D If F E R E N T I A T I N G N E T W O R K - Siemens 100-8D Technical Manual

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READ CIRCUIT
1E
READ
DATA
1 2
F i g u r e 3 - 3 2 .
T h e f i l t e r h a s a - 3 d b b a n d w i d t h o f 8 0 0 k i l o h e r t z .
t h e o u t p u t v o l t a g e to c o n s t r a i n t h e b u f f e r a m p l i f i e r w i t h i n i t s l i n e a r r a n g e .

D if f e r e n t i a t i n g N e t w o r k

T h e d i f f e r e n t i a t i n g n e t w o r k ( F i g u r e 3 - 3 3 ) p r o v i d e s a 9 0 - d e g r e e d e l a y to c o n v e r t
t h e I n c o m i n g r e a d d a t a s i g n a l p e a k s to d i s t o r t e d z e r o c r o s s i n g s f o r t h e c r o s s o v e r
d e t e c t o r ( s e e F i g u r e 3 - 3 4 ) .
s e r i e s c i r c u i t , r e s o n a n t a t 7 50 k i l o h e r t z .
R e s i s t o r s R 9 0 a n d R 9 1 , a n d p o t e n t i o m e t e r R 1 0 0 p r o v i d e a d c o f f s e t a d j u s t m e n t .
C31
R99
H f -
- W r
C30
C29
M V
I t
R98
C28
TPB3
R e a d P r e a m p l i f i e r a n d F i l t e r C i r c u i t
C a p a c i t o r C 3 6 , I n d u c t o r L 2 a n d r e s i s t o r R9 5 f o r m a
F i g u r e 3 - 3 3 .
D i f f e r e n t i a t i n g N e t w o r k
3 - 3 4
F IL T E R NETWORK
R97
L4
C37
C34
—V v V
L3
R96
R e s i s t o r s R 9 4 , 9 6 a n d 97 d i v i d e
D i f f e r e n t i a t o r d a m p i n g i s b y r e s i s t o r R95,
'
f t
TO
R94
k ACT
DIFF

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