET Aplfers In ths chapter, we wll: Inestate a snle-transstr crcut that can aplfy a sall, te-aryn nput snal Deelp sall-snal dels that are used n the analyss f lnear aplfers. Dscuss and cpare the three basc transstr aplfer cnfuratns. Analyze the cn-surce aplfer. Analyze the surce-fllwer aplfer. Analyze the cn-ate aplfer. Analyze ulttransstr r ultstae aplfers. Neaen Mcrelectrncs, 4e Chapter 4-1 Neaen Mcrelectrncs, 4e Chapter 4-2 NMOS Cn-Surce Crcut NMOS Cn-Surce Crcut Neaen Mcrelectrncs, 4e Chapter 4-3 Neaen Mcrelectrncs, 4e Chapter 4-4 1

2 NMOS Cn-Surce Crcut NMOS Cn-Surce Crcut Neaen Mcrelectrncs, 4e Chapter 4-5 Neaen Mcrelectrncs, 4e Chapter 4-6 NMOS CS Crcut Sple NMOS Sall-Snal Equalent Crcut phasr cpnents n parentheses Neaen Mcrelectrncs, 4e Chapter 4-7 Neaen Mcrelectrncs, 4e Chapter 4-8 2

3 r r Sple NMOS Sall-Snal Equalent Crcut ecall the slpe n the MOSFET characterstc cure! The effect s that f dran t surce resstance r. = ( D DS = [ λk n 1 ( V GSQ V TN ] 2 1 [ λi ] 1 DQ NMOS Transstr Sall-Snal Paraeters Values depends n Q-pnt = D GS = 2K r = ( D DS r = [ λk = n n ( V 1 ( V d s GSQ GSQ V V TN = 2 ] 2 1 TN K n I [ λi DQ ] 1 DQ Neaen Mcrelectrncs, 4e Chapter 4-9 Neaen Mcrelectrncs, 4e Chapter 4-10 NMOS Cn-Surce Crcut Prble-Sln Technque: MOSFET AC Analyss AC Sall-snal 1. Analyze crcut wth nly the dc surces t fnd quescent slutn. Transstr ust be based n saturatn ren fr lnear aplfer. 2. eplace eleents wth sall-snal del. 3. Analyze sall-snal equalent crcut, settn dc surces t zer, t prduce the crcut t the te-aryn nput snals nly. A = V V = ( r D Neaen Mcrelectrncs, 4e Chapter 4-11 Neaen Mcrelectrncs, 4e Chapter

4 Cn-Surce Cnfuratn Sall-Snal Equalent Crcut DC analyss: Cupln capactr s assued t be pen. AC analyss: Cupln capactr s assued t be a shrt. DC ltae supply s set t zer lts. A = V V = ( r D ( + S Neaen Mcrelectrncs, 4e Chapter 4-13 Neaen Mcrelectrncs, 4e Chapter 4-14 DC Lad Lne Cn-Surce Aplfer wth Surce esstr Q-pnt near the ddle f the saturatn ren fr axu syetrcal utput ltae swn,. Sall AC nput snal fr utput respnse t be lnear. Neaen Mcrelectrncs, 4e Chapter 4-15 Neaen Mcrelectrncs, 4e Chapter

5 Sall-Snal Equalent Crcut fr Cn-Surce wth Surce esstr Cn-Surce Aplfer wth Bypass Capactr Sall-snal equalent crcut D A = 1 + S Neaen Mcrelectrncs, 4e Chapter 4-17 Neaen Mcrelectrncs, 4e Chapter 4-18 NMOS Surce-Fllwer r Cn Dran Aplfer Sall-Snal Equalent Crcut fr Surce Fllwer A = ( + S 1 + S r S r Neaen Mcrelectrncs, 4e Chapter 4-19 Neaen Mcrelectrncs, 4e Chapter

6 Deternn Output Ipedance NMOS Surce Fllwer Cn-Gate Crcut O 1 = S r Neaen Mcrelectrncs, 4e Chapter 4-21 Neaen Mcrelectrncs, 4e Chapter 4-22 Sall-Snal Equalent Crcut fr Cn Gate Cparsn f 3 Basc Aplfers Cnfuratn Vltae Gan Current Gan Input esstance Output esstance Cn Surce A > 1 TH Mderate t hh Surce Fllwer A 1 TH Lw A ( D L = 1 + S I A = I O D = ( + D L S ( 1+ S Cn Gate A > 1 A 1 Lw Mderate t hh Neaen Mcrelectrncs, 4e Chapter 4-23 Neaen Mcrelectrncs, 4e Chapter

7 NMOS Aplfer wth Enhanceent Lad Dece CMOS Cn-Surce Aplfer Neaen Mcrelectrncs, 4e Chapter 4-25 Neaen Mcrelectrncs, 4e Chapter 4-26 Sall-Snal Equalent Crcut fr CMOS Cn Surce CMOS Cn Gate A = n ( r r p n Neaen Mcrelectrncs, 4e Chapter 4-27 Neaen Mcrelectrncs, 4e Chapter

8 Cascade Crcut Sall-Snal Equalent Crcut fr Cascade Crcut Neaen Mcrelectrncs, 4e Chapter 4-29 Neaen Mcrelectrncs, 4e Chapter 4-30 PMOS Cn-Surce Crcut PMOS Cn-Surce Crcut A = V V = ( r D A = V V = ( r D Neaen Mcrelectrncs, 4e Chapter 4-31 Neaen Mcrelectrncs, 4e Chapter