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Common-Base Amplifier: Calculating Voltage Gain and Resistances - Prof. William Leach, Study notes of Electrical and Electronics Engineering

Georgia Institute of Technology - Main CampusElectrical and Electronics Engineering
Prof. William Leach

The calculations for the voltage gain and resistances in a common-base amplifier circuit. It includes values for various resistors, voltages, and constants. The document also includes calculations for dc bias, ac signal, and approximate solutions.

Typology: Study notes

Pre 2010

Uploaded on 08/05/2009

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Common-Base Amplifier Example
RPxy
,
()xy
.
xy Function for calculating parallel resistors.
R1100000 R 2120000 R C4300 R E5600 R S100 R L10000
Vplus 15 V minus 15 V BE 0.65 V T0.025
β
99
α
0.99
rx20 r 050000
vs1With vs = 1, the voltage gain is equal to vo.
1
pf3
pf4
pf5

Partial preview of the text

Download Common-Base Amplifier: Calculating Voltage Gain and Resistances - Prof. William Leach and more Study notes Electrical and Electronics Engineering in PDF only on Docsity!

Common-Base Amplifier Example

R

P

( x y, )

x y

x y

Function for calculating parallel resistors.

R

100000 R

120000 R

C

4300 R

E

5600 R

S

100 R

L

V

plus

15 V

minus

15 V

BE

0.65 V

T

0.025 β 99 α 0.

r x

20 r 0

v s

1 With v s

= 1, the voltage gain is equal to v o

DC Bias Circuit

V

BB

V

plus

R

V

minus

R

R

R

V

BB

R

BB

R

P

R

R

, R

BB

I

E

V

BB

V

BE

V

minus

R

BB

1 β

R

E

I

E

r e

V

T

I

E

r e

Test for Active Mode

V

C

V

plus

α I E

R

C

V

C

V

B

V

minus

I

E

R

E

V

BE

V

B

V

CB

V

C

V

B

V

CB

= 4.146 Thus active mode.

Circuit for v o

R

tc

R

P

R

C

R

L

, R

tc

r ic

r 0

R

P

r' e

R

te

α R te

r' e

R

te

r ic

i csc

v te

R

te

R

P

r' e

r 0

α r 0

r' e

r 0

r' e

i csc

v o

i csc

R

P

R

tc

r ic

v o

= 26.862 This is the voltage gain.

Circuit for r out

r out

R

P

R

C

r ic

, r out

Circuit for r in

r ie

r' e

r 0

R

tc

r' e

r 0

R

tc

1 β

r ie

Approximate solution 2 using the equation i c

α i e

and neglecting r x

and r 0

A

v

R

E

R

S

R

E

α R P

R

C

R

L

r ie

R

te

A

v

r in

R

P

R

E

r ie

, r in

r out

R

C

r out