Lecture 12. Single Stage FET Amplifiers: Common Gate Amplifier Common Drain Amplifier. The Building Blocks of Analog Circuits - II
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1 Lecture 12 Single Stage FET Amplifiers: Common Amplifier Common Amplifier The Building Blocks of Analog Circuits II In this lecture you will learn: Common (CG) and Common (CD) Amplifiers Small signal models of amplifiers ECE 315 Spring 2007 Farhan ana Cornell Uniersity The Common Amplifier V DD VOUT out I OUT s V BIAS S G I G D S I D L V OUT out An attribute of the common source amplifier: The input resistance is ery large: in Not suitable for current amplifiers or transimpedance amplifiers ECE 315 Spring 2007 Farhan ana Cornell Uniersity 1
2 The Common Amplifier V DD Assume an AC short I S I D I OUT S s I BIAS V BIAS I G L V OUT out The gate terminal is common between the input and the output The common gate amplifiers are useful when small input resistances and large output resistances are desired in amplifiers (they also hae good high frequency performance but that will come later in the course) But the current gain is unity! Note: The bulk is not tied to the source ECE 315 Spring 2007 Farhan ana Cornell Uniersity The Common Amplifier: Same Topology, Different Look V DD I OUT D I D Assume an AC short I G G S I S L V OUT out V BIAS s S I BIAS The gate terminal is common between the input and the output The common gate amplifiers are useful when small input resistances and large output resistances are desired in amplifiers But the current gain is unity! Note: The bulk is not tied to the source ECE 315 Spring 2007 Farhan ana Cornell Uniersity 2
3 Choice of Sutrate Potentials D S B D S B N P N N P P P N N well P Sutrate In order to keep the source and drain PNjunctions with the sutrate (or bulk) reerse biased at all times, i) The Psutrate (for NFETs) is generally tied to the most negatie oltage in the circuit ii) The Nsutrate or Nwell (for PFETs) is tied to the most positie oltage in the circuit ECE 315 Spring 2007 Farhan ana Cornell Uniersity The Common Amplifier: Small Signal Model in g m S s out L Note: ECE 315 Spring 2007 Farhan ana Cornell Uniersity 3
4 The Common Amplifier: Short Circuit Current Gain g m Short circuit current gain: id iout i A out i 1 Short circuit current gain is unity! ECE 315 Spring 2007 Farhan ana Cornell Uniersity The Common Amplifier: Input esistance g m s out L Input resistance: g 1 m gmb r o out gs id gs id gm gmb gs L gs r o L gs L g in m gmb gs id gm gmb 1 gs in can be small if: gm gmb gs r i o g d m gmb 1 L 1 r gm gmb o L 1 L 1 1 Small in gs g 1 L m gmb gm gmb ECE 315 Spring 2007 Farhan ana Cornell Uniersity 4
5 The Common Amplifier: Open Circuit Voltage Gain Open circuit oltage gain: gm gmb r out id A out If: g m gmb 1 1 A gm gmb g m out 1 gm gmb gs o 1 1 gm gmb gs gs r ~ g g r o m mb o Large if is large out out gs id gm gmb gs gs gm gmb gs id gm gmb r i o 1 d gs ECE 315 Spring 2007 Farhan ana Cornell Uniersity The Common Amplifier: Output esistance S g m s D Output resistance: id gm gmb gs s 1 s gm gmb gs s D s 1 gm gmb id 1 s gm gmb ECE 315 Spring 2007 Farhan ana Cornell Uniersity 5
6 The Common Amplifier: Output esistance S g m D Output resistance: D s s gm gmb out D out depends on s s s gm gmb out can be large if is large ECE 315 Spring 2007 Farhan ana Cornell Uniersity The Common Amplifier: Transimpedance Gain Transimpedance gain: id g m out m i out i d i m can be large if is large ECE 315 Spring 2007 Farhan ana Cornell Uniersity 6
7 The Common Amplifier: A Current Buffer is g m S out L Compare with the standard current amplifier model: out can be large S i in in A i iin out out L in is small A i is unity It is a good current buffer!! ECE 315 Spring 2007 Farhan ana Cornell Uniersity The Common Amplifier: A Transimpedance Amplifier is g m S out L Compare with the standard transimpedance amplifier model: out can be large S i in in out m i in out L in is small m can be large It is a decent transimpedance amplifier!! ECE 315 Spring 2007 Farhan ana Cornell Uniersity 7
8 The Common Amplifier (or the Follower) V DD D I D I G G S S I S I OUT s V BIAS o L VOUT out The drain terminal is common between the input and the output The common drain amplifiers are useful when large input resistances and small output resistances are desired in oltage amplifiers The oltage gain is less than unity! Note: The bulk is not tied to the source ECE 315 Spring 2007 Farhan ana Cornell Uniersity s s The Common Amplifier: Small Signal Model o g m gs out L Note: out ECE 315 Spring 2007 Farhan ana Cornell Uniersity 8
9 The Common Amplifier: Open Circuit Voltage Gain o g m d out Open circuit oltage gain: gs out gs ido g r 1 g r out m o gs mb o out id o 1 1 g r g r g r mb o m o m o out gs out o 1 1 g r g r g r mb o m o m o out o gmo r A out o 1 g g r 1 m mb o o r o ECE 315 Spring 2007 Farhan ana Cornell Uniersity g d out d m gs mb out i g g d out m gs mb out gm gs 1 gmb out id Less than unity but can be ery close to unity The Common Amplifier: Input esistance o g m out L Input resistance: in Large ECE 315 Spring 2007 Farhan ana Cornell Uniersity 9
10 s The Common Amplifier: Output esistance o g m Output resistance: id o gm gs 1 gmb o gm 1 g r mb o o 1 1 gm gmb 1 out o d out can be small if: >> (g m g mb ) >>1 and/or if o is small g d d m gs mb i g g d m gs mb gm gs 1 gmb id ECE 315 Spring 2007 Farhan ana Cornell Uniersity s s The Common Amplifier: A Voltage Buffer o g m gs out L Compare with the standard oltage amplifier model: out can be small S s in in out A in out L in is large A can be almost unity It is a good oltage buffer!! ECE 315 Spring 2007 Farhan ana Cornell Uniersity 10
11 The common source (CS) topology: 1) Large input resistance 2) Large output resistance 3) Decent oltage gain 4) A decent oltage amplifier 5) A decent transconductance amplifier The CS, CG, and CD Topologies The common gate (CG) topology: 1) Can hae small input resistance 2) Large output resistance 3) Decent oltage gain 4) Unity current gain 5) A good current buffer 6) A decent oltage amplifier 7) A decent transimpedance amplifier The common drain (CD) topology: 1) Large input resistance 2) Small output resistance 3) Less than unity oltage gain 4) A good oltage buffer ECE 315 Spring 2007 Farhan ana Cornell Uniersity 11
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