Small Signal Amplifier tasks

1 task

VCC = 14V
VBE = 0,7V
R1 = 10kΩ
R2 = 5kΩ
RC = 1kΩ
RE = 1kΩ
RLOAD = 1kΩ
Rg = 50Ω
β = 200
gce = 2 ∗ 10 −5 S

C1 = 10μF
C2 = 47μF
CE = 4,7μF
rbb’ = 10Ω
Cb’e = 20pF
Cb’c = 3pF

IC = ?
gm = ?
VCE = ?
Rin = ?
Rout = ?
AV = ?
AVeff = ?
τ1 = ?
f1 = ?
τ2 = ?
f2 = ?
τ’E = ?
f’E = ?
τE = ?
fE = ?

Small Signal Amplifier Formulas:

Medium frequencies:

Low frequencies:

Scheme for obtaining Time Constant of the Coupling Capacitance C 1 :

Scheme for obtaining Time Constant of the Coupling Capacitance C 2 :

High frequencies – Scheme for obtaining Time Constant of the Blocking Capacitance C E :

Logarithmic Amplitude Characteristic of the Amplifier:

2 task

Common Drain (CD) JFET Amplifier

EDD = 30V (+)
R = 100kΩ
RS = 1kΩ
Rg = 600Ω
RLOAD = 5kΩ
gm = 3mS

C1 = 0,1μF
C2 = 0,1μF
Cgs = 7pF
Cgd = 7pF

Rin = ?
Rout = ?
AV = ?
AVeff = ?

τ1 = ?
f1 = ?
τ2 = ?
f2 = ?
τup = ?
fup = ?

Small Signal Amplifier Formulas:

Medium frequencies:

Low frequencies:

Scheme for obtaining Time Constant of the Coupling Capacitance C 1:

Scheme for obtaining Time Constant of the Coupling Capacitance C2:

High frequencies – Scheme for obtaining Time Constant of the Input Capacitance Cin:

Logarithmic Amplitude Characteristic of the Amplifier:

3 task

Common Emitter (CE) BJT Amplifier

VCC = 10V
VBE = 0,7V
RC = 1kΩ
RLOAD = 5kΩ
Rg = 833Ω
I = IB = 30μA
β = 200

C1 = 95,5nF
C2 = 1,59μF
Cb’e = 31pF
Cb’c = 0,8pF
rbb’ << R g

IC = ?
gm = ?
VCE = ?
Rin = ?
Rout = ?
AV = ?
AVeff = ?

τ1 = ?
f1 = ?
τ2 = ?
f2 = ?
τup = ?
fup = ?

Small Signal Amplifier Formulas:

Medium frequencies:

Low frequencies:

Scheme for obtaining Time Constant of the Coupling Capacitance C1:

Scheme for obtaining Time Constant of the Coupling Capacitance C2:

High frequencies – Scheme for obtaining Time Constant of the Blocking Capacitance CE:

4 task

Common Emitter (CE) BJT Amplifier

VCC = 14V
VBE = 0,7V
R1 = 10kΩ
R2 = 5kΩ
RC = 1kΩ
RE = 1kΩ
RLOAD = 1kΩ
Rg = 50Ω
β = 200
gce = 10 −4 S

VC1 = ?
VC2 = ?
VCE = ?
IC = ?
gm = ?
VCE = ?
Rin = ?
Rout = ?
AV = ?
AVeff = ?

Small Signal Amplifier Formulas:

Hybrid π model of the BJT Amplifier in CE configuration:

5 task

Common Emitter (CE) BJT Amplifier

VCC = 15V
VEE = -15V
VBE = 0,7V
R2 = 47kΩ
RC = 2,7kΩ
RE = 3,3kΩ
RLOAD = 2,2kΩ
Rg = 50Ω
IC = 4mA
β = 200
gce = 10−4 S

VC1 = ?
VC2 = ?
VCE = ?
gm = ?
VCE = ?
Rin = ?
Rout = ?
AV = ?
AVeff = ?

Small Signal Amplifier Formulas:

Hybrid π model of the BJT Amplifier in CE configuration:

6 task

Common Emitter (CE) BJT Amplifier

VCC = 20V
VBE = 0,7V
RC = 4kΩ
RB = 772kΩ
RLOAD = 4kΩ
Rg = 600Ω
rb’e = 1kΩ
gm = 160mS

β = ?
IC = ?
VCE = ?
Rin = ?
Rout = ?
AV = ?
AVeff = ?

Small Signal Amplifier Formulas:

Hybrid π model of the BJT Amplifier in CE configuration:

7 task

E = 18,7V
VA = 100V
VBE = 0,7V
VZ = 5,6V
|VT|= 4,7V (+)
RC = 5kΩ
RE = 2,45kΩ
RD = 1kΩ
R = 18kΩ
rds = 0
mA
K = 0,5 mA/V^2

IC = ?
VGS = ?
ID = ?
VDS = ?
gm = ?
Rin = ?
Rout = ?
AV = ?

Small Signal Amplifier Formulas:

Hybrid π model of the Amplifier:

8 task

Common Emitter (CE) BJT Amplifier

VCC = 20V
VBB = 41V
VBE = 0,7V
RC1 = 1kΩ
RC2 = 1kΩ
RB = 2MΩ
RLOAD = 2,2kΩ
Rg = 50Ω
β = 200
gce = 10 -4 S

IC = ?
gm = ?
VCE = ?
Rin = ?
Rout = ?
AV = ?
AVeff = ?

Small Signal Amplifier Formulas:

Hybrid π model of the BJT Amplifier in CE configuration:

9 task

Common Emitter (CE) BJT Amplifier

VCC = 21V
VBE = 0,7V
RC = 1,2kΩ
R1 = 20kΩ
R2 = 10kΩ
RE1 = 160Ω
RE2 = 1,4kΩ
RLOAD = 4,7kΩ
Rg = 50Ω
β = 200

IC = ?
gm = ?
VCE = ?
Rin = ?
Rout = ?
AV = ?
AVeff = ?

Small Signal Amplifier Formulas:

Hybrid π model of the BJT Amplifier in CE configuration:

10 task

Common Base (CB) BJT Amplifier

VCC = 20V
VBE = 0,7V
RC = 1,2kΩ
R1 = 565kΩ
RE = 2kΩ
RLOAD = 2,2kΩ
Rg = 50Ω
β = 200

IC = ?
gm = ?
VCE = ?
Rin = ?
Rout = ?
AV = ?
AVeff = ?

Small Signal Amplifier Formulas:

Hybrid π model of the BJT Amplifier in CB configuration:

11 task

Common Source (CS) JFET Amplifier

EDD = 30V (+)
|VT|= 4V (-)
C3 = 3V
RD = 5kΩ
RS = 1kΩ
R2 = 100kΩ
Rg = 10kΩ
RLOAD = 20kΩ

ID = ?
VGS = ?
IDSS = ?
gm = ?
Rin = ?
Rout = ?
AV = ?
AVeff = ?

Small Signal Amplifier Formulas:

Hybrid π model of the JFET Amplifier in CS configuration: