ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower,...

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ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara [email protected] 805-893-3244, 805-893-3262 fax

Transcript of ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower,...

Page 1: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

ECE137A, notes set 5: Source Follower, Emitter Follower

Mark Rodwell

University of California, Santa Barbara

[email protected] 805-893-3244, 805-893-3262 fax

Page 2: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Emitter Follower, Source Follower

Page 3: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Analysis:

EER LR

eqLLEECE RRRR ,||||

CER

Page 4: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Analysis:

eqLR ,

Page 5: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Emitter Follower Voltage Gain

Page 6: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Impedances in the Emitter Follower

on.degenerati-emitterfor derivedearlier formulas from Follows

CER

Page 7: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Overall Voltage Gain

Page 8: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Emitter Follower: Example (1)

Page 9: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Emitter Follower: Example (2)

Page 10: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Emitter Follower: Example (3)

Page 11: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Emitter Follower: Example (4)

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Emitter Follower: Example (5)

Page 13: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Emitter Follower: Example (6)

Page 14: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Source Follower Example

regioncurrent -constantin iticscharacters FET Recall gsD VI

VVV

VVVVWcvWI

thgs

DSthgsgoxsatgD

for

)1)(2/(/

VVV

VVVLWcWI

thgs

DSthgsggoxgD

for

)1())(2/(/ 2

Page 15: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Source Follower Example (2)

:parameters FET

V2.0

V256.02/ VVth

V313.0 VVth

)(SiO 8.3 nm,1 cm/s,10 s,V/cm400 2oxr,

72 oxsat Tv

222

oxr,0ox m)fF/(6.33f/m106.33/

oxTc

device) threshold-(low V2.0 2007), art, of (state nm45 thg VL

mV113/ gsatLvV

m/mA/V 0.15)2/( 2 gox Lc

mmA/V/ 36.3 oxsatcv high) are numbers (these

mmA/V/ 36.3

m/mA/V 0.15 2

Page 16: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Source Follower Example (3)

m5.1 10V,1/ :FET gW

voltageknee assuming for

)1)(V256.0(mA/V05.5

DSthgs

DSgsD

VVVV

VVI

problemour work and s,assumption bias thesestart with usLet

Page 17: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Source Follower Example (4)

Ohms3001/3.0 mAVRSS

0.454V0.256V/V)mA/(5.05mA1 gsV

VVVV sgsg 754.0

ggg VRR desired theprovide and 21

analysis. bias DCin Neglect :ionApproximat

solution biasDC a have now We

Page 18: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Source Follower Example (5)

226||||

10kV/1mA10/1

5.05mS5.05mA/V

LSSDSLeq

DDS

m

RRRR

IR

g

analysis AC

53.0)/1/(/

49.0)/(/

185754||246

,,

,

mLeqLeqinout

genAinAingenin

Ain

gRRVV

RRRVV

kkkR

designgreat aNot

Page 19: ECE137A, notes set 5: Source Follower, Emitter Follower · ECE137A, notes set 5: Source Follower, Emitter Follower Mark Rodwell University of California, Santa Barbara rodwell@ece.ucsb.edu

Emitter Followers vs Source Followers

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Emitter Followers vs Source Followers

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Source Follower Output Impedance


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