03_Single_Stage_Amp

03_Single_Stage_Amp - 1 WLCHEN EE6326 Analog IC Design Fall...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 WLCHEN EE6326 Analog IC Design Fall 2008 Topic 3. Single-stage Amplifiers Wenliang Chen, Ph.D. Instructor 2 WLCHEN Outline MOSFET Single Stage Amplifiers Common Source Common Drain (Source Follower) Common Gate Circuit examples and systems BJT Single Stage Amplifiers- (if time allowed) 3 WLCHEN MOSFET Terminal Impedance All MOSFETs are dc biased in saturation already then ac small-signal is applied to the corresponding terminal. G D S rg rg ~ rd ~ 1/gds = rds =1/ ID G D S rd ac gnd G D S rs rs = 1/(gm+gds) ~ 1/gm ac gnd G D S rd ac gnd rd = 1/(gm+gds) ~ 1/gm 4 WLCHEN Terminal Impedance of Diode-Connected MOSFET g m v gs g mbs v bs Vbs=0 g ds G S S D +- v gs i x v x +- m m ds x x m ds x x m ds x x g g g i v rd g (g v v g r v i 1 1 ) + = = + = + = G D S rd ac gnd B If V DS > V TN , V DS > V GS-V TN , V DS > V DS-V TN , always in saturation. 5 WLCHEN Important Amplifier Characteristics I n p u t t e r m i n a l O u t p u t t e r m i n a l Output Swing/ large-signal characteristics Input impedance: Zin (Rin) Output impedance: Zout (Rout) Voltage gain : av L i n e a r i t y Noise* (will be discussed later) 6 WLCHEN Two Port Small-signal Analysis v in +- R in R out +- a v x v in +- v out i in i out input at v 0, i in out v v out out out i in in in in out in out | v v a | i v R | i v R = = = = = = Input impedance Output impedance Open circuit voltage gain R in , R out , a v 7 WLCHEN CS Amplifier with Resistor Load Vout Vin Vth Vin1 Vout1 Cutoff Saturation Triode out m ds D m in out ds D out in r g ) r || (R g v v ) (r || R r r = = = = Vout1 > Vin1 Vth for saturation Vin1 Vout1 < Vth Vout1 < Vout < V DD R D v out v in V DD r in r out V DD D t GS DD D D DD out 2 GST t GS D R ) V K(V V R I V V V ) V (V I 2 2 = = = introduces excessive nonlinearity. 8 WLCHEN Common-Source/Common-Emitter Amplifier . technology by fixed is a 100 25m 2.5 V R I ~ a , technology 5V for 2.5V ~ V R I If V R I r (R V I r g a v T C C v CC C C T C C o C T C out m v = = = = ~ 2 1 ~ ) || R C v out v in V CC R D v out v in V DD . 2 1 ~ ) || GST v GST GST D D v DD D D GST D D ds D GST D out m v V designing by adjusted be can a V 5 V R 2I ~ a , technology 5V for 2.5V ~ V R I If V R 2I r (R V 2I r g a = = = = 9 WLCHEN CS amplifier with diode-connected load v out v in V DD r in r out r 2 m2 m1 out m1 in out m2 ds2 m2 ds1 2 ds1 out in g g r g v v g 1 g g g 1 ~ ) (r || r r r = + + = = ~ ~ Vin V DD V TN V DD-|V TP2 | M 2 off M 1 o f f M 2 sat M 1 sat M 1 triode M 2 M 1 V in1 V in1-V TN <V out1 < V DD-|V TP2 | Output swing is reduced by V TP2 . 10 WLCHEN CS amplifier with diode-connected load ) (1 g g r g v v ) (1 g 1 g g g g 1 ~ ) (r || r r r m2 m1 out m1 in out m2 ds2 mb2 m2 ds1 2 ds1 out in + = + + + + = = ~ ~ v out v in V DD r in r out r 2 Body effect ! 11 WLCHEN CS amplifier with current source D 2 1 ox n ds2 ds1 m1 out m in out ds2 ds1 out in I...
View Full Document

Page1 / 43

03_Single_Stage_Amp - 1 WLCHEN EE6326 Analog IC Design Fall...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online