Lecture11-12

# Lecture11-12 - re 623 npn E Veb B Ie Ic C Zi = dVeb dI e I EQ(1 Vcb B Zi = re = 26mV resistance looking into the emitter IEQ re Ie Ic C E Vbe re =

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Unformatted text preview: re 623 ( npn ) E Veb B Ie Ic C Zi = dVeb dI e I EQ (1 Vcb B ) : ( Zi = re = 26mV resistance looking into the emitter IEQ re Ie Ic C + E + Vbe re = B Ic= Ie B ) Zi .( IEQ . 50 dV Z = cb o dI c I (2 CQ Z o :( ) Ic v.s. VCB . 2 M 1 M Zo Av (3 Ii Ie + Vi=Veb B Ic= Ie B Io Ic AV = C + RL I e RL RL -I R Vo V = cb = c L = = Vi - Vbe - I e re I e re re E AV Vo=Vcb Ai (4 Ai = I Io I = c = e = - - 1 Ii - Ie - Ie : . : Ic Ib B + + C ( npn ) dVbe Zi = dI b Zi = I BQ (1 Vbe E - Vce E dVbe dI e dVbe = dI e dI b dI e re Ic +C Ib B + Vbe Ic= Ib Vce Ie Ib E dV be dI e ( ) re : Z i = re Resistance looking into the base Zi . 67 k E- Ic(mA) IB4 Slope = c = 1 dV r ce o dI dVce (2 ro = Z o = dI c ) Icv.s. Vce ( ) .... .( rc Ic= o . 4050 k ro . VCE Sat IB2 IB1 IB=0 VCE V I c = I b + ce : ro Ib Ic + + C B Vbe r e E Ic Ib B E + Vbe Ic= Ib Ie +C Vce - E RL Ib ro Vce -E AV (3 ( re IC ) Z0 ~ Av = V0 Vce - I c RL R = = =- L Vi Vbe I e re re I0 Ic Ib = = Ii Ib Ib Ai (4 Ai = Bypass 7-2-3 Xc Iac AC . DC B Rs Vs + - A RL . ac I ac = V s ac R2 + X 2 c - : ac Xc=1/c R=Rs+RL rms Vs ac Iac . min : X c (min ) = 1 min C 0.1R C 1 X c ( min) 0.1R 0.1min ( Rs + RL ) min ac %99 : Vsac Vsac I ac = R + (0.1R ) 2 2 = 0.995 R { ac ) ac Xc(min) =R/10 dc . ( min . - dc ac Bypass : bypass V th ac = 2 R th + X c2 . Xc=1/c rms Vth ac Iac ( ) min Rth Vout X c (min ) = 0.1Rth Vth + Iac C - I ac I ac min Vth ac Vth ac = = 0.995 2 2 Rth Rth + (0.1Rth ) - min ac %99 V th ac V = I X = (0.995 )(0.1R ) th out ac ac c R th V 0.1V out ac th ac Vout ac rms xc , min : =10 min V 0.01V out ac th ac - min Xc(min)=0.1 Rth . - ( ) : bypass ( Av ,Zout, Zin ) 7-2-3 BE I EQ . VBE . VBEQ V BE . I EQ IE B A Q . %10 ) . I IE IEQ=10mA A ( 1 mA I Q 623 B V : V 26 mA E EQ BE BEQ .1 - re = I EQ ) VCB . (223 )(IC) IB (123 . 0.5W . . LED ) (... , , ) ( ( : ) - - (Common-Emitter) CE 2 :C E bypass Vcc RC C C1 R2 B E RE CE Ic C2 Vo ( - ac , XC (min) 0.1 R . : XCi (min) 0.1 Rth i R1 Ii Vi .( i Rth i i XC i ) R1 RC dc dc Vo . ) Vi . ( ) Vo Ib B C Ic I oz - Vi R2 - Ii + Vi R1 R2 + Ib Ro IRc Rc Vo - re E E ) (623 : - for Ic0 dV ce = 1 dI c slope of Ic v.s. VCE curves Ii + Vi R1 R2 Ib B C re E E Ib Ic I oz + Ro IRc Rc Vo - RR R12 = R1 || R2 = 1 2 R1 + R2 : / Vi = R12 || re Ii Input impedance = Zi = in Ib = 0 V =0 Vi re Output impedance = Zo = Voltage gain = A VNL = VO = RC || Ro RC if RC <<ro IOZ vin = 0 Vo - IRC RC - Ic RC - Ib RC R = = = =- C Vi Vi Vi Vi re I c = I b + 0 if ro = Vce V = I b + o ro ro Ii + Vi R1 R2 Ib re B C Ib E Ic Ro I oz + Vo IRc Rc - E . Vo Vi 180 AVNL : ro : ( ) AVNL Vo - Ib (Ro || Rc ) - Ro || Rc A VNL = = = Vi Ib ( re ) re Vi re : ( )AVNL AVNL Vo - I B + RC ro Vo I c RC = - RC - Vo RC A = - RC || ro =- = A VNL = VNL Vi Vi Vi re Vi ro re re = ( IEQ )Ie Ie . re 298 K re = 26mv AVNL IE . AVNL 26 mv IE 2:1 ) AVNL re .( . (63 K ) RC (1530 ) re . 400 100 : CE Bypass ac CE : Ii R1 Ib B C re R1 R2 RE Ib E Ie= Ib ro Ic + Rc Vo - RC Vo + Vi Vi R2 RE - : ( r0 = ) ro Vb = re I b + RE I e = (re + RE ) I b : Ii + Vi R1||R2 (re+RE) Ib IRC RC Ib IoA Ic Ioz + Vo - Zo AVNL RE Ii + Vi R1||R2 - Ib Ic Ioz + or if we define Ai as : Ai = I OZ Ii (re+RE) Ib IRC RC Vo - Ai = AVNL Zi R R12 || (re + RE ) =- C RL re + RE RL RL : input impedance of the load Z i = R12 || (re + RE ) "" Zi "" Zo Vi (re + RE ) : Zo = Vo V |Vi =0 = o |I b=0 = Rc I oz I oz AVNL = Vi R (re + RE ) I b (re + RE ) I Z I .... Ai = c = - AVNL i = 12 or Ai = c = = Vi Vi Ii Rc re + RE Ii R12 (re + RE ) R12 (re + RE ) Vo - I RC RC - I cRc - I b Rc - Rc R = = = = - c Vi Vi Vi Vi re + RE RE ( re+RE) r e AVNL RE >> re . "" . re AVNL Vi ) CE :( RL VCC RC C C2 E CE R1 Rs Vs + Vin C1 R2 B RE Vout RL Rs Vin Vs + Zi Zo + AVNL.Vin - Vout Io ) () () RL (R = R =0 L s ) : ( Rs Vin Vs + Zi Zo + AVNL.Vin - Vout RL Io . () () AVNL Zo Zi : Vs Zi Vin = Zi = Vs Rs + Z i Rs + Z i AVNL Vin Z o + RL * Vout = RL Vout } io RL = AVNLVin Z o + RL ** : ** * RL Zi Vs AVNL = Rs + Z i Z o + RL (CB) 3 Vin C1 IEQ RE -VEE RB IBQ IC +VCC RC E C C2 Vout dc : } - RE I EQ + VEE = 0 I BQ KVL : - RB I BQ - VBE I BQ = VCE V +V CC EE R +R C E I CSat = I CQ 2 VEE - VBE V - VBE I CQ = I BQ = EE RB RB + RE + RE * IC Sat Q VCE VCEQ (V +V ) CC CE :( ) KVL : VCC - RC I CQ - VCEQ - RE I EQ + VEE = 0 VCEQ + (RC + RE )I CQ = VCC + VEE R R >> B E : Q * I CQ = V + VEE V EE-VBE I Csat = = CC RE 2 2(RC + RE ) V - VEE + 2VBE RC = RE CC 2V - 2V EE BE ** VEE>>VBE~0.7 rE >> RB / * . * RE ICQ ICQ VBE ) Q . RC ** ( Q ( CB 3.58 ) ac Ii + Vi IRE RE Ie E re B C Ie Ic Ioz + IRc Rc Vo - Z in = RE || re re Z out = Vo I oz = Vin = 0 Vo I oz = Rc ( = RC ac ) ie = 0 AVNL = C Vo - RC I RC RC I c RC I e RC RC ac = = = = Vi re I e re I e re re - re I e I Ic I Ie Ai = c = c = = - -1 I i - I e - I RE - I e - I e Rc1 Rc2 Rc ac Rc dc AVNL Zout Rc . Bypass RC dc = RC1 + RC 2 RC ac = RC1 ( Emitter-Follower ) (cc) 4 +Vcc Vin Vin 1 Vin 2 B C Vout Ie RE E Vout 1 Vout 2 : 0.7 Vout Vin0 . Vin<0 I e = 0 VE = 0 : Vcc R1 C Vin R2 B E RE Vout Rth = R1 R2 R2 Vth = Vcc R1 + R2 R1 + R2 Vth Rth Vin Vin Vcc IB B IE C E RE Vout Vth-VBE VE Vin Vth Rth Vin Vcc IB B IE dc : rb I B C E RE Vout KVL : Vth - Rth I B - VBE - RE I E = 0 V th IB = Rth + rb + RE IC = I B = IB || Vth Vth Rth rb Rth + + RE + RE ( ) ICQ RE>10Rth/min . :(dc ) KVL : Vcc - VCE - RE { = 0 VCE + RE I C = VCC IE IC VCEQ ICQ : IC V cc = I CQ 2 RE V = cc 2 VCC VCE VCC RE IC Sat VCE + RE I C = VCC : dc Q 1 Vth = Vcc 2 : RE>>Rth/ VCEQ I CQ = VCEQ V = CC 2 Vth Rth +RE Vth VCC = RE 2 RE : ICQ IC Sat VCE Cut VCEQ ICQ . dc Q .( ) ac RE>10Rth/min RE . Rth Vin C B E RE Vout ac ac : . Vb (re + RE ) I e = (re + RE ) I b Z B = (re + RE ) * ( ) Z in = Rth || Z B Ii + re Vi Rth IRth E Ie RE Ib Ic= Ib B IoA Ioz + Vo _ : * Vo = RE I e Vi = VB = ( RE + re ) I e : Vo = RE I e Vi = VB = ( RE + re ) I e IoA + Vi Zin Vi + re Ie Ioz + RE Vo - : : V z = o o I oz = RE re re Vin =VB = 0 : Emitter-Follower 1 Av = Vo RE I e RE = = 1 if RE >> re Vi (RE + re )I e RE + re Ic=B Ib Ii + rb Vi Rth E RE Ie Ib B IoA Io : R Z Vi = th B I Rth I Z in = Rth || Z E i Rth + Z B B = + I i Rth + Z B V = Z I B B Vo i _ I I Rth IB Ai = OA = - e = - = - Ii Ii Ii Rth + Z B 823 AC , dc ) dc ac , ac .( ac , dc ac dc : Vcc R1 Ii Vi R2 RC C E RE Ic Vo , CE bypass . KVL :( , ) dc CE Ie KVL : VCC RC IC VCE RE IC = 0 VCE + (RC + RE) IC = VCC ( dc ) :( dc ) ac KVL : - RC iC - vCE = 0 vCE = -RC iC (ac ) IC lC ac ac . Q (iC, vCE) . Q 1/Rc VCC RC + R E Q I CQ - 1 RC : ac (iC, vCE) vCE VCC VCE VCEQ iC= IC ICQ vCE= VCE VCEQ ( dc ) IC VCE ac : ,(vCE = -RC.iC) ac : V I C = I CQ + CEQ - CE R R C C V ac : IC I CQ + V CEQ RC ac - load lins CEQ csot = I CQ + R C I =0 C V CE cut = VCEQ + RC I CQ =0 CE I V V VCC RC + RE I CQ Q dc - load line VCEQ (VCEQ + RC ICQ ) VCC VCE Q VCE , iC ac ) ac IC VCE ( ac . ac RC ICQ (cut off ) Q VCE ) . VCEQ ( ) Q ( .( dc ) ac Q , ac ) ac Q . ( ac Q (RC ICQ ) Q (VCEQ) Q , VCEQ = RC.ICQ I CQ = VCEQ RC IC I CQ + V CEQ RC ac - load lins VCC RC + RE I CQ Q dc - load line VCEQ (VCEQ + RC ICQ ) VCC VCE 1/RC Q VCEQ ICQ , dc . VCEQ ICQ Q IC VCC RC + R E slop = Q 1 RC I CQ VCEQ 2VCEQ VCC VCE dc VCEQ = RC . ICQ Q : I CQ = VCEQ VCC 2 RC + RE C CC C E R = (2 R V R + ) VO VCC dc 36 0 A .2 . 360 o t , , %25 (VCC/2 ) ( %50 , ) ) %10 ( VCEQ ICQ (Ai , Av) , . Pout v out iout AP = = = Av . Ai Pin v in iin . AP , Ai Av RL dc ac , . P L (ac) PL (ac) = ac Load Power % = : P S (dc) PS (dc) = dc input Power 2 V Lrms VL rms = ac rms voltage across RL : P L (ac) = R RL = Load resis tan ce VCC = dc Supply Voltage Ps = VCC I S dc : I S dc = dc Current Supplied by VCC L ...
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## This note was uploaded on 02/08/2010 for the course MECHANICAL 6371 taught by Professor Ha during the Winter '10 term at Concordia Canada.

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