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APPLICATIONS
4 . M e a s u r e m e n t o f noise ( F i g . 6 )
If t h e noise indeces o f A a n d B are expressed b y F j a n d
F
r e s p e c t i v e l y , t h e a m o u n t o f a t t e n u a t i o n is expressed
3
b y L
a n d t h e gain Gi o f A is s u f f i c i e n t l y large,
2 /
F j •=
~
R
t
l
L
2
F
t
2
L
a
L
" -
L
'
2
2
F t j a n d F t
are F t (overall noise f i g u r e ) w h e r e L
2
a n d
L
"
2
M e a s u r e m e n t o f noise s h o u l d b e p e r f o r m e d a f t e r c h e c k -
i n g t h e c i r c u i t s y s t e m .
Signal generator
Amplifier
or
under test
noise generator
10
'
( F
» - )
1
G
is L
2
Variable
attenuator
RA-920
F i g . 6
'
2
Auxiliary
AC voltmeter
amplifier
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