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CYU 101 CYU 102 = 224 (a) IBQ = 1996 A, ICQ = 1796 mA, VCEQ = 777 V (b) IBQ = 1646 A, ICQ = 1975 mA, VCEQ = 7065 V
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CYU 103 CYU 104
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CYU 105 CYU 106 CYU 107 CYU 108 CYU 109 CYU 1010 CYU 1013 CYU 1014
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Design A: VCEQ = 173 V, ICQ = 425 mA Design B: VCER = 037 V, ICQ = 099 mA For = min : IBQ = 254 A, ICQ = 152 mA, VCEQ = 887 V For = max : IBQ = 112 A, ICQ = 22 mA, VCEQ = 601 V For IC = 10 mA: RB = 12 k , R1 = 614 k , R2 = 149 k (a) 145; (b) 98; (c) 1025 The ampli er behaves more closely to the ideal model if the source resistance is small and the load resistance is large (a) 105; (b) 71; (c) 105 AV = 5139; AI = 3417 IDQ = 032, 072, 128, 2, 288, 392, 512 mA; gm = 16, 24, 32, 4, 48, 56, 64 mA/V = 103; AV = 936 = 016, 024, 032, 04, 048, 056, 064 AV = 0146, 0218, 0291, 0364, 0436, 0509, 0582 625
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Section 1: Bipolar Transistor Ampli ers 101 The circuit shown in Figure P101 is a simpli ed
common-base circuit a Determine the operating point of the transistor circuit b Draw the h-parameter model for this circuit
= 150
+ v (t) S _
c If hoe = 10 5 S and hf e = , determine the voltage gain as de ned by vout /vin d Find the input resistance, ri e Find the output resistance, ro
103 The transistor shown in the ampli er circuit in
Figure P103 has hie = 13 k , hf e = 90, and hoe = 120 S Find the voltage gain
RC _ vout (t) + 15 V _ Q VCC 33 k 47 k
+ _ 5 V RE = 200 RC = 400
Figure P101
+ _
102 Consider a common-emitter ampli er circuit with
the following parameter values (see Figure 107): VCC = 10 V, R1 = 3000 , R2 = 3000 , RS = 50 RC = RE = 100 , RL = 150 , = 100 a Find the operating point of the transistor b Draw the AC equivalent circuit of the ampli er ,
Figure P103
104 The circuit shown in Figure P104 is a variation of
the common-base ampli er
10
Transistor Ampli ers and Switches
a b c d e
Find the Q point of the transistor Draw the AC equivalent circuit, using h parameters Find the voltage gain vL /vin Find the input resistance, ri Find the output resistance, ro
Rin RE iE + VL iC iL RL _
d Find the input resistance, ri e Find the output resistance, ro
VCC R1 ri RS + Cb + R2 RE iout vout _ iin RC
= 250 = hfe
+ vin _ CB
vin _
Source Amplifier RE = 50 RL = 100 = 75 = hfe VCC = 10 V RB1 = 513 RB2 = 2730
RE = 250 R1 = 9221 VCC = 15 V CB = R2 = 6320
Figure P106
Figure P104
107 The circuit that supplies energy to an automobile s
fuel injector is shown in Figure P107(a) The internal circuitry of the injector can be modeled as shown in Figure P107(b) The injector will inject gasoline into the intake manifold when Iinj 01 A The voltage Vsignal is a pulse train whose shape is as shown in Figure P107(c) If the engine is cold and under start-up conditions, the signal duration, , is determined by the equation = BIT KC + VCIT where
+ 15 V RC C
105 For the circuit shown in Figure P105, vS is a small
sine wave signal with average value of 3 V If = 100 and RB = 60 k , a Find the value of RE so that IE is 1 mA b Find RC so that VC is 5 V c For RL = 5 k , nd the small-signal equivalent circuit of the ampli er d Find the voltage gain
BIT = Basic injection time = 1 ms KC = Compensation constant of temperature of coolant (TC ) VCIT = Voltage-compensated injection time The characteristics of VCIT and KC are shown in Figure P107(d)
Vbatt Vsignal + Vinj _ Injector
= 100
+ _
C= RE
Figure P105
collector con guration Using Table 102 and assuming RC = 200 : a Find the operating point of the transistor b Draw the AC equivalent circuit for hoe = 10 4 S c If the voltage gain is de ned as vout /vin , nd the voltage gain If the current gain is de ned as iout / iin , nd the current gain
Cylinder (a)
106 The circuit in Figure P106 is in a common-
80
Q1 = 40
Intake manifold Valve
Spark plug
Figure P107
Part II
Electronics
Iinj
Iinj + Vinj _ Vinj
10
1 mH
dissipate 05 W when VR = 10 V If RE = 40 , RB = 450 , RS = 20 , L = 100 mH, Rw1 = Rw2 = 100 , VCE sat = 03 V, V = 075 V, and VS (t) is a square wave that ranges from 0 volts to 48 volts and has a maximum current of 20 mA a Determine the maximum power dissipated by this circuit b Determine the time it takes for the relay to switch from the closed to the open position if VS has been at 48 V for a very long time
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